基于LM2576的3A正压转负压电路_正电压转负电压芯片资源-CSDN文库

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LM2576

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LM2576电源翻转电路.rar （3个子文件）

【F.H.】LM2576电源翻转电路

【F.H.】说明.txt 635B

【F.H.】3A正压转负压电路.ddb 204KB

【F.H.】LM2576英文手册COOL.pdf 784KB

LM2576/LM2576HV Series

SIMPLE SWITCHER

3A Step-Down Voltage Regulator

General 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 avail-

able in fixed output voltages of 3.3V, 5V, 12V, 15V, and an

adjustable output version.

Requiring a minimum number of external components, these

regulators are simple to use and include internal frequency

compensation and a fixed-frequency oscillator.

The LM2576 series offers a high-efficiency replacement for

popular three-terminal linear regulators. It substantially re-

duces 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 out-

put voltage within specified input voltages and output load

conditions, and

10% on the oscillator frequency. External

shutdown is included, featuring 50 µA (typical) standby cur-

rent. The output switch includes cycle-by-cycle current limit-

ing, as well as thermal shutdown for full protection under

fault conditions.

Features

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

n Adjustable version output voltage range,

1.23V to 37V (57V for HV version)

4% max over

line and load conditions

n Guaranteed 3A output current

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

HV version

n Requires only 4 external components

n 52 kHz fixed frequency internal oscillator

n TTL shutdown capability, low power standby mode

n High efficiency

n Uses readily available standard inductors

n Thermal shutdown and current limit protection

n P+ Product Enhancement tested

Applications

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

n Efficient pre-regulator for linear regulators

n On-card switching regulators

n Positive to negative converter (Buck-Boost)

Typical Application (Fixed Output Voltage

Versions)

SIMPLE SWITCHER

is a registered trademark of National Semiconductor Corporation.

01147601

FIGURE 1.

August 2004

LM2576/LM2576HV Series SIMPLE SWITCHER 3A Step-Down Voltage Regulator

Block Diagram

01147602

3.3V R2 = 1.7k

5V, R2 = 3.1k

12V, R2 = 8.84k

15V, R2 = 11.3k

For ADJ. Version

R1 = Open, R2 = 0Ω

Patent Pending

Ordering Information

Temperature

Range

Output Voltage NS Package Package

Type

3.3 5.0 12 15 ADJ Number

−40˚C ≤ T

≤ 125˚C

LM2576HVS-3.3 LM2576HVS-5.0 LM2576HVS-12 LM2576HVS-15 LM2576HVS-ADJ TS5B TO-263

LM2576S-3.3 LM2576S-5.0 LM2576S-12 LM2576S-15 LM2576S-ADJ

LM2576HVSX-3.3 LM2576HVSX-5.0 LM2576HVSX-12 LM2576HVSX-15 LM2576HVSX-ADJ TS5B

Tape & Reel

LM2576SX-3.3 LM2576SX-5.0 LM2576SX-12 LM2576SX-15 LM2576SX-ADJ

LM2576HVT-3.3 LM2576HVT-5.0 LM2576HVT-12 LM2576HVT-15 LM2576HVT-ADJ T05A TO-220

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

LM2576HVT-3.3 LM2576HVT-5.0 LM2576HVT-12 LM2576HVT-15 LM2576HVT-ADJ T05D

Flow LB03 Flow LB03 Flow LB03 Flow LB03 Flow LB03

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

Flow LB03 Flow LB03 Flow LB03 Flow LB03 Flow LB03

LM2576/LM2576HV

www.national.com 2

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Maximum Supply Voltage

LM2576 45V

LM2576HV 63V

ON /OFF Pin Input Voltage

−0.3V ≤ V ≤ +V

Output Voltage to Ground

(Steady State) −1V

Power Dissipation Internally Limited

Storage Temperature Range −65˚C to +150˚C

Maximum Junction Temperature 150˚C

Minimum ESD Rating

(C = 100 pF, R = 1.5 kΩ)2kV

Lead Temperature

(Soldering, 10 Seconds) 260˚C

Operating Ratings

Temperature Range

LM2576/LM2576HV −40˚C ≤ T

≤ +125˚C

Supply Voltage

LM2576 40V

LM2576HV 60V

LM2576-3.3, LM2576HV-3.3

Electrical Characteristics

Specifications with standard type face are for T

= 25˚C, and those with boldface type apply over full Operating Temperature

Range.

Symbol Parameter Conditions LM2576-3.3 Units

(Limits)

LM2576HV-3.3

Typ Limit

(Note 2)

SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2

OUT

Output Voltage V

= 12V, I

LOAD

= 0.5A 3.3 V

Circuit of Figure 2 3.234 V(Min)

3.366 V(Max)

OUT

Output Voltage 6V ≤ V

≤ 40V, 0.5A ≤ I

LOAD

≤ 3A 3.3 V

LM2576 Circuit of Figure 2 3.168/3.135 V(Min)

3.432/3.465 V(Max)

OUT

Output Voltage 6V ≤ V

≤ 60V, 0.5A ≤ I

LOAD

≤ 3A 3.3 V

LM2576HV Circuit of Figure 2 3.168/3.135 V(Min)

3.450/3.482 V(Max)

η Efficiency V

= 12V, I

LOAD

=3A 75 %

LM2576-5.0, LM2576HV-5.0

Electrical Characteristics

Specifications with standard type face are for T

= 25˚C, and those with Figure 2 boldface type apply over full Operating Tem-

perature Range.

Symbol Parameter Conditions LM2576-5.0 Units

(Limits)

LM2576HV-5.0

Typ Limit

(Note 2)

SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2

OUT

Output Voltage V

= 12V, I

LOAD

= 0.5A 5.0 V

Circuit of Figure 2 4.900 V(Min)

5.100 V(Max)

OUT

Output Voltage 0.5A ≤ I

LOAD

≤ 3A, 5.0 V

LM2576 8V ≤ V

≤ 40V 4.800/4.750 V(Min)

Circuit of Figure 2 5.200/5.250 V(Max)

OUT

Output Voltage 0.5A ≤ I

LOAD

≤ 3A, 5.0 V

LM2576HV 8V ≤ V

≤ 60V 4.800/4.750 V(Min)

Circuit of Figure 2 5.225/5.275 V(Max)

LM2576/LM2576HV

www.national.com3

LM2576-5.0, LM2576HV-5.0

Electrical Characteristics

(Continued)

Specifications with standard type face are for T

= 25˚C, and those with Figure 2 boldface type apply over full Operating Tem-

perature Range.

Symbol Parameter Conditions LM2576-5.0 Units

(Limits)

LM2576HV-5.0

Typ Limit

(Note 2)

SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2

η Efficiency V

= 12V, I

LOAD

=3A 77 %

LM2576-12, LM2576HV-12

Electrical Characteristics

Specifications with standard type face are for T

= 25˚C, and those with boldface type apply over full Operating Temperature

Range.

Symbol Parameter Conditions LM2576-12 Units

(Limits)

LM2576HV-12

Typ Limit

(Note 2)

SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2

OUT

Output Voltage V

= 25V, I

LOAD

= 0.5A 12 V

Circuit of Figure 2 11.76 V(Min)

12.24 V(Max)

OUT

Output Voltage 0.5A ≤ I

LOAD

≤ 3A, 12 V

LM2576 15V ≤ V

≤ 40V 11.52/11.40 V(Min)

Circuit of Figure 2 12.48/12.60 V(Max)

OUT

Output Voltage 0.5A ≤ I

LOAD

≤ 3A, 12 V

LM2576HV 15V ≤ V

≤ 60V 11.52/11.40 V(Min)

Circuit of Figure 2 12.54/12.66 V(Max)

η Efficiency V

= 15V, I

LOAD

=3A 88 %

LM2576-15, LM2576HV-15

Electrical Characteristics

Specifications with standard type face are for T

= 25˚C, and those with boldface type apply over full Operating Temperature

Range.

Symbol Parameter Conditions LM2576-15 Units

(Limits)

LM2576HV-15

Typ Limit

(Note 2)

SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2

OUT

Output Voltage V

= 25V, I

LOAD

= 0.5A 15 V

Circuit of Figure 2 14.70 V(Min)

15.30 V(Max)

OUT

Output Voltage 0.5A ≤ I

LOAD

≤ 3A, 15 V

LM2576 18V ≤ V

≤ 40V 14.40/14.25 V(Min)

Circuit of Figure 2 15.60/15.75 V(Max)

OUT

Output Voltage 0.5A ≤ I

LOAD

≤ 3A, 15 V

LM2576HV 18V ≤ V

≤ 60V 14.40/14.25 V(Min)

Circuit of Figure 2 15.68/15.83 V(Max)

η Efficiency V

= 18V, I

LOAD

=3A 88 %

LM2576/LM2576HV

www.national.com 4

LM2576-ADJ, LM2576HV-ADJ

Electrical Characteristics

Specifications with standard type face are for T

= 25˚C, and those with boldface type apply over full Operating Temperature

Range.

Symbol Parameter Conditions LM2576-ADJ Units

(Limits)

LM2576HV-ADJ

Typ Limit

(Note 2)

SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2

OUT

Feedback Voltage V

= 12V, I

LOAD

= 0.5A 1.230 V

OUT

= 5V, 1.217 V(Min)

Circuit of Figure 2 1.243 V(Max)

OUT

Feedback Voltage 0.5A ≤ I

LOAD

≤ 3A, 1.230 V

LM2576 8V ≤ V

≤ 40V 1.193/1.180 V(Min)

OUT

= 5V, Circuit of Figure 2 1.267/1.280 V(Max)

OUT

Feedback Voltage 0.5A ≤ I

LOAD

≤ 3A, 1.230 V

LM2576HV 8V ≤ V

≤ 60V 1.193/1.180 V(Min)

OUT

= 5V, Circuit of Figure 2 1.273/1.286 V(Max)

η Efficiency V

= 12V, I

LOAD

= 3A, V

OUT

=5V 77 %

All Output Voltage Versions

Electrical Characteristics

Specifications with standard type face are for T

= 25˚C, and those with boldface type apply over full Operating Temperature

Range. Unless otherwise specified, V

= 12V for the 3.3V, 5V, and Adjustable version, V

= 25V for the 12V version, and V

= 30V for the 15V version. I

LOAD

= 500 mA.

Symbol Parameter Conditions LM2576-XX Units

(Limits)

LM2576HV-XX

Typ Limit

(Note 2)

DEVICE PARAMETERS

Feedback Bias Current V

OUT

= 5V (Adjustable Version Only) 50 100/500 nA

Oscillator Frequency (Note 11) 52 kHz

47/42 kHz

(Min)

58/63 kHz

(Max)

SAT

Saturation Voltage I

OUT

= 3A (Note 4) 1.4 V

1.8/2.0 V(Max)

DC Max Duty Cycle (ON) (Note 5) 98 %

93 %(Min)

Current Limit (Notes 4, 11) 5.8 A

4.2/3.5 A(Min)

6.9/7.5 A(Max)

Output Leakage Current (Notes 6, 7): Output = 0V 2 mA(Max)

Output = −1V 7.5 mA

Output = −1V 30 mA(Max)

Quiescent Current (Note 6) 5 mA

10 mA(Max)

STBY

Standby Quiescent ON /OFF Pin = 5V (OFF) 50 µA

Current 200 µA(Max)

LM2576/LM2576HV

www.national.com5

评论收藏

内容反馈

zhongsongjin

2015-07-10

之前有用过，不过这个电路有可能正反馈
普通网友

2013-02-27

芯片还可以，电路可用性一般。很多场合要慎用才行。
yjansrg

2014-07-12

原理太过复杂
小哥该吃药了

2013-09-04

设计的好复杂不过考虑很周全
liqianying1

2014-01-09

没参考此电路，找到了其他解决方法。不过这种电路有机会可以实践一下。

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