LM2575HVS-15/NOPB [TI]

LM1575/LM2575/LM2575HV SIMPLE SWITCHER 1A Step-Down Voltage Regulator; LM1575 / LM2575 / LM2575HV SIMPLE SWITCHER 1A降压型稳压器


型号：	LM2575HVS-15/NOPB
厂家：	TEXAS INSTRUMENTS
描述：	LM1575/LM2575/LM2575HV SIMPLE SWITCHER 1A Step-Down Voltage Regulator LM1575 / LM2575 / LM2575HV SIMPLE SWITCHER 1A降压型稳压器稳压器开关
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LM1575, LM2575-N, LM2575HV

www.ti.com

SNVS106E –MAY 1999–REVISED APRIL 2013

LM1575/LM2575/LM2575HV SIMPLE SWITCHER 1A Step-Down Voltage Regulator

Check for Samples: LM1575, LM2575-N, LM2575HV

FEATURES

DESCRIPTION

The LM2575 series of regulators are monolithic

integrated circuits that provide all the active functions

for a step-down (buck) switching regulator, capable of

driving a 1A load with excellent line and load

regulation. These devices are available in fixed output

voltages of 3.3V, 5V, 12V, 15V, and an adjustable

output version.

•

3.3V, 5V, 12V, 15V, and Adjustable Output

Versions

•

Adjustable Version Output Voltage Range,

–

1.23V to 37V (57V for HV Version) ±4%

Max Over

–

Line and Load Conditions

Requiring

minimum number of external

•

Specified 1A Output Current

components, these regulators are simple to use and

include internal frequency compensation and a fixed-

frequency oscillator.

Wide Input Voltage Range, 40V up to 60V for

HV Version

•

Requires Only 4 External Components

The LM2575 series offers

high-efficiency

52 kHz Fixed Frequency Internal Oscillator

replacement for popular three-terminal linear

regulators. It substantially reduces the size of the

heat sink, and in many cases no heat sink is

required.

TTL Shutdown Capability, Low Power Standby

Mode

•

High Efficiency

A standard series of inductors optimized for use with

the LM2575 are available from several different

manufacturers. This feature greatly simplifies the

design of switch-mode power supplies.

Uses Readily Available Standard Inductors

Thermal Shutdown and Current Limit

Protection

P⁺Product Enhancement Tested

•

Other features include a specified ±4% tolerance on

output voltage within specified input voltages and

output load conditions, and ±10% on the oscillator

frequency. External shutdown is included, featuring

50 μA (typical) standby current. The output switch

includes cycle-by-cycle current limiting, as well as

thermal shutdown for full protection under fault

conditions.

APPLICATIONS

•

Simple High-Efficiency Step-Down (Buck)

Regulator

•

Efficient Pre-Regulator for Linear Regulators

On-Card Switching Regulators

Positive to Negative Converter (Buck-Boost)

Typical Application

(Fixed Output Voltage Versions)

Pin numbers are for the TO-220 package.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

SIMPLE SWITCHER is a registered trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

LM1575, LM2575-N, LM2575HV

SNVS106E –MAY 1999–REVISED APRIL 2013

www.ti.com

Block Diagram and Typical Application

3.3V, R2 = 1.7k

5V, R2 = 3.1k

12V, R2 = 8.84k

15V, R2 = 11.3k

For ADJ. Version

R1 = Open, R2 = 0Ω

Pin numbers are for the TO-220 package.

Figure 1.

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SNVS106E –MAY 1999–REVISED APRIL 2013

Connection Diagrams

(XX indicates output voltage option.)

Top View

Side View

Figure 2. Straight Leads

5-Lead TO-220 Package

LM2575T-XX or LM2575HVT-XX

See Package Number KC0005A

Figure 3. Bent, Staggered Leads Figure 4. LM2575T-XX Flow LB03

5-Lead TO-220 Package

LM2575HVT-XX Flow LB03

See Package Number NDH0005D

Top View

*No Internal Connection

Figure 5. 16-Lead CDIP and PDIP Packages

LM2575N-XX or LM2575HVN-XX

LM1575J-XX-QML

Figure 6. 24-Lead Surface Mount SOIC Package

LM2575M-XX or LM2575HVM-XX

See Package Number DW0024B

See Package Numbers NFE0016A and NBG

Top View

Figure 7. DDPAK/TO-263 Package

5-Lead Surface-Mount Package

See Package Number KTT0005B

Side View

Figure 8. LM2575S-XX or LM2575HVS-XX

See Package Number KTT0005B

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SNVS106E –MAY 1999–REVISED APRIL 2013

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These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

(1)(2)(3)

ABSOLUTE MAXIMUM RATINGS

Maximum Supply Voltage

LM1575/LM2575

LM2575HV

45V

63V

ON /OFF Pin Input Voltage

Output Voltage to Ground

Power Dissipation

−0.3V ≤ V ≤ +V_IN

−1V

(Steady State)

Internally Limited

−65°C to +150°C

150°C

Storage Temperature Range

Maximum Junction Temperature

Minimum ESD Rating

(C = 100 pF, R = 1.5 kΩ)

2 kV

Lead Temperature

(Soldering, 10 sec.)

260°C

(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for

which the device is intended to be functional, but do not ensure specific performance limits. For specified specifications and test

conditions, see Electrical Characteristics.

(2) If Military/Aerospace specified devices are required, please contact the TI Sales Office/ Distributors for availability and specifications.

(3) Refer to RETS LM1575J for current revision of military RETS/SMD.

OPERATING RATINGS

Temperature Range

LM1575

−55°C ≤ T_J≤ +150°C

LM2575/LM2575HV

LM1575/LM2575

LM2575HV

−40°C ≤ T_J≤ +125°C

Supply Voltage

40V

60V

ELECTRICAL CHARACTERISTICS LM1575-3.3, LM2575-3.3, LM2575HV-3.3

Specifications with standard type face are for T_J= 25°C, and those with boldface type apply over full Operating

Temperature Range .

LM2575-3.3

LM1575-3.3

Units

(Limits)

LM2575HV-3.3

Symbol

Parameter

Conditions

Typ

(1)

(2)

Limit

SYSTEM PARAMETERS Test Circuit Figure 25 and Figure 26⁽³⁾

V_OUT

Output Voltage

V_IN= 12V, I_LOAD= 0.2A

Circuit Figure 25 and Figure 26

3.3

3.267

3.333

3.234

3.366

V(Min)

V(Max)

Output Voltage

LM1575/LM2575

4.75V ≤ V_IN≤ 40V, 0.2A ≤ I_LOAD≤ 1A

Circuit Figure 25 and Figure 26

3.3

3.200/3.168

3.400/3.432

3.168/3.135

3.432/3.465

V(Min)

V(Max)

Output Voltage

LM2575HV

4.75V ≤ V_IN≤ 60V, 0.2A ≤ I_LOAD≤ 1A

Circuit Figure 25 and Figure 26

3.200/3.168

3.416/3.450

3.168/3.135

3.450/3.482

V(Min)

V(Max)

Efficiency

V_IN= 12V, I_LOAD= 1A

(1) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All limits are used to

calculate Average Outgoing Quality Level, and all are 100% production tested.

(2) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits

are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control

(SQC) methods.

(3) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.

When the LM1575/LM2575 is used as shown in the test circuit Figure 25 and Figure 26, system performance will be as shown in system

parameters of Electrical Characteristics.

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SNVS106E –MAY 1999–REVISED APRIL 2013

ELECTRICAL CHARACTERISTICS LM1575-5.0, LM2575-5.0, LM2575HV-5.0

Specifications with standard type face are for T_J= 25°C, and those with boldface type apply over full Operating

Temperature Range.

LM2575-5.0

LM1575-5.0

Units

(Limits)

LM2575HV-5.0

Symbol

Parameter

Conditions

Typ

(1)

(2)

Limit

SYSTEM PARAMETERS Test Circuit Figure 25 and Figure 26⁽³⁾

V_OUT

Output Voltage

V_IN= 12V, I_LOAD= 0.2A

Circuit Figure 25 and Figure 26

5.0

4.950

4.900

5.100

V(Min)

V(Max)

5.050

Output Voltage

LM1575/LM2575

0.2A ≤ I_LOAD≤ 1A,

8V ≤ V_IN≤ 40V

Circuit Figure 25 and Figure 26

5.0

4.850/4.800

5.150/5.200

4.800/4.750

5.200/5.250

V(Min)

V(Max)

Output Voltage

LM2575HV

0.2A ≤ I_LOAD≤ 1A,

8V ≤ V_IN≤ 60V

Circuit Figure 25 and Figure 26

4.850/4.800

5.175/5.225

4.800/4.750

5.225/5.275

V(Min)

V(Max)

Efficiency

V_IN= 12V, I_LOAD= 1A

(1) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All limits are used to

calculate Average Outgoing Quality Level, and all are 100% production tested.

(2) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits

are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control

(SQC) methods.

(3) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.

When the LM1575/LM2575 is used as shown in the test circuit Figure 25 and Figure 26, system performance will be as shown in system

parameters of Electrical Characteristics.

ELECTRICAL CHARACTERISTICS LM1575-12, LM2575-12, LM2575HV-12

Specifications with standard type face are for T_J= 25°C, and those with boldface type apply over full Operating

Temperature Range .

LM2575-12

LM2575HV-12

LM1575-12

Units

(Limits)

Symbol

Parameter

Conditions

Typ

(1)

(2)

Limit

(3)

SYSTEM PARAMETERS Test Circuit Figure 25 and Figure 26

V_OUT

Output Voltage

V_IN= 25V, I_LOAD= 0.2A

Circuit Figure 25 and Figure 26

11.88

12.12

11.76

12.24

V(Min)

V(Max)

Output Voltage

LM1575/LM2575

0.2A ≤ I_LOAD≤ 1A,

15V ≤ V_IN≤ 40V

Circuit Figure 25 and Figure 26

11.64/11.52

12.36/12.48

11.52/11.40

12.48/12.60

V(Min)

V(Max)

Output Voltage

LM2575HV

0.2A ≤ I_LOAD≤ 1A,

15V ≤ V_IN≤ 60V

Circuit Figure 25 and Figure 26

11.64/11.52

12.42/12.54

11.52/11.40

12.54/12.66

V(Min)

V(Max)

Efficiency

V_IN= 15V, I_LOAD= 1A

(1) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All limits are used to

calculate Average Outgoing Quality Level, and all are 100% production tested.

(2) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits

are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control

(SQC) methods.

(3) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.

When the LM1575/LM2575 is used as shown in the test circuit Figure 25 and Figure 26, system performance will be as shown in system

parameters of Electrical Characteristics.

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SNVS106E –MAY 1999–REVISED APRIL 2013

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ELECTRICAL CHARACTERISTICS LM1575-15, LM2575-15, LM2575HV-15

Specifications with standard type face are for T_J= 25°C, and those with boldface type apply over full Operating

Temperature Range .

LM2575-15

LM1575-15

Units

(Limits)

LM2575HV-15

Parameter

Conditions

Typ

(1)

(2)

Symbol

SYSTEM PARAMETERS Test Circuit Figure 25 and Figure 26⁽³⁾

Limit

V_OUT

Output Voltage

V_IN= 30V, I_LOAD= 0.2A

Circuit Figure 25 and Figure 26

14.85

14.70

15.30

V(Min)

V(Max)

15.15

Output Voltage

LM1575/LM2575

0.2A ≤ I_LOAD≤ 1A,

18V ≤ V_IN≤ 40V

Circuit Figure 25 and Figure 26

14.55/14.40

15.45/15.60

14.40/14.25

15.60/15.75

V(Min)

V(Max)

Output Voltage

LM2575HV

0.2A ≤ I_LOAD≤ 1A,

18V ≤ V_IN≤ 60V

Circuit Figure 25 and Figure 26

14.55/14.40

14.40/14.25

15.68/15.83

V(Min)

V(Max)

15.525/15.675

Efficiency

V_IN= 18V, I_LOAD= 1A

(1) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All limits are used to

calculate Average Outgoing Quality Level, and all are 100% production tested.

(2) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits

are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control

(SQC) methods.

(3) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.

When the LM1575/LM2575 is used as shown in the test circuit Figure 25 and Figure 26, system performance will be as shown in system

parameters of Electrical Characteristics.

ELECTRICAL CHARACTERISTICS LM1575-ADJ, LM2575-ADJ, LM2575HV-ADJ

Specifications with standard type face are for T_J= 25°C, and those with boldface type apply over full Operating

Temperature Range.

LM2575-ADJ

LM2575HV-ADJ

LM1575-ADJ

Units

(Limits)

Symbol

Parameter

Conditions

Typ

(1)

(2)

Limit

SYSTEM PARAMETERS Test Circuit Figure 25 and Figure 26⁽³⁾

V_OUT

Feedback Voltage

V_IN= 12V, I_LOAD= 0.2A

V_OUT= 5V

Circuit Figure 25 and Figure 26

1.230

1.217

1.243

1.217

1.243

V(Min)

V(Max)

Feedback Voltage

LM1575/LM2575

0.2A ≤ I_LOAD≤ 1A,

8V ≤ V_IN≤ 40V

V_OUT= 5V, Circuit Figure 25 and

Figure 26

1.230

1.205/1.193

1.255/1.267

1.193/1.180

1.267/1.280

V(Min)

V(Max)

Feedback Voltage

LM2575HV

0.2A ≤ I_LOAD≤ 1A,

8V ≤ V_IN≤ 60V

V_OUT= 5V, Circuit Figure 25 and

Figure 26

1.205/1.193

1.261/1.273

1.193/1.180

1.273/1.286

V(Min)

V(Max)

Efficiency

V_IN= 12V, I_LOAD= 1A, V_OUT= 5V

(1) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All limits are used to

calculate Average Outgoing Quality Level, and all are 100% production tested.

(2) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits

are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control

(SQC) methods.

(3) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.

When the LM1575/LM2575 is used as shown in the test circuit Figure 25 and Figure 26, system performance will be as shown in system

parameters of Electrical Characteristics.

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SNVS106E –MAY 1999–REVISED APRIL 2013

ELECTRICAL CHARACTERISTICS ALL OUTPUT VOLTAGE VERSIONS

Specifications with standard type face are for T_J= 25°C, and those with boldface type apply over full Operating

Temperature Range. Unless otherwise specified, V_IN= 12V for the 3.3V, 5V, and Adjustable version, V_IN= 25V for the 12V

version, and V_IN= 30V for the 15V version. I_LOAD= 200 mA.

LM2575-XX

LM2575HV-XX

LM1575-XX

Units

(Limits)

Symbol

Parameter

Conditions

Typ

(1)

(2)

Limit

DEVICE PARAMETERS

I_b

Feedback Bias Current

V_OUT= 5V (Adjustable Version Only)

100/500

kHz

(3)

f_O

Oscillator Frequency

See

47/43

58/62

47/42

58/63

kHz(Min)

kHz(Max)

(4)

V_SAT

Saturation Voltage

Max Duty Cycle (ON)

Current Limit

I_OUT= 1A

0.9

1.2/1.4

V(Max)

(5)

See

%(Min)

(4)(3)

I_CL

Peak Current

2.2

1.7/1.3

3.0/3.2

1.7/1.3

3.0/3.2

A(Min)

A(Max)

mA(Max)

I_L

Output Leakage

Current

Output = 0V

Output = −1V

7.5

(6)(7)

mA(Max)

(6)

I_Q

Quiescent Current

See

10/12

mA(Max)

μA

I_STBY

Standby Quiescent

Current

ON /OFF Pin = 5V (OFF)

200/500

200

μA(Max)

(8)

(9)

θ_JA

θ_JC

θ_JA

Thermal Resistance

TO-220 Package, Junction to Ambient

TO-220 Package, Junction to Case

CDIP Package, Junction to Ambient

SOIC Package, Junction to Ambient

100

(10)

°C/W

(10)

DDPAK/TO-263 Package, Junction to Ambient

(11)

(1) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All limits are used to

calculate Average Outgoing Quality Level, and all are 100% production tested.

(2) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits

are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control

(SQC) methods.

(3) The oscillator frequency reduces to approximately 18 kHz in the event of an output short or an overload which causes the regulated

output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average power

dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%.

(4) Output (pin 2) sourcing current. No diode, inductor or capacitor connected to output pin.

(5) Feedback (pin 4) removed from output and connected to 0V.

(6) Feedback (pin 4) removed from output and connected to +12V for the Adjustable, 3.3V, and 5V versions, and +25V for the 12V and 15V

versions, to force the output transistor OFF.

(7) V_IN= 40V (60V for the high voltage version).

(8) Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with ½ inch leads in a

socket, or on a PC board with minimum copper area.

(9) Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with ½ inch leads

soldered to a PC board containing approximately 4 square inches of copper area surrounding the leads.

(10) Junction to ambient thermal resistance with approximately 1 square inch of pc board copper surrounding the leads. Additional copper

area will lower thermal resistance further. See thermal model in Switchers made Simple software.

(11) If the DDPAK/TO-263 package is used, the thermal resistance can be reduced by increasing the PC board copper area thermally

connected to the package: Using 0.5 square inches of copper area, θ_JAis 50°C/W; with 1 square inch of copper area, θ_JAis 37°C/W;

and with 1.6 or more square inches of copper area, θ_JAis 32°C/W.

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ELECTRICAL CHARACTERISTICS ALL OUTPUT VOLTAGE VERSIONS (continued)

Specifications with standard type face are for T_J= 25°C, and those with boldface type apply over full Operating

Temperature Range. Unless otherwise specified, V_IN= 12V for the 3.3V, 5V, and Adjustable version, V_IN= 25V for the 12V

version, and V_IN= 30V for the 15V version. I_LOAD= 200 mA.

LM2575-XX

LM2575HV-XX

LM1575-XX

Units

(Limits)

Symbol

Parameter

Conditions

Typ

(1)

(2)

Limit

ON /OFF CONTROL Test Circuit Figure 25 and Figure 26

V_IH

V_IL

I_IH

ON /OFF Pin Logic

Input Level

V_OUT= 0V

1.4

1.2

2.2/2.4

1.0/0.8

2.2/2.4

1.0/0.8

V(Min)

V(Max)

μA

V_OUT= Nominal Output Voltage

ON /OFF Pin = 5V (OFF)

ON /OFF Pin Input

Current

μA(Max)

μA

I_IL

ON /OFF Pin = 0V (ON)

μA(Max)

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SNVS106E –MAY 1999–REVISED APRIL 2013

TYPICAL PERFORMANCE CHARACTERISTICS

(Circuit Figure 25 and Figure 26)

Normalized Output Voltage

Line Regulation

Figure 9.

Figure 10.

Dropout Voltage

Current Limit

Figure 11.

Figure 12.

Standby

Quiescent Current

Figure 13.

Figure 14.

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TYPICAL PERFORMANCE CHARACTERISTICS (continued)

(Circuit Figure 25 and Figure 26)

Switch Saturation

Voltage

Oscillator Frequency

Figure 15.

Efficiency

Figure 16.

Minimum Operating Voltage

Figure 17.

Figure 18.

Quiescent Current

vs Duty Cycle

Feedback Voltage

vs Duty Cycle

Figure 19.

Figure 20.

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SNVS106E –MAY 1999–REVISED APRIL 2013

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

(Circuit Figure 25 and Figure 26)

Maximum Power Dissipation

(1)

Feedback Pin Current

(TO-263) (See

)

Figure 21.

Figure 22.

Load Transient Response

Switching Waveforms

V_OUT= 5V

A: Output Pin Voltage, 10V/div

B: Output Pin Current, 1A/div

C: Inductor Current, 0.5A/div

D: Output Ripple Voltage, 20 mV/div,

AC-Coupled

Horizontal Time Base: 5 μs/div

Figure 23.

Figure 24.

(1) If the DDPAK/TO-263 package is used, the thermal resistance can be reduced by increasing the PC board copper area thermally

connected to the package: Using 0.5 square inches of copper area, θ_JAis 50°C/W; with 1 square inch of copper area, θ_JAis 37°C/W;

and with 1.6 or more square inches of copper area, θ_JAis 32°C/W.

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TEST CIRCUIT AND LAYOUT GUIDELINES

As in any switching regulator, layout is very important. Rapidly switching currents associated with wiring

inductance generate voltage transients which can cause problems. For minimal inductance and ground loops, the

length of the leads indicated by heavy lines should be kept as short as possible. Single-point grounding (as

indicated) or ground plane construction should be used for best results. When using the Adjustable version,

physically locate the programming resistors near the regulator, to keep the sensitive feedback wiring short.

C_IN— 100 μF, 75V, Aluminum Electrolytic

C_OUT— 330 μF, 25V, Aluminum Electrolytic

D1 — Schottky, 11DQ06

L1 — 330 μH, PE-52627 (for 5V in, 3.3V out, use 100 μH, PE-92108)

Figure 25. Fixed Output Voltage Versions

where

V_REF= 1.23V, R1 between 1k and 5k.

R1 — 2k, 0.1%

R2 — 6.12k, 0.1%

Pin numbers are for the TO-220 package.

Figure 26. Adjustable Output Voltage Version

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LM2575 Series Buck Regulator Design Procedure

PROCEDURE (Fixed Output Voltage Versions)

EXAMPLE (Fixed Output Voltage Versions)

Given:

V_OUT= 5V

V_IN(Max) = Maximum Input Voltage

V_IN(Max) = 20V

V_OUT= Regulated Output Voltage (3.3V, 5V, 12V, or 15V)

I_LOAD(Max) = Maximum Load Current

I_LOAD(Max) = 0.8A

1. Inductor Selection (L1)

A. Select the correct Inductor value selection guide from Figure 27, A. Use the selection guide shown in Figure 28.

Figure 28, Figure 29 and Figure 30 (Output voltages of 3.3V, 5V,

12V or 15V respectively). For other output voltages, see the design

procedure of Figure 26 .

B. From the selection guide, the inductance area intersected by the

20V line and 0.8A line is L330.

C. Inductor value required is 330 μH. From the table in Table 2,

choose AIE 415-0926, Pulse Engineering PE-52627, or RL1952.

B. From the inductor value selection guide, identify the inductance

region intersected by V_IN(Max) and I_LOAD(Max), and note the

inductor code for that region.

C. Identify the inductor value from the inductor code, and select an

appropriate inductor from the table shown in Table 2. Part numbers

are listed for three inductor manufacturers. The inductor chosen

must be rated for operation at the LM2575 switching frequency (52

kHz) and for a current rating of 1.15 × I_LOAD. For additional inductor

information, see INDUCTOR SELECTION.

2. Output Capacitor Selection (C_OUT

)

2. Output Capacitor Selection (C_OUT)

A. The value of the output capacitor together with the inductor A. C_OUT= 100 μF to 470 μF standard aluminum electrolytic.

defines the dominate pole-pair of the switching regulator loop. For

B. Capacitor voltage rating = 20V.

stable operation and an acceptable output ripple voltage,

(approximately 1% of the output voltage) a value between 100 μF

and 470 μF is recommended.

B. The capacitor's voltage rating should be at least 1.5 times greater

than the output voltage. For a 5V regulator, a rating of at least 8V is

appropriate, and a 10V or 15V rating is recommended.

Higher voltage electrolytic capacitors generally have lower ESR

numbers, and for this reason it may be necessary to select a

capacitor rated for a higher voltage than would normally be needed.

3. Catch Diode Selection (D1)

A. The catch-diode current rating must be at least 1.2 times greater A. For this example, a 1A current rating is adequate.

than the maximum load current. Also, if the power supply design

B. Use a 30V 1N5818 or SR103 Schottky diode, or any of the

must withstand a continuous output short, the diode should have a

suggested fast-recovery diodes shown in Table 1.

current rating equal to the maximum current limit of the LM2575. The

most stressful condition for this diode is an overload or shorted

output condition.

B. The reverse voltage rating of the diode should be at least 1.25

times the maximum input voltage.

4. Input Capacitor (C_IN

An aluminum or tantalum electrolytic bypass capacitor located close A 47 μF, 25V aluminum electrolytic capacitor located near the input

to the regulator is needed for stable operation. and ground pins provides sufficient bypassing.

)

4. Input Capacitor (C_IN)

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Inductor Value Selection Guides

(For Continuous Mode Operation)

Figure 27. LM2575(HV)-3.3

Figure 28. LM2575(HV)-5.0

Figure 29. LM2575(HV)-12

Figure 30. LM2575(HV)-15

Figure 31. LM2575(HV)-ADJ

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PROCEDURE (Adjustable Output Voltage Versions)

EXAMPLE (Adjustable Output Voltage Versions)

Given:

V_OUT= Regulated Output Voltage

V_IN(Max) = Maximum Input Voltage

I_LOAD(Max) = Maximum Load Current

F = Switching Frequency (Fixed at 52 kHz)

V_OUT= 10V

V_IN(Max) = 25V

I_LOAD(Max) = 1A

F = 52 kHz

1. Programming Output Voltage (Selecting R1 and R2, as shown 1. Programming Output Voltage (Selecting R1 and R2)

in Figure 25 and Figure 26)

Use the following formula to select the appropriate resistor values.

(1)

(3)

R₁can be between 1k and 5k. (For best temperature coefficient and

stability with time, use 1% metal film resistors)

R2 = 1k (8.13 − 1) = 7.13k, closest 1% value is 7.15k

(2)

2. Inductor Selection (L1)

A. Calculate the inductor Volt • microsecond constant,

E • T (V • μs), from the following formula:

A. Calculate E • T (V • μs)

(5)

(4)

B. E • T = 115 V • μs

B. Use the E • T value from the previous formula and match it with

the E • T number on the vertical axis of the Inductor Value

Selection Guide shown in Figure 31.

C. I_LOAD(Max) = 1A

D. Inductance Region = H470

E. Inductor Value = 470 μH Choose from AIE part #430-0634, Pulse

Engineering part #PE-53118, or Renco part #RL-1961.

C. On the horizontal axis, select the maximum load current.

D. Identify the inductance region intersected by the E • T value and

the maximum load current value, and note the inductor code for that

region.

E. Identify the inductor value from the inductor code, and select an

appropriate inductor from the table shown in Table 2. Part numbers

are listed for three inductor manufacturers. The inductor chosen

must be rated for operation at the LM2575 switching frequency (52

kHz) and for a current rating of 1.15 × I_LOAD. For additional inductor

information, see INDUCTOR SELECTION.

3. Output Capacitor Selection (C_OUT

)

3. Output Capacitor Selection (C_OUT

)

A. The value of the output capacitor together with the inductor A.

defines the dominate pole-pair of the switching regulator loop. For

stable operation, the capacitor must satisfy the following

requirement:

(7)

However, for acceptable output ripple voltage select

_OUT≥ 220 μF

(6)

C_OUT= 220 μF electrolytic capacitor

The above formula yields capacitor values between 10 μF and 2000

μF that will satisfy the loop requirements for stable operation. But to

achieve an acceptable output ripple voltage, (approximately 1% of

the output voltage) and transient response, the output capacitor may

need to be several times larger than the above formula yields.

B. The capacitor's voltage rating should be at last 1.5 times greater

than the output voltage. For a 10V regulator, a rating of at least 15V

or more is recommended.

Higher voltage electrolytic capacitors generally have lower ESR

numbers, and for this reason it may be necessary to select a

capacitor rate for a higher voltage than would normally be needed.

(Continued)

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PROCEDURE (Adjustable Output Voltage Versions)

4. Catch Diode Selection (D1)

EXAMPLE (Adjustable Output Voltage Versions)

4. Catch Diode Selection (D1)

A. The catch-diode current rating must be at least 1.2 times greater A. For this example, a 3A current rating is adequate.

than the maximum load current. Also, if the power supply design

B. Use a 40V MBR340 or 31DQ04 Schottky diode, or any of the

suggested fast-recovery diodes in Table 1.

must withstand a continuous output short, the diode should have a

current rating equal to the maximum current limit of the LM2575. The

most stressful condition for this diode is an overload or shorted

output. See Table 1.

B. The reverse voltage rating of the diode should be at least 1.25

times the maximum input voltage.

5. Input Capacitor (C_IN

An aluminum or tantalum electrolytic bypass capacitor located close A 100 μF aluminum electrolytic capacitor located near the input and

to the regulator is needed for stable operation. ground pins provides sufficient bypassing.

)

5. Input Capacitor (C_IN)

To further simplify the buck regulator design procedure, TI is making available computer design software to be

used with the Simple Switcher line of switching regulators. Switchers Made Simple (version 3.3) is available on

a (3½″) diskette for IBM compatible computers from a TI sales office in your area.

Table 1. Diode Selection Guide

Schottky

Fast Recovery

V_R

20V

30V

1N5817

MBR120P

SR102

1N5820

MBR320

SR302

The following

diodes are all

rated to 100V:

The following

diodes are all

rated to 100V:

1N5818

MBR130P

11DQ03

SR103

1N5821

MBR330

31DQ03

SR303

11DF1

MUR110

HER102

31DF1

MURD310

HER302

40V

1N5819

MBR140P

11DQ04

SR104

IN5822

MBR340

31DQ04

SR304

50V

60V

MBR150

11DQ05

SR105

MBR350

31DQ05

SR305

MBR160

11DQ06

SR106

MBR360

31DQ06

SR306

Table 2. Inductor Selection by Manufacturer's Part Number

(1)

(2)

(3)

Inductor Code

L100

Inductor Value

100 μH

Schott

Pulse Eng.

PE-92108

PE-53113

PE-52626

PE-52627

PE-53114

PE-52629

PE-53115

PE-53116

PE-53117

PE-53118

PE-53119

PE-53120

Renco

67127000

67127010

67127020

67127030

67127040

67127050

67127060

67127070

67127080

67127090

67127100

67127110

RL2444

RL1954

RL1953

RL1952

RL1951

RL1950

RL2445

RL2446

RL2447

RL1961

RL1960

RL1959

L150

150 μH

L220

220 μH

L330

330 μH

L470

470 μH

L680

680 μH

H150

150 μH

H220

220 μH

H330

330 μH

H470

470 μH

H680

680 μH

H1000

1000 μH

(1) Schott Corp., (612) 475-1173, 1000 Parkers Lake Rd., Wayzata, MN 55391.

(2) Pulse Engineering, (619) 674-8100, P.O. Box 12236, San Diego, CA 92112.

(3) Renco Electronics Inc., (516) 586-5566, 60 Jeffryn Blvd. East, Deer Park, NY 11729.

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Table 2. Inductor Selection by Manufacturer's Part Number (continued)

(1)

(2)

(3)

Inductor Code

Inductor Value

1500 μH

Schott

Pulse Eng.

PE-53121

PE-53122

Renco

H1500

H2200

67127120

67127130

RL1958

RL2448

2200 μH

APPLICATION HINTS

INPUT CAPACITOR (C_IN)

To maintain stability, the regulator input pin must be bypassed with at least a 47 μF electrolytic capacitor. The

capacitor's leads must be kept short, and located near the regulator.

If the operating temperature range includes temperatures below −25°C, the input capacitor value may need to be

larger. With most electrolytic capacitors, the capacitance value decreases and the ESR increases with lower

temperatures and age. Paralleling a ceramic or solid tantalum capacitor will increase the regulator stability at cold

temperatures. For maximum capacitor operating lifetime, the capacitor's RMS ripple current rating should be

greater than

(8)

INDUCTOR SELECTION

All switching regulators have two basic modes of operation: continuous and discontinuous. The difference

between the two types relates to the inductor current, whether it is flowing continuously, or if it drops to zero for a

period of time in the normal switching cycle. Each mode has distinctively different operating characteristics,

which can affect the regulator performance and requirements.

The LM2575 (or any of the Simple Switcher family) can be used for both continuous and discontinuous modes of

operation.

The inductor value selection guides in Figure 27 through Figure 31 were designed for buck regulator designs of

the continuous inductor current type. When using inductor values shown in the inductor selection guide, the

peak-to-peak inductor ripple current will be approximately 20% to 30% of the maximum DC current. With

relatively heavy load currents, the circuit operates in the continuous mode (inductor current always flowing), but

under light load conditions, the circuit will be forced to the discontinuous mode (inductor current falls to zero for a

period of time). This discontinuous mode of operation is perfectly acceptable. For light loads (less than

approximately 200 mA) it may be desirable to operate the regulator in the discontinuous mode, primarily because

of the lower inductor values required for the discontinuous mode.

The selection guide chooses inductor values suitable for continuous mode operation, but if the inductor value

chosen is prohibitively high, the designer should investigate the possibility of discontinuous operation. The

computer design software Switchers Made Simple will provide all component values for discontinuous (as well

as continuous) mode of operation.

Inductors are available in different styles such as pot core, toriod, E-frame, bobbin core, etc., as well as different

core materials, such as ferrites and powdered iron. The least expensive, the bobbin core type, consists of wire

wrapped on a ferrite rod core. This type of construction makes for an inexpensive inductor, but since the

magnetic flux is not completely contained within the core, it generates more electromagnetic interference (EMI).

This EMI can cause problems in sensitive circuits, or can give incorrect scope readings because of induced

voltages in the scope probe.

The inductors listed in the selection chart include ferrite pot core construction for AIE, powdered iron toroid for

Pulse Engineering, and ferrite bobbin core for Renco.

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An inductor should not be operated beyond its maximum rated current because it may saturate. When an

inductor begins to saturate, the inductance decreases rapidly and the inductor begins to look mainly resistive (the

DC resistance of the winding). This will cause the switch current to rise very rapidly. Different inductor types have

different saturation characteristics, and this should be kept in mind when selecting an inductor.

The inductor manufacturer's data sheets include current and energy limits to avoid inductor saturation.

INDUCTOR RIPPLE CURRENT

When the switcher is operating in the continuous mode, the inductor current waveform ranges from a triangular

to a sawtooth type of waveform (depending on the input voltage). For a given input voltage and output voltage,

the peak-to-peak amplitude of this inductor current waveform remains constant. As the load current rises or falls,

the entire sawtooth current waveform also rises or falls. The average DC value of this waveform is equal to the

DC load current (in the buck regulator configuration).

If the load current drops to a low enough level, the bottom of the sawtooth current waveform will reach zero, and

the switcher will change to a discontinuous mode of operation. This is a perfectly acceptable mode of operation.

Any buck switching regulator (no matter how large the inductor value is) will be forced to run discontinuous if the

load current is light enough.

OUTPUT CAPACITOR

An output capacitor is required to filter the output voltage and is needed for loop stability. The capacitor should

be located near the LM2575 using short pc board traces. Standard aluminum electrolytics are usually adequate,

but low ESR types are recommended for low output ripple voltage and good stability. The ESR of a capacitor

depends on many factors, some which are: the value, the voltage rating, physical size and the type of

construction. In general, low value or low voltage (less than 12V) electrolytic capacitors usually have higher ESR

numbers.

The amount of output ripple voltage is primarily a function of the ESR (Equivalent Series Resistance) of the

output capacitor and the amplitude of the inductor ripple current (ΔI_IND). (See INDUCTOR RIPPLE CURRENT).

The lower capacitor values (220 μF–680 μF) will allow typically 50 mV to 150 mV of output ripple voltage, while

larger-value capacitors will reduce the ripple to approximately 20 mV to 50 mV.

Output Ripple Voltage = (ΔI_IND) (ESR of C_OUT

)

(9)

To further reduce the output ripple voltage, several standard electrolytic capacitors may be paralleled, or a

higher-grade capacitor may be used. Such capacitors are often called “high-frequency,” “low-inductance,” or

“low-ESR.” These will reduce the output ripple to 10 mV or 20 mV. However, when operating in the continuous

mode, reducing the ESR below 0.05Ω can cause instability in the regulator.

Tantalum capacitors can have a very low ESR, and should be carefully evaluated if it is the only output capacitor.

Because of their good low temperature characteristics, a tantalum can be used in parallel with aluminum

electrolytics, with the tantalum making up 10% or 20% of the total capacitance.

The capacitor's ripple current rating at 52 kHz should be at least 50% higher than the peak-to-peak inductor

ripple current.

CATCH DIODE

Buck regulators require a diode to provide a return path for the inductor current when the switch is off. This diode

should be located close to the LM2575 using short leads and short printed circuit traces.

Because of their fast switching speed and low forward voltage drop, Schottky diodes provide the best efficiency,

especially in low output voltage switching regulators (less than 5V). Fast-Recovery, High-Efficiency, or Ultra-Fast

Recovery diodes are also suitable, but some types with an abrupt turn-off characteristic may cause instability and

EMI problems. A fast-recovery diode with soft recovery characteristics is a better choice. Standard 60 Hz diodes

(example: 1N4001 or 1N5400, and so on.) are also not suitable. See Table 1 for Schottky and “soft” fast-

recovery diode selection guide.

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OUTPUT VOLTAGE RIPPLE AND TRANSIENTS

The output voltage of a switching power supply will contain a sawtooth ripple voltage at the switcher frequency,

typically about 1% of the output voltage, and may also contain short voltage spikes at the peaks of the sawtooth

waveform.

The output ripple voltage is due mainly to the inductor sawtooth ripple current multiplied by the ESR of the output

capacitor. (See INDUCTOR SELECTION)

The voltage spikes are present because of the fast switching action of the output switch, and the parasitic

inductance of the output filter capacitor. To minimize these voltage spikes, special low inductance capacitors can

be used, and their lead lengths must be kept short. Wiring inductance, stray capacitance, as well as the scope

probe used to evaluate these transients, all contribute to the amplitude of these spikes.

An additional small LC filter (20 μH & 100 μF) can be added to the output (as shown in Figure 37) to further

reduce the amount of output ripple and transients. A 10 × reduction in output ripple voltage and transients is

possible with this filter.

FEEDBACK CONNECTION

The LM2575 (fixed voltage versions) feedback pin must be wired to the output voltage point of the switching

power supply. When using the adjustable version, physically locate both output voltage programming resistors

near the LM2575 to avoid picking up unwanted noise. Avoid using resistors greater than 100 kΩ because of the

increased chance of noise pickup.

ON /OFF INPUT

For normal operation, the ON /OFF pin should be grounded or driven with a low-level TTL voltage (typically

below 1.6V). To put the regulator into standby mode, drive this pin with a high-level TTL or CMOS signal. The

ON /OFF pin can be safely pulled up to +V_INwithout a resistor in series with it. The ON /OFF pin should not be

left open.

GROUNDING

To maintain output voltage stability, the power ground connections must be low-impedance (see Figure 26). For

the TO-3 style package, the case is ground. For the 5-lead TO-220 style package, both the tab and pin 3 are

ground and either connection may be used, as they are both part of the same copper lead frame.

With the CDIP or SOIC packages, all the pins labeled ground, power ground, or signal ground should be

soldered directly to wide printed circuit board copper traces. This assures both low inductance connections and

good thermal properties.

HEAT SINK/THERMAL CONSIDERATIONS

In many cases, no heat sink is required to keep the LM2575 junction temperature within the allowed operating

range. For each application, to determine whether or not a heat sink will be required, the following must be

identified:

1. Maximum ambient temperature (in the application).

2. Maximum regulator power dissipation (in application).

3. Maximum allowed junction temperature (150°C for the LM1575 or 125°C for the LM2575). For a safe,

conservative design, a temperature approximately 15°C cooler than the maximum temperature should be

selected.

4. LM2575 package thermal resistances θ_JAand θ_JC.

Total power dissipated by the LM2575 can be estimated as follows:

P_D= (V_IN) (I_Q) + (V_O/V_IN) (I_LOAD) (V_SAT

)

where

•

I_Q(quiescent current) and V_SATcan be found in the Characteristic Curves shown previously,

V_INis the applied minimum input voltage,

V_Ois the regulated output voltage

and I_LOADis the load current.

(10)

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The dynamic losses during turn-on and turn-off are negligible if a Schottky type catch diode is used.

When no heat sink is used, the junction temperature rise can be determined by the following:

ΔT_J= (P_D) (θ_JA)

(11)

To arrive at the actual operating junction temperature, add the junction temperature rise to the maximum ambient

temperature.

T_J= ΔT_J+ T_A

(12)

If the actual operating junction temperature is greater than the selected safe operating junction temperature

determined in step 3, then a heat sink is required.

When using a heat sink, the junction temperature rise can be determined by the following:

ΔT_J= (P_D) (θ_JC+ θ_interface+ θ_{Heat sink}

)

(13)

The operating junction temperature will be:

T_J= T_A+ ΔT_J

(14)

As shown in Equation 14, if the actual operating junction temperature is greater than the selected safe operating

junction temperature, then a larger heat sink is required (one that has a lower thermal resistance).

When using the LM2575 in the plastic CDIP or surface mount SOIC packages, several items about the thermal

properties of the packages should be understood. The majority of the heat is conducted out of the package

through the leads, with a minor portion through the plastic parts of the package. Since the lead frame is solid

copper, heat from the die is readily conducted through the leads to the printed circuit board copper, which is

acting as a heat sink.

For best thermal performance, the ground pins and all the unconnected pins should be soldered to generous

amounts of printed circuit board copper, such as a ground plane. Large areas of copper provide the best transfer

of heat to the surrounding air. Copper on both sides of the board is also helpful in getting the heat away from the

package, even if there is no direct copper contact between the two sides. Thermal resistance numbers as low as

40°C/W for the SOIC package, and 30°C/W for the CDIP package can be realized with a carefully engineered pc

board.

Included on the Switchers Made Simple design software is a more precise (non-linear) thermal model that can

be used to determine junction temperature with different input-output parameters or different component values.

It can also calculate the heat sink thermal resistance required to maintain the regulators junction temperature

below the maximum operating temperature.

ADDITIONAL APPLICATIONS

INVERTING REGULATOR

Figure 32 shows a LM2575-12 in a buck-boost configuration to generate a negative 12V output from a positive

input voltage. This circuit bootstraps the regulator's ground pin to the negative output voltage, then by grounding

the feedback pin, the regulator senses the inverted output voltage and regulates it to −12V.

For an input voltage of 12V or more, the maximum available output current in this configuration is approximately

0.35A. At lighter loads, the minimum input voltage required drops to approximately 4.7V.

The switch currents in this buck-boost configuration are higher than in the standard buck-mode design, thus

lowering the available output current. Also, the start-up input current of the buck-boost converter is higher than

the standard buck-mode regulator, and this may overload an input power source with a current limit less than

1.5A. Using a delayed turn-on or an undervoltage lockout circuit (described in the NEGATIVE BOOST

REGULATOR section) would allow the input voltage to rise to a high enough level before the switcher would be

allowed to turn on.

Because of the structural differences between the buck and the buck-boost regulator topologies, the buck

regulator design procedure section cannot be used to select the inductor or the output capacitor. The

recommended range of inductor values for the buck-boost design is between 68 μH and 220 μH, and the output

capacitor values must be larger than what is normally required for buck designs. Low input voltages or high

output currents require a large value output capacitor (in the thousands of micro Farads).

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The peak inductor current, which is the same as the peak switch current, can be calculated from the following

formula:

where

•

f_osc= 52 kHz.

(15)

Under normal continuous inductor current operating conditions, the minimum V_INrepresents the worst case.

Select an inductor that is rated for the peak current anticipated.

Also, the maximum voltage appearing across the regulator is the absolute sum of the input and output voltage.

For a −12V output, the maximum input voltage for the LM2575 is +28V, or +48V for the LM2575HV.

The Switchers Made Simple (version 3.3) design software can be used to determine the feasibility of regulator

designs using different topologies, different input-output parameters, different components, and so on.

Figure 32. Inverting Buck-Boost Develops −12V

NEGATIVE BOOST REGULATOR

Another variation on the buck-boost topology is the negative boost configuration. The circuit in Figure 33 accepts

an input voltage ranging from −5V to −12V and provides a regulated −12V output. Input voltages greater than

−12V will cause the output to rise above −12V, but will not damage the regulator.

Because of the boosting function of this type of regulator, the switch current is relatively high, especially at low

input voltages. Output load current limitations are a result of the maximum current rating of the switch. Also,

boost regulators can not provide current limiting load protection in the event of a shorted load, so some other

means (such as a fuse) may be necessary.

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Feedback

OUT

1000 mF

LM2575-12

Output

Low ESR

GND

1N5817

ON/OFF

100 mF

OUT

= -12V

150 mH

-V

-5V to -12V

Typical Load Current

200 mA for V_IN= −5.2V

500 mA for V_IN= −7V

Pin numbers are for TO-220 package.

Figure 33. Negative Boost

UNDERVOLTAGE LOCKOUT

In some applications it is desirable to keep the regulator off until the input voltage reaches a certain threshold. An

undervoltage lockout circuit which accomplishes this task is shown in Figure 34, while Figure 35 shows the same

circuit applied to a buck-boost configuration. These circuits keep the regulator off until the input voltage reaches

a predetermined level.

V_TH≈ V_Z1+ 2V_BE(Q1)

(16)

DELAYED STARTUP

The ON /OFF pin can be used to provide a delayed startup feature as shown in Figure 36. With an input voltage

of 20V and for the part values shown, the circuit provides approximately 10 ms of delay time before the circuit

begins switching. Increasing the RC time constant can provide longer delay times. But excessively large RC time

constants can cause problems with input voltages that are high in 60 Hz or 120 Hz ripple, by coupling the ripple

into the ON /OFF pin.

ADJUSTABLE OUTPUT, LOW-RIPPLE

POWER SUPPLY

A 1A power supply that features an adjustable output voltage is shown in Figure 37. An additional L-C filter that

reduces the output ripple by a factor of 10 or more is included in this circuit.

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Complete circuit not shown.

Pin numbers are for the TO-220 package.

Figure 34. Undervoltage Lockout for Buck Circuit

Complete circuit not shown (see Figure 32).

Pin numbers are for the TO-220 package.

Figure 35. Undervoltage Lockout

for Buck-Boost Circuit

Complete circuit not shown.

Pin numbers are for the TO-220 package.

Figure 36. Delayed Startup

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Pin numbers are for the TO-220 package.

Figure 37. 1.2V to 55V Adjustable 1A Power Supply with Low Output Ripple

Definition of Terms

BUCK REGULATORA switching regulator topology in which a higher voltage is converted to a lower voltage.

Also known as a step-down switching regulator.

BUCK-BOOST REGULATORA switching regulator topology in which a positive voltage is converted to a

negative voltage without a transformer.

DUTY CYCLE (D)Ratio of the output switch's on-time to the oscillator period.

(17)

CATCH DIODE OR CURRENT STEERING DIODEThe diode which provides a return path for the load current

when the LM2575 switch is OFF.

EFFICIENCY (η)The proportion of input power actually delivered to the load.

(18)

CAPACITOR EQUIVALENT SERIES RESISTANCE (ESR)The purely resistive component of a real capacitor's

impedance (see Figure 38). It causes power loss resulting in capacitor heating, which directly affects the

capacitor's operating lifetime. When used as a switching regulator output filter, higher ESR values result in

higher output ripple voltages.

Figure 38. Simple Model of a Real Capacitor

Most standard aluminum electrolytic capacitors in the 100 μF–1000 μF range have 0.5Ω to

0.1Ω ESR. Higher-grade capacitors (“low-ESR”, “high-frequency”, or “low-inductance”') in the

100 μF–1000 μF range generally have ESR of less than 0.15Ω.

EQUIVALENT SERIES INDUCTANCE (ESL)The pure inductance component of a capacitor (see Figure 38).

The amount of inductance is determined to a large extent on the capacitor's construction. In a buck

regulator, this unwanted inductance causes voltage spikes to appear on the output.

OUTPUT RIPPLE VOLTAGEThe AC component of the switching regulator's output voltage. It is usually

dominated by the output capacitor's ESR multiplied by the inductor's ripple current (ΔI_IND). The peak-to-

peak value of this sawtooth ripple current can be determined by reading INDUCTOR RIPPLE CURRENT.

Submit Documentation Feedback

Product Folder Links: LM1575 LM2575-N LM2575HV

LM1575, LM2575-N, LM2575HV

www.ti.com

SNVS106E –MAY 1999–REVISED APRIL 2013

CAPACITOR RIPPLE CURRENTRMS value of the maximum allowable alternating current at which a capacitor

can be operated continuously at a specified temperature.

STANDBY QUIESCENT CURRENT (I_STBY)Supply current required by the LM2575 when in the standby mode

(ON /OFF pin is driven to TTL-high voltage, thus turning the output switch OFF).

INDUCTOR RIPPLE CURRENT (ΔI_IND)The peak-to-peak value of the inductor current waveform, typically a

sawtooth waveform when the regulator is operating in the continuous mode (vs. discontinuous mode).

CONTINUOUS/DISCONTINUOUS MODE OPERATIONRelates to the inductor current. In the continuous mode,

the inductor current is always flowing and never drops to zero, vs. the discontinuous mode, where the

inductor current drops to zero for a period of time in the normal switching cycle.

INDUCTOR SATURATIONThe condition which exists when an inductor cannot hold any more magnetic flux.

When an inductor saturates, the inductor appears less inductive and the resistive component dominates.

Inductor current is then limited only by the DC resistance of the wire and the available source current.

OPERATING VOLT MICROSECOND CONSTANT (E•T_op)The product (in VoIt•μs) of the voltage applied to the

inductor and the time the voltage is applied. This E•T_opconstant is a measure of the energy handling

capability of an inductor and is dependent upon the type of core, the core area, the number of turns, and

the duty cycle.

Submit Documentation Feedback

Product Folder Links: LM1575 LM2575-N LM2575HV

LM1575, LM2575-N, LM2575HV

SNVS106E –MAY 1999–REVISED APRIL 2013

www.ti.com

REVISION HISTORY

Changes from Revision D (April 2013) to Revision E

Page

•

Changed layout of National Data Sheet to TI format .......................................................................................................... 25

Submit Documentation Feedback

Product Folder Links: LM1575 LM2575-N LM2575HV

PACKAGE OPTION ADDENDUM

www.ti.com

11-Apr-2013

PACKAGING INFORMATION

Orderable Device

LM2575HVMX-5.0

Status Package Type Package Pins Package

Eco Plan Lead/Ball Finish

MSL Peak Temp

Op Temp (°C)

-40 to 125

Top-Side Markings

Samples

Drawing

Qty

(1)

(2)

(3)

(4)

ACTIVE

SOIC

PDIP

1000

TBD

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

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CU SN

Call TI

CU SN

Call TI

Level-3-260C-168 HR

Call TI

LM2575HVM

-5.0 P+

LM2575HVMX-5.0/NOPB

LM2575HVN-5.0

ACTIVE

NBG

KTT

1000

500

Green (RoHS

& no Sb/Br)

LM2575HVM

-5.0 P+

TBD

LM2575HVN

-5.0 P+

LM2575HVN-5.0/NOPB

LM2575HVN-ADJ

Green (RoHS

& no Sb/Br)

Level-1-NA-UNLIM

Call TI

LM2575HVN

-5.0 P+

TBD

LM2575HVN

-ADJ P+

LM2575HVN-ADJ/NOPB

LM2575HVS-12

Green (RoHS

& no Sb/Br)

Level-1-NA-UNLIM

Call TI

LM2575HVN

-ADJ P+

DDPAK/

TO-263

TBD

LM2575HVS

-12 P+

LM2575HVS-12/NOPB

LM2575HVS-15

DDPAK/

TO-263

Pb-Free (RoHS

Exempt)

Level-3-245C-168 HR

Call TI

LM2575HVS

-12 P+

DDPAK/

TO-263

TBD

LM2575HVS

-15 P+

LM2575HVS-15/NOPB

LM2575HVS-3.3

DDPAK/

TO-263

Pb-Free (RoHS

Exempt)

Level-3-245C-168 HR

Call TI

LM2575HVS

-15 P+

DDPAK/

TO-263

TBD

LM2575HVS

-3.3 P+

LM2575HVS-3.3/NOPB

LM2575HVS-5.0

DDPAK/

TO-263

Pb-Free (RoHS

Exempt)

Level-3-245C-168 HR

Call TI

LM2575HVS

-3.3 P+

DDPAK/

TO-263

TBD

LM2575HVS

-5.0 P+

LM2575HVS-5.0/NOPB

LM2575HVS-ADJ

DDPAK/

TO-263

Pb-Free (RoHS

Exempt)

Level-3-245C-168 HR

Call TI

LM2575HVS

-5.0 P+

DDPAK/

TO-263

TBD

LM2575HVS

-ADJ P+

LM2575HVS-ADJ/NOPB

LM2575HVSX-15

DDPAK/

TO-263

Pb-Free (RoHS

Exempt)

Level-3-245C-168 HR

Call TI

LM2575HVS

-ADJ P+

DDPAK/

TO-263

TBD

LM2575HVS

-15 P+

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

11-Apr-2013

Orderable Device

Status Package Type Package Pins Package

Eco Plan Lead/Ball Finish

MSL Peak Temp

Op Temp (°C)

-40 to 125

Top-Side Markings

Samples

Drawing

Qty

(1)

(2)

(3)

(4)

LM2575HVSX-15/NOPB

LM2575HVSX-3.3

ACTIVE

DDPAK/

TO-263

KTT

500

Pb-Free (RoHS

Exempt)

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Level-3-245C-168 HR

LM2575HVS

-15 P+

ACTIVE

DDPAK/

TO-263

KTT

500

TBD

Call TI

LM2575HVS

-3.3 P+

LM2575HVSX-3.3/NOPB

LM2575HVSX-5.0

DDPAK/

TO-263

Pb-Free (RoHS

Exempt)

Level-3-245C-168 HR

Call TI

LM2575HVS

-3.3 P+

DDPAK/

TO-263

TBD

LM2575HVS

-5.0 P+

LM2575HVSX-5.0/NOPB

LM2575HVSX-ADJ

DDPAK/

TO-263

Pb-Free (RoHS

Exempt)

Level-3-245C-168 HR

Call TI

LM2575HVS

-5.0 P+

DDPAK/

TO-263

TBD

LM2575HVS

-ADJ P+

LM2575HVSX-ADJ/NOPB

LM2575HVT-12

DDPAK/

TO-263

Pb-Free (RoHS

Exempt)

Level-3-245C-168 HR

Call TI

LM2575HVS

-ADJ P+

TO-220

TBD

LM2575HVT

-12 P+

LM2575HVT-12/LB03

LM2575HVT-12/LF03

LM2575HVT-12/NOPB

LM2575HVT-15

NDH

TBD

Call TI

LM2575HVT

-12 P+

Green (RoHS

& no Sb/Br)

Level-1-NA-UNLIM

Call TI

LM2575HVT

-12 P+

Green (RoHS

& no Sb/Br)

-40 to 125

LM2575HVT

-12 P+

TBD

LM2575HVT

-15 P+

LM2575HVT-15/LB03

LM2575HVT-15/LF03

LM2575HVT-15/NOPB

LM2575HVT-3.3

NDH

TBD

Call TI

LM2575HVT

-15 P+

Green (RoHS

& no Sb/Br)

Level-1-NA-UNLIM

Call TI

LM2575HVT

-15 P+

Green (RoHS

& no Sb/Br)

-40 to 125

LM2575HVT

-15 P+

TBD

LM2575HVT

-3.3 P+

LM2575HVT-3.3/LF03

LM2575HVT-3.3/NOPB

NDH

Green (RoHS

& no Sb/Br)

Level-1-NA-UNLIM

LM2575HVT

-3.3 P+

Green (RoHS

& no Sb/Br)

-40 to 125

LM2575HVT

-3.3 P+

Addendum-Page 2

PACKAGE OPTION ADDENDUM

www.ti.com

11-Apr-2013

Orderable Device

Status Package Type Package Pins Package

Eco Plan Lead/Ball Finish

MSL Peak Temp

Op Temp (°C)

Top-Side Markings

Samples

Drawing

Qty

(1)

(2)

(3)

(4)

LM2575HVT-5.0

LM2575HVT-5.0/LB03

LM2575HVT-5.0/LF03

LM2575HVT-5.0/NOPB

LM2575HVT-ADJ

ACTIVE

TO-220

SOIC

TBD

Call TI

CU SN

Call TI

CU SN

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CU SN

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CU SN

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CU SN

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CU SN

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CU SN

Call TI

-40 to 125

LM2575HVT

-5.0 P+

ACTIVE

NDH

TBD

Call TI

LM2575HVT

-5.0 P+

Green (RoHS

& no Sb/Br)

Level-1-NA-UNLIM

Call TI

LM2575HVT

-5.0 P+

Green (RoHS

& no Sb/Br)

-40 to 125

LM2575HVT

-5.0 P+

TBD

LM2575HVT

-ADJ P+

LM2575HVT-ADJ/LB03

LM2575HVT-ADJ/LF03

LM2575HVT-ADJ/NOPB

LM2575M-5.0

NDH

TBD

Call TI

LM2575HVT

-ADJ P+

Green (RoHS

& no Sb/Br)

Level-1-NA-UNLIM

Call TI

LM2575HVT

-ADJ P+

Green (RoHS

& no Sb/Br)

-40 to 125

LM2575HVT

-ADJ P+

NBG

TBD

LM2575M

-5.0 P+

LM2575M-5.0/NOPB

LM2575M-ADJ

SOIC

Green (RoHS

& no Sb/Br)

Level-3-260C-168 HR

Call TI

LM2575M

-5.0 P+

SOIC

TBD

LM2575M

-ADJ P+

LM2575M-ADJ/NOPB

LM2575MX-5.0

SOIC

Green (RoHS

& no Sb/Br)

Level-3-260C-168 HR

Call TI

LM2575M

-ADJ P+

SOIC

1000

TBD

LM2575M

-5.0 P+

LM2575MX-5.0/NOPB

LM2575MX-ADJ

SOIC

Green (RoHS

& no Sb/Br)

Level-3-260C-168 HR

Call TI

LM2575M

-5.0 P+

SOIC

TBD

LM2575M

-ADJ P+

LM2575MX-ADJ/NOPB

LM2575N-5.0

SOIC

Green (RoHS

& no Sb/Br)

Level-3-260C-168 HR

Call TI

LM2575M

-ADJ P+

PDIP

TBD

LM2575N

-5.0 P+

LM2575N-5.0/NOPB

PDIP

Green (RoHS

& no Sb/Br)

Level-1-NA-UNLIM

LM2575N

-5.0 P+

Addendum-Page 3

PACKAGE OPTION ADDENDUM

www.ti.com

11-Apr-2013

Orderable Device

Status Package Type Package Pins Package

Eco Plan Lead/Ball Finish

MSL Peak Temp

Op Temp (°C)

-40 to 125

Top-Side Markings

Samples

Drawing

Qty

(1)

(2)

(3)

(4)

LM2575N-ADJ

LM2575N-ADJ/NOPB

LM2575S-12

ACTIVE

PDIP

NBG

TBD

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

Level-1-NA-UNLIM

Call TI

LM2575N

-ADJ P+

ACTIVE

NBG

KTT

Green (RoHS

& no Sb/Br)

LM2575N

-ADJ P+

DDPAK/

TO-263

TBD

LM2575S

-12 P+

LM2575S-12/NOPB

LM2575S-15

DDPAK/

TO-263

Pb-Free (RoHS

Exempt)

Level-3-245C-168 HR

Call TI

LM2575S

-12 P+

DDPAK/

TO-263

TBD

LM2575S

-15 P+

LM2575S-15/NOPB

LM2575S-3.3

DDPAK/

TO-263

Pb-Free (RoHS

Exempt)

Level-3-245C-168 HR

Call TI

LM2575S

-15 P+

DDPAK/

TO-263

TBD

LM2575S

-3.3 P+

LM2575S-3.3/NOPB

LM2575S-5.0

DDPAK/

TO-263

Pb-Free (RoHS

Exempt)

Level-3-245C-168 HR

Call TI

LM2575S

-3.3 P+

DDPAK/

TO-263

TBD

LM2575S

-5.0 P+

LM2575S-5.0/NOPB

LM2575S-ADJ

DDPAK/

TO-263

Pb-Free (RoHS

Exempt)

Level-3-245C-168 HR

Call TI

LM2575S

-5.0 P+

DDPAK/

TO-263

TBD

LM2575S

-ADJ P+

LM2575S-ADJ/NOPB

LM2575SX-12

DDPAK/

TO-263

Pb-Free (RoHS

Exempt)

Level-3-245C-168 HR

Call TI

LM2575S

-ADJ P+

DDPAK/

TO-263

500

TBD

LM2575S

-12 P+

LM2575SX-12/NOPB

LM2575SX-15

DDPAK/

TO-263

Pb-Free (RoHS

Exempt)

Level-3-245C-168 HR

Call TI

LM2575S

-12 P+

DDPAK/

TO-263

TBD

LM2575S

-15 P+

LM2575SX-15/NOPB

LM2575SX-3.3

DDPAK/

TO-263

Pb-Free (RoHS

Exempt)

Level-3-245C-168 HR

Call TI

LM2575S

-15 P+

DDPAK/

TO-263

TBD

LM2575S

-3.3 P+

LM2575SX-3.3/NOPB

DDPAK/

TO-263

Pb-Free (RoHS

Exempt)

Level-3-245C-168 HR

LM2575S

-3.3 P+

Addendum-Page 4

PACKAGE OPTION ADDENDUM

www.ti.com

11-Apr-2013

Orderable Device

Status Package Type Package Pins Package

Eco Plan Lead/Ball Finish

MSL Peak Temp

Op Temp (°C)

-40 to 125

Top-Side Markings

Samples

Drawing

Qty

(1)

(2)

(3)

(4)

LM2575SX-5.0

LM2575SX-5.0/NOPB

LM2575SX-ADJ

ACTIVE

DDPAK/

TO-263

KTT

500

TBD

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

Level-3-245C-168 HR

Call TI

LM2575S

-5.0 P+

ACTIVE

DDPAK/

TO-263

KTT

500

Pb-Free (RoHS

Exempt)

LM2575S

-5.0 P+

DDPAK/

TO-263

TBD

LM2575S

-ADJ P+

LM2575SX-ADJ/NOPB

LM2575T-12

DDPAK/

TO-263

Pb-Free (RoHS

Exempt)

Level-3-245C-168 HR

Call TI

LM2575S

-ADJ P+

TO-220

TBD

LM2575T

-12 P+

LM2575T-12/LB03

LM2575T-12/LF03

LM2575T-12/NOPB

LM2575T-15

NDH

TBD

Call TI

LM2575T

-12 P+

Green (RoHS

& no Sb/Br)

Level-1-NA-UNLIM

Call TI

LM2575T

-12 P+

Green (RoHS

& no Sb/Br)

-40 to 125

LM2575T

-12 P+

TBD

LM2575T

-15 P+

LM2575T-15/LF03

LM2575T-15/NOPB

LM2575T-3.3

NDH

Green (RoHS

& no Sb/Br)

Level-1-NA-UNLIM

Call TI

LM2575T

-15 P+

Green (RoHS

& no Sb/Br)

-40 to 125

LM2575T

-15 P+

TBD

LM2575T

-3.3 P+

LM2575T-3.3/LF03

LM2575T-3.3/NOPB

LM2575T-5.0

NDH

Green (RoHS

& no Sb/Br)

Level-1-NA-UNLIM

Call TI

LM2575T

-3.3 P+

Green (RoHS

& no Sb/Br)

-40 to 125

LM2575T

-3.3 P+

TBD

LM2575T

-5.0 P+

LM2575T-5.0/LB03

LM2575T-5.0/LF02

LM2575T-5.0/LF03

NDH

NEB

NDH

TBD

Call TI

LM2575T

-5.0 P+

Green (RoHS

& no Sb/Br)

Level-1-NA-UNLIM

LM2575T

-5.0 P+

Green (RoHS

& no Sb/Br)

LM2575T

-5.0 P+

Addendum-Page 5

PACKAGE OPTION ADDENDUM

www.ti.com

11-Apr-2013

Orderable Device

Status Package Type Package Pins Package

Eco Plan Lead/Ball Finish

MSL Peak Temp

Op Temp (°C)

Top-Side Markings

Samples

Drawing

Qty

(1)

(2)

(3)

(4)

LM2575T-5.0/LF04

LM2575T-5.0/NOPB

LM2575T-ADJ

ACTIVE

TO-220

NEB

Green (RoHS

& no Sb/Br)

CU SN

Call TI

CU SN

Level-1-NA-UNLIM

Call TI

LM2575T

-5.0 P+

ACTIVE

Green (RoHS

& no Sb/Br)

-40 to 125

LM2575T

-5.0 P+

TBD

LM2575T

-ADJ P+

LM2575T-ADJ/LB03

LM2575T-ADJ/LF02

LM2575T-ADJ/LF03

LM2575T-ADJ/NOPB

NDH

NEB

NDH

TBD

Call TI

LM2575T

-ADJ P+

Green (RoHS

& no Sb/Br)

Level-1-NA-UNLIM

LM2575T

-ADJ P+

Green (RoHS

& no Sb/Br)

LM2575T

-ADJ P+

Green (RoHS

& no Sb/Br)

-40 to 125

LM2575T

-ADJ P+

⁽¹⁾The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

⁽²⁾Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability

information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that

lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between

the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight

in homogeneous material)

⁽³⁾MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

(4)

Multiple Top-Side Markings will be inside parentheses. Only one Top-Side Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a

continuation of the previous line and the two combined represent the entire Top-Side Marking for that device.

Addendum-Page 6

PACKAGE OPTION ADDENDUM

www.ti.com

11-Apr-2013

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information

provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and

continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.

TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

Addendum-Page 7

PACKAGE MATERIALS INFORMATION

www.ti.com

8-Apr-2013

TAPE AND REEL INFORMATION

*All dimensions are nominal

Device

Package Package Pins

Type Drawing

SPQ

Reel

Pin1

Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant

(mm) W1 (mm)

LM2575HVMX-5.0

SOIC

KTT

1000

500

330.0

24.4

10.8

15.9

3.2

5.0

12.0

16.0

24.0

LM2575HVMX-5.0/NOPB SOIC

LM2575HVSX-15

DDPAK/

TO-263

10.75 14.85

LM2575HVSX-15/NOPB DDPAK/

TO-263

KTT

500

330.0

24.4

5.0

16.0

24.0

LM2575HVSX-3.3

DDPAK/

TO-263

LM2575HVSX-3.3/NOPB DDPAK/

TO-263

LM2575HVSX-5.0

DDPAK/

TO-263

LM2575HVSX-5.0/NOPB DDPAK/

TO-263

LM2575HVSX-ADJ

DDPAK/

TO-263

LM2575HVSX-ADJ/NOPB DDPAK/

TO-263

LM2575MX-5.0

SOIC

1000

330.0

24.4

10.8

15.9

3.2

12.0

24.0

LM2575MX-5.0/NOPB

Pack Materials-Page 1

PACKAGE MATERIALS INFORMATION

www.ti.com

8-Apr-2013

Device

Package Package Pins

Type Drawing

SPQ

Reel

Pin1

Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant

(mm) W1 (mm)

LM2575MX-ADJ

LM2575MX-ADJ/NOPB

LM2575SX-12

SOIC

KTT

1000

500

330.0

24.4

10.8

15.9

3.2

5.0

12.0

16.0

24.0

DDPAK/

TO-263

10.75 14.85

LM2575SX-12/NOPB

LM2575SX-15

DDPAK/

TO-263

KTT

500

330.0

24.4

5.0

16.0

24.0

DDPAK/

TO-263

LM2575SX-15/NOPB

LM2575SX-3.3

DDPAK/

TO-263

DDPAK/

TO-263

LM2575SX-3.3/NOPB

LM2575SX-5.0

DDPAK/

TO-263

DDPAK/

TO-263

LM2575SX-5.0/NOPB

LM2575SX-ADJ

DDPAK/

TO-263

DDPAK/

TO-263

LM2575SX-ADJ/NOPB DDPAK/

TO-263

Pack Materials-Page 2

PACKAGE MATERIALS INFORMATION

www.ti.com

8-Apr-2013

*All dimensions are nominal

Device

Package Type Package Drawing Pins

SPQ

Length (mm) Width (mm) Height (mm)

LM2575HVMX-5.0

LM2575HVMX-5.0/NOPB

LM2575HVSX-15

SOIC

1000

500

1000

500

367.0

45.0

SOIC

DDPAK/TO-263

KTT

LM2575HVSX-15/NOPB

LM2575HVSX-3.3

LM2575HVSX-3.3/NOPB DDPAK/TO-263

LM2575HVSX-5.0 DDPAK/TO-263

LM2575HVSX-5.0/NOPB DDPAK/TO-263

LM2575HVSX-ADJ DDPAK/TO-263

LM2575HVSX-ADJ/NOPB DDPAK/TO-263

LM2575MX-5.0

LM2575MX-5.0/NOPB

LM2575MX-ADJ

SOIC

LM2575MX-ADJ/NOPB

LM2575SX-12

SOIC

DDPAK/TO-263

KTT

LM2575SX-12/NOPB

LM2575SX-15

LM2575SX-15/NOPB

LM2575SX-3.3

LM2575SX-3.3/NOPB

LM2575SX-5.0

LM2575SX-5.0/NOPB

LM2575SX-ADJ

LM2575SX-ADJ/NOPB

Pack Materials-Page 3

MECHANICAL DATA

NDH0005D

www.ti.com

MECHANICAL DATA

NBG0016G

www.ti.com

MECHANICAL DATA

KTT0005B

TS5B (Rev D)

BOTTOM SIDE OF PACKAGE

www.ti.com

MECHANICAL DATA

NEB0005B

www.ti.com

MECHANICAL DATA

NEB0005F

www.ti.com

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Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

LM2575HVS-15/NOPB [TI]

相关型号：

LM2575HVS-3.3

LM2575HVS-3.3

LM2575HVS-3.3/NOPB

LM2575HVS-3.3EP

LM2575HVS-5.0

LM2575HVS-5.0

LM2575HVS-5.0/NOPB

LM2575HVS-5.0EP

LM2575HVS-5.0EP/NOPB

LM2575HVS-ADJ

LM2575HVS-ADJ

LM2575HVS-ADJ/NOPB