LM2576HVT-ADJ_技术文档

3A, 52kHz, Step-down Switching Regulator

LM2576HV

FEATURES

 Step-down Switching Regulator

SOP-8PP PKG

 Adjustable Version Output Voltage Range, 1.23V to 52V

± 4% Max over Line and Load conditions

 Guaranteed Output Current of 3A

TO-263 PKG

 Fixed Output Voltages : 3.3V, 5.0V, 12V and 15V

 Wide Input Voltage Range 60V

 52 kHz Fixed Frequency Oscillator

 TTL Shutdown Capability, Low Power Standby Mode

 Requires only 4 External Components

 High Efficiency

TO-220 PKG

 Use Readily Available Standard Inductors

 Available in TO-220, TO-263 and SOP-8PP Packages

 Thermal Shutdown and Current Limit Protection

 Moisture Sensitivity Level 3

ORDERING INFORMATION

Device

APPLICATION

Package

 Simple high-efficiency step-down (buck) regulator

 Efficient pre-regulator for linear regulators

 On-card switching regulators

LM2576HVDP-ADJ

LM2576HVDP-X.X

LM2576HVR-ADJ

LM2576HVR-X.X

LM2576HVT-ADJ

SOP-8PP 8L

TO-263 5L

TO-220 5L

 Positive to negative converter (Buck-Boost)

LM2576HVT-X.X

X.X = Output Voltage = 3.3, 5.0, 12, 15

DESCRIPSION

The LM2576HV series of regulators are monolithic integrated circuits that provide all the active functions for a

step-down (buck) switching regulator, capable of driving 3A load with excellent line and load regulation. These

devices are available in fixed output voltages of 3.3V, 5.0V, 12V, 15V and adjustable output versions.

Requiring a minimum number of external components, these regulators are simple to use and include internal

frequency compensation and a fixed-frequency oscillator. The LM2576HV series offers a high-efficiency

replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in

some cases no heat sink is required. A standard series of inductors optimized for use with the LM2576HV are

available from several different manufacturers. This feature greatly simplifies the design of switch-mode power

supplies. Other features include a guaranteed ± 4% tolerance on output voltage within specified input voltages

and output load conditions, and ± 10% on the oscillator frequency. External shutdown is included, featuring 50uA

(typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown

for full protection under fault conditions.

Absolute Maximum Ratings ^{(Note 1)}

CHARACTERISTIC

SYMBOL

V_IN

MIN.

MAX.

UNIT

Input Supply Voltage

-

63

V

ON/OFF Pin Input Voltage

-0.3

-0.75

+ V_IN

Output Voltage to Ground (Steady State)

Lead Temperature (Soldering, 5 sec)

Storage Temperature Range

V

T_SOL

T_STG

T_JOPR

260

150

℃

-65

-

Maximum Junction Temperature Range

Feb. 2014 – R1.0

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HTC

3A, 52kHz, Step-down Switching Regulator

LM2576HV

Operating Ratings

CHARACTERISTIC

SYMBOL

MIN.

-

MAX.

60

UNIT

Supply Voltage

V_IN

T_J

V

Temperature Range

-40

125

Ordering Information

V_OUT

Package

Order No.

Description

Supplied As

Status

SOP-8PP 8L LM2576HVDP -ADJ

3A, 52kHz, Adjustable

3A, 52kHz, Fixed

Reel

Tube

Reel

Tube

Reel

Tube

Reel

Tube

Reel

Tube

Contact us

TO-263 5L

TO-220 5L

LM2576HVR

LM2576HVT

-ADJ

ADJ

SOP-8PP 8L LM2576HVDP -3.3

TO-263 5L

TO-220 5L

LM2576HVR

LM2576HVT

-3.3

3.3V

5.0V

12V

15V

SOP-8PP 8L LM2576HVDP -5.0

TO-263 5L

TO-220 5L

LM2576HVR

LM2576HVT

-5.0

SOP-8PP 8L LM2576HVDP -12

TO-263 5L

TO-220 5L

LM2576HVR

LM2576HVT

-12

SOP-8PP 8L LM2576HVDP -15

TO-263 5L

TO-220 5L

LM2576HVR

LM2576HVT

-15

LM 2576HV

Output Voltage : ADJ / 3.3V / 5.0V /12V

DP : SOP8-PP

Package Type

T : TO-220-5L

R : TO-263-5L

Root Name

Product Code

Feb. 2014 – R1.0

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HTC

3A, 52kHz, Step-down Switching Regulator

LM2576HV

PIN CONFIGURATION

5. ON/OFF

4. FB/ADJ

3. GND

2. VOUT

1. VIN

5. ON/OFF

4. FB/ADJ

3. GND

2. VOUT

1. VIN

VIN 1.

VOUT 2.

FB/ADJ 3.

On/Off 4.

8. GND

7. GND

6. GND

5. GND

SOP-8PP

TO-263

TO-220

PIN DESCRIPTION

TO-263 / TO-220 5 LEAD

SOP-8PP 8 LEAD

Function

Pin No.

Name

VIN

Function

Name

VIN

1

2

Input Supply

Output Voltage

Input Supply

VOUT

Output Voltage

Feedback

3

GND

Ground

FB / ADJ

or Output Adjust

Output Voltage

Feedback

4

FB / ADJ

ON/OFF

GND

ON/OFF Shutdown

or Output Adjust

5/ 6/ 7/ 8

ON/OFF Shutdown

Ground

* Exposed Pad of SOP8-PP package should be externally connected to GND.

TYPICAL APPLICATION

- Fixed Output Voltage Version

LM2576HV

L1

100uH

Regulated Output

5V

Input Voltage

OUTPUT

VIN

Feed

back

ON/OFF

C_IN

100uF

+

GND

+

C_OUT

1000uF

D1

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HTC

3A, 52kHz, Step-down Switching Regulator

LM2576HV

ELECTRICAL CHARACTERISTICS

Specifications with standard type face are for T_J= 25℃ 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=500mA.

PARAMETER

SYMBOL

TEST CONDITION ^{(Note 2)}

MIN.

TYP.

MAX.

UNIT

SYSTEM PARAMETERS ^{(Note 3)}

V

_IN=12V, I_LOAD=0.5A

1.217

1.230

3.300

5.000

12.00

15.00

1.243

V

Feedback Voltage

V_FB

LM2576HV-ADJ

LM2576HV-3.3

LM2576HV-5.0

LM2576HV-12

0.5A ≤ I_LOAD≤ 3A ,

8V ≤ V_IN≤ 55V

1.193

1.273

1.180

1.286

V_IN=12V, I_LOAD=0.5A

3.234

3.366

0.5A ≤ I_LOAD≤ 3A ,

6V ≤ VI_N≤ 55V

3.168

3.450

3.135

3.482

V_IN=12V, I_LOAD=0.5A

4.900

5.100

0.5A ≤ I_LOAD≤ 3A ,

8V ≤ V_IN≤ 55V

4.800

5.225

4.750

5.275

Output Voltage

V_O

V_IN=25V, I_LOAD=0.5A

11.76

12.24

0.5A ≤ I_LOAD≤ 3A ,

15V ≤ V_IN≤ 55V

11.52

12.54

11.40

12.66

V_IN=25V, I_LOAD=0.5A

14.70

15.30

LM2576HV-15

0.5A ≤ I_LOAD≤ 3A ,

18V ≤ V_IN≤ 55V

V_IN=12V, I_LOAD=3A,

Vo = 5V

14.40

15.68

14.25

15.83

LM2576HV-ADJ

77

%

LM2576HV-3.3

LM2576HV-5.0

LM2576HV-12

LM2576HV-15

V_IN=12V, I_LOAD=3A

V_IN=15V, I_LOAD=3A

V_IN=18V, I_LOAD=3A

75

77

88

%

Efficiency

DEVICE PARAMETERS

Feedback Bias

Current

100

500

58

I_b

V_O= 5V (Adjustable Version Only)

(Note 8)

50

52

nA

47

Oscillator Frequency

f_O

kHZ

42

63

1.55

1.70

Saturation Voltage

Max Duty Cycle(ON)

Current Limit

V_SAT

DC

I_CL

I_O= 3A (Note 4)

(Note 5)

1.4

98

V

%

A

93

4.2

6.9

(Note 4, 8)

5.8

3.5

7.5

Feb. 2014 – R1.0

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HTC

3A, 52kHz, Step-down Switching Regulator

LM2576HV

(Continued)

PARAMETER

SYMBOL

TEST CONDITION

MIN.

TYP.

7.5

5

MAX.

UNIT

mA

uA

Output Leakage

Current

I_L

(Notes 6, 7) Output=0V

Quiescent Current

I_Q

(Note 6)

10

Standby Quiescent

Current

ON/OFF Pin = 5V

(OFF)

I_STBY

V_IN= 60V

50

200

/OFF CONTROL

ON

2.2

V_IH

V_IL

I_IH

V_O= 0V

1.4

1.2

12

0

V

2.4

/OFF Pin

ON

Logic Input Level

1.0

V_O= Nominal Output Voltage

0.8

/OFF Pin = 5V (OFF)

/OFF Pin = 0V (ON)

30

10

uA

ON

/OFF Pin

ON

Input Current

I_IL

Note 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 guarantee specific performance limits. For guaranteed specifications and test

conditions, see the Electrical Characteristics.

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

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

performance. When the 2576HV is used as shown in the Figure 2 test circuit, system performance will be as shown in system

parameters section of Electrical Characteristics.

Note 4. Output pin sourcing current. No diode, inductor or capacitor connected to output.

Note 5. Feedback pin removed from output and connected to 0V.

Note 6. Feedback pin 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.

Note 7. V_IN=60V.

Note 8. The oscillator frequency reduces to approximately 11 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 protections feature lowers the average power

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

Feb. 2014 – R1.0

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HTC

3A, 52kHz, Step-down Switching Regulator

LM2576HV

TYPICAL OPERATING CHARACTERISTIC

Feb. 2014 – R1.0

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HTC

3A, 52kHz, Step-down Switching Regulator

LM2576HV

APPLICATION INFORMATION

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.

- Fixed Output Voltage Version

LM2576HV

L1

100uH

Regulated Output

5V

Input Voltage

OUTPUT

VIN

Feed

back

ON/OFF

C_IN

100uF

+

GND

+

C_OUT

1000uF

D1

MBR360

- Adjustable Output Voltage Version

LM2576HV

L1

100uH

Regulated Output

5V

Input Voltage

OUTPUT

VIN

R2

R1

Feed

back

ON/OFF

C_IN

100uF

+

GND

+

C_OUT

1000uF

D1

MBR360

R2

R1

*

V_OUT= V_REF(1+

V_OUT

)

*

R2 =R1(

-1)

V_REF

where V_REF= 1.23V, R1 between 1KΩ and 5KΩ.

- C_IN: 100uF, 75V, Aluminum Electrolytic

- C_OUT: 1000uF, 25V, Aluminum Electrolytic

- D1 - Schottky, MBR360

- L1 : 100uH, Pulse Eng. PE-92108

- R1 : 2K, 0.1%

- R2 : 6.12K, 0.1%

Feb. 2014 – R1.0

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HTC


型号：	LM2576HVT-ADJ
厂家：	HTC KOREA TAEJIN TECHNOLOGY CO.
描述：	3A, 52kHz, Step-down Switching Regulator
文件：	总7页 (文件大小：592K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LM2576HVT-ADJ [HTC]

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