LM2576HVT-12 [TGS]

regulators are monolithic integrated circuits that provide all the active functions for a step-down switching; 稳压器是单片集成电路，提供所有活动功能的降压型开关


型号：	LM2576HVT-12
厂家：	Tiger Electronic Co.,Ltd
描述：	regulators are monolithic integrated circuits that provide all the active functions for a step-down switching 稳压器是单片集成电路，提供所有活动功能的降压型开关稳压器开关
文件：	总8页 (文件大小：5067K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

TIGER ELECTRONIC CO.,LTD

LM2576 Series

Description

The LM2576 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,

5V, 12V, 15V, and an adjustable output versions. Requiring a minimum number of external components, these regulators are simple to

use and include internal frequency compensation and

fixed-frequency oscillator. The LM2576 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 LM2576 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 50µA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as

thermal shutdown for full protection under fault conditions.

Note:

Applications

Features

•

Simple high-efficiency step-down (buck) regulator

•

3.3V, 5V, 12V, 15V, and adjustable output versions

Efficient pre-regulator for linear regulators

On-card switching regulators

Positive to negative converter (Buck-Boost)

Adjustable version output voltage range

1.23V to 37V (57V for HV version) ± 4% max over line

and load conditions

•

Guaranteed 3A output current

Wide input voltage range, 40V up to 60V for HV

version

•

Requires only 4 external components

52 kHz fixed frequency oscillator

TTL shutdown capability, low power standby mode

High efficiency

Uses readily available standard inductors

Thermal shutdown and current limit protection

Typical application Figure 1.(Fixed Output Voltage Versions)

LM2576/

LM2576HV-

5.0

FEEDBACK

7V - 40V

(60V for HV)

UNREGULATED

DC INPUT

+VIN

OUTPUT

+5V

REGULATED

OUTPUT

100

ON/OFF

GND

OUT

1000

TIGER ELECTRONICS CO.,LTD

LM2576 Series

Block Diagram

VIN

ON/OFF

INTERNAL

REGULATOR

UNREGULATED

DCINPUT

ON/OFF

CIN

FIXED GAIN

ERRORAMP

FEED-

BACK

3 AMP

DRIVER

SWITCH

COMPARATOR

1.0k

OUTPUT

VOUT

COUT

1.23V

BAND-GAP

REFERENCE

52kHZ

OSCILLATOR

THERMAL

SHUTDOWN

CURRENT

LIMIT

RESET

GND

3.3V, R2 =1.7K

5V, R2 = 3.1K

12V, R2 = 8.84K

15V, R2 =11.3K

For ADJ, Version

R1 = Open, R2 =0Ω

Ordering information

Temperature

Output Voltage, V

Package Type

Range

3.3

5.0

ADJ

TO-263

LM2576SX-3.3

LM2576HVS-3.3 LM2576HVS-5.0 LM2576HVS-12 LM2576HVS-15 LM2576HVS-ADJ

LM2576T-3.3 LM2576T-5.0 LM2576T-12 LM2576T-15 LM2576T-ADJ

LM2576SX-5.0 LM2576SX-12

LM2576SX-15

LM2576SX-ADJ

-25°C ≤ T_A

≤ 75°C

TO-220

LM2576HVT-3.3 LM2576HVT-5.0 LM2576HVT-12 LM2576HVT-15 LM2576HVT-ADJ

TIGER ELECTRONICS CO.,LTD

LM2576 Series

Absolute Maximum Ratings (Note 1)

Parameter

Maximum

Units

Maximum Supply Voltage

LM2576

LM2576HV

ON/OFF Pin Input Voltage

-0.3V ≤ V ≤ +V_IN

Output Voltage to Ground (Steady State)

Power Dissipation

-1

Internally Limited

Storage Temperature Range

-65 to +150

°C

Maximum Junction Temperature

Minimum ESD Rating (C= 100pF, R = 1.5 kΩ)

Lead Temperature (Soldering, 10 Seconds)

150

260

Operating Ratings

Parameter

Temperature Range

LM2576/LM2576HV

Supply Voltage

Value

Units

-40 ≤ T_J≤ +125

°C

LM2576

LM2576HV

Electrical Characteristics LM2576 -3.3,LM2576HV-3.3

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

Symbol

Parameter

Conditions

LM2576-3.3

Units

LM2576HV-3.3

(Limits)

Typ

Limit (Note 2)

SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2

V_OUT

Output Voltage

V_IN=12V, I_LOAD=0.5A

Circuit of Figure 2

3.3

V(Min)

V(Max)

3.234

3.366

3.3

Output Voltage

6V ≤ V_IN≤ 40V, 0.5A ≤ I_LOAD

3A Circuit of Figure 2

≤

LM2576

3.168/3.135

3.432/3.465

V(Min)

V(Max)

Output Voltage

LM2576HV

6V ≤ V_IN≤ 60V, 0.5A ≤ I_LOAD

3A Circuit of Figure 2

3.168/3.135

3.450/3.482

V(Min)

V(Max)

Efficiency

V_IN=12V, I_LOAD=3A

Electrical Characteristics LM2576 -5.0, LM2576HV-5.0

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

Symbol

Parameter

Conditions

LM2576-5.0

Units

LM2576HV-5.0

(Limits)

Typ

Limit (Note 2)

SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2

V_OUT

Output Voltage

V_IN=12V, I_LOAD=0.5A

Circuit of Figure 2

5.0

V(Min)

V(Max)

4.900

5.100

5.0

Output Voltage

0.5A ≤ I_LOAD≤ 3A,

8V ≤ V_IN≤ 40V

Circuit of Figure 2

LM2576

4.800/4.750

5.200/5.250

V(Min)

V(Max)

Output Voltage

0.5A ≤ I_LOAD≤ 3A,

8V ≤ V_IN≤ 60V

Circuit of Figure 2

LM2576HV

4.800/4.750

5.225/5.275

V(Min)

V(Max)

Efficiency

V_IN=12V, I_LOAD=3A

ELECTRONICS CO.,LTD

TIGER

LM2576 Series

Electrical Characteristics LM2576 -12, LM2576HV-12

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

Symbol

Parameter

Conditions

LM2576-12

Units

LM2576HV-12

(Limits)

Typ

Limit(Note 2)

SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2

V_OUT

Output Voltage

V_IN=25V, I_LOAD=0.5A

Circuit of Figure 2

V(Min)

V(Max)

11.76

12.24

Output Voltage

0.5A ≤ I_LOAD≤ 3A,

15V ≤ V_IN≤ 40V

Circuit of Figure 2

LM2576

11.52/11.40

12.48/12.60

V(Min)

V(Max)

Output Voltage

0.5A ≤ I_LOAD≤ 3A,

15V ≤ V_IN≤ 60V

Circuit of Figure 2

LM2576HV

11.52/11.40

12.54/12.66

V(Min)

V(Max)

Efficiency

V_IN=15V, I_LOAD=3A

Electrical Characteristics LM2576 -15, LM2576HV-15

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

Symbol

Parameter

Conditions

LM2576-15

Units

LM2576HV-15

(Limits)

Typ

Limit (Note 2)

SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2

V_OUT

Output Voltage

V_IN=25, I_LOAD=0.5A

Circuit of Figure 2

V(Min)

V(Max)

14.70

15.30

Output Voltage

0.5A ≤ I_LOAD≤ 3A,

18≤ V_IN≤ 40V

Circuit of Figure 2

LM2576

14.40/14.25

15.60/15.75

V(Min)

V(Max)

Output Voltage

0.5A ≤ I_LOAD≤ 3A,

18 ≤ V_IN≤ 60V

Circuit of Figure 2

LM2576HV

14.40/14.25

15.68/15.83

V(Min)

V(Max)

Efficiency

V_IN=18V, I_LOAD=3A

Electrical Characteristics LM2576-ADJ, LM2576HV-ADJ

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

Symbol

Parameter

Conditions

Units

(Limits)

LM2576-ADJ

LM2576HV-ADJ

Typ

Limit(Note 2)

SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2

V_OUT

Feedback Voltage

V_IN=12V, I_LOAD=0.5A,

V_OUT=5V

Circuit of Figure 2

1.230

V(Min)

V(Max)

1.217

1.243

Feedback Voltage

0.5A ≤ I_LOAD≤ 3A , 8V ≤ V_IN

40V V_OUT=5V

Circuit of Figure 2

≤

LM2576

1.193/1.180

1.267/1.280

V(Min)

V(Max)

1.230

Feedback Voltage

0.5A ≤ I_LOAD≤ 3A, 8V ≤ V_IN

60V, V_OUT=5V

Circuit of Figure 2

≤

LM2576HV

1.193/1.180

1.273/1.286

V(Min)

V(Max)

Efficiency

V_IN=12V, I_LOAD=3A, V_OUT=5V

TIGER ELECTRONICS CO.,LTD

LM2576 Series

All Output Voltage Versions

Electrical Characteristics

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=500mA.

Symbol

Parameter

Conditions

Units

(Limits)

LM2576-XX

LM2576HV-XX

Typ

Limit (Note 2)

100/500

DEVICE PARAMETERS

I_b

Feedback Bias Current

V_OUT=5V (Adjustable Version Only)

(Note 8)

f_O

Oscillator Frequency

kHz

47/42

58/63

kHz(Min)

kHz(Max)

V_SAT

I_CL

Saturation Voltage

Max Duty Cycle (ON)

Current Limit

I_OUT=3A (Note 4)

(Note 5)

1.4

1.8/2.0

V(Max)

%(Min)

(Notes 4, 8)

5.8

4.2/3.5

6.9/7.5

A(Min)

A(Max)

I_L

Output Leakage Current

(Notes 6, 7):

mA(Max)

7.5

Output = -1V

I_Q

Quiescent Current

(Note 6)

mA(Max)

I_STBY

Standby Quiescent Current

___

µA

ON/OFF Pin = 5V (OFF)

200

µA(Max)

___

ON/OFF CONTROL

V_IH

V_IL

V_OUT= 0V

1.4

2.2/2.4

1.0/0.8

V(Min)

V(Max)

ON/OFF Pin

V_OUT= Nominal Output Voltage

1.2

Logic Input Level

ON/OFF Pin Input

Current

I_IH

I_IL

µA

µA(Max)

ON/OFF Pin = 5V (OFF)

µA

µA(Max)

ON/OFF Pin = 0V (ON)

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 LM2576/LM2576HV is used as shown in the Figure 2 test circuit, system performance will be a

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=40V (60V for high voltage version).

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%.

ELECTRONICS CO.,LTD

TIGER

LM2576 Series

Typical Performance Characteristics (Circuit of Figure 2)

Normalized Output Voltage

Line Regulation

Dropout Voltage

VIN =20V

LOA D = 500mA

ILOA D = 500mA

L1 = 150

Normalized at

=25°C

ILOA D = 3A

3.3V, 5V & ADJ

12V & 15V

ILOA D = 1A

LOA D = 200mA

IND = 0.1

Ω

JUNCTION TEMPERATURE (°C)

INPUT VOLTAGE (V)

JUNCTION TEMPERATURE (°C)

Standby

Quiescent Current

Current Limit

IN = 25V

IN = 40V

OUT = 5V

Measured at

Ground Pin

ON/OFF = 5V

IN =12 V

=25°C

LOAD = 3A

ILOAD = 200mA

JUNCTION TEMPERATURE (°C)

INPUT VOLTAGE (V)

JUNCTION TEMPERATURE (°C)

Switch Saturation

Voltage

Efficiency

Oscilator Frequency

Normalized at 25°C

LOA D = 3A

TJ =25°C

LOA D = 200mA

15V OUT

-55°C

VIN = 40V

25°C

150°C

ILOA D = 3A

IN = 12V

ILOA D = 200mA

SWITCH CURRENT (A)

INPUT VOLTAGE (V)

JUNCTION TEMPERATURE (°C)

Minimum Operating Voltage

Quiescent Current

vs Duty Cycle

Feedback Voltage

vs Duty Cycle

Adjustable Version Only

LOAD = 500mA

IN = 40V

VIN = 7V

VIN = 40V

IN = 7V

OUT

≈ 1.23V

LOAD = 500mA

ILOAD = 500mA

JUNCTION TEMPERATURE (°C)

DUTY CYCLE (%)

TIGER

ELECTRONICS CO.,LTD

LM2576 Series

All Output Voltage Versions

Electrical Characteristics

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=500mA.

Symbol

Parameter

Conditions

Units

(Limits)

LM2576-XX

LM2576HV-XX

Typ

Limit (Note 2)

100/500

DEVICE PARAMETERS

I_b

Feedback Bias Current

V_OUT=5V (Adjustable Version Only)

(Note 8)

f_O

Oscillator Frequency

kHz

47/42

58/63

kHz(Min)

kHz(Max)

V_SAT

I_CL

Saturation Voltage

Max Duty Cycle (ON)

Current Limit

I_OUT=3A (Note 4)

(Note 5)

1.4

1.8/2.0

V(Max)

%(Min)

(Notes 4, 8)

5.8

4.2/3.5

6.9/7.5

A(Min)

A(Max)

I_L

Output Leakage Current

(Notes 6, 7):

mA(Max)

7.5

Output = -1V

I_Q

Quiescent Current

(Note 6)

mA(Max)

I_STBY

Standby Quiescent Current

___

µA

ON/OFF Pin = 5V (OFF)

200

µA(Max)

___

ON/OFF CONTROL

V_IH

V_IL

V_OUT= 0V

1.4

2.2/2.4

1.0/0.8

V(Min)

V(Max)

ON/OFF Pin

V_OUT= Nominal Output Voltage

1.2

Logic Input Level

ON/OFF Pin Input

Current

I_IH

I_IL

µA

µA(Max)

ON/OFF Pin = 5V (OFF)

µA

µA(Max)

ON/OFF Pin = 0V (ON)

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 LM2576/ LM2576HV is used as shown in the Figure 2 test circuit, system performance will be a

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=40V (60V for high voltage version).

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%.

ELECTRONICS CO.,LTD

TIGER

LM2576 Series

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.

Fixed Output Voltage Versions (Figure 2a)

FEEDBACK

+VIN

LM2576HV-

FIXED OUTPUT

OUT

OUTPUT

100

OUT

ON/OFF

UNREGULATED

DC INPUT

1000

MBR360

C_IN— 100µF, 75V, Aluminum Electrolytic

C_OUT—1000µF, 25V, Aluminum Electrolytic

D1 — Schottky, MBR360

L₁— 100µH, Pulse Eng. PE-92108

R₁— 2k, 0.1%

R₂— 6.12k, 0.1%

Adjustable Output Voltage Version (Figure 2b)

FEEDBACK

+VIN

LM2576HV-

5.00V

OUT

ADJ

OUTPUT

100

7V -60V

UNREGULATED

DC INPUT

GND

C_OUT

ON/OFF

1000

MBR360

V_OUT

_REF1(

)

V_OUT

V_REF

−

R₂

R₁

(

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

REV No:01-060813

TIGER ELECTRONICS CO.,LTD

LM2576HVT-12 [TGS]

相关型号：

LM2576HVT-12/LF03

LM2576HVT-12/NOPB

LM2576HVT-12FLOWLB03

LM2576HVT-12LB03

LM2576HVT-15

LM2576HVT-15

LM2576HVT-15

LM2576HVT-15/LB03

LM2576HVT-15/LF03

LM2576HVT-15/NOPB

LM2576HVT-15FLOWLB03

LM2576HVT-15LB03