LM2576-5.0BT

更新时间： 2024-11-15 05:42:03

品牌	Logo	应用领域
麦瑞 - MICREL		稳压器
页数	文件大小	规格书
8页	92K
描述
52kHz Simple 3A Buck Voltage Regulator

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中文翻译

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LM2576-5.0BT 数据手册

LM2576

Micrel

LM2576

52kHz Simple 3A Buck Voltage Regulator

General Description

Features

The LM2576 series of monolithic integrated circuits provide

all the active functions for a step-down (buck) switching

regulator.Fixedversionsareavailablewitha3.3V,5V,or12V

fixed output. Adjustable versions have an output voltage

rangefrom1.23Vto37V. Bothversionsarecapableofdriving

a 3A load with excellent line and load regulation.

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

• Voltage over specified line and load conditions:

Fixed version: ±3% max. output voltage

Adjustable version: ±2% max. feedback voltage

• Guaranteed 3A output current

• Wide input voltage range:

4V to 40V

• Wide output voltage range

1.23V to 37V

These regulators are simple to use because they require a

minimumnumberofexternalcomponentsandincludeinternal

frequency compensation and a fixed-frequency oscillator.

The LM2576 series offers a high efficiency replacement for

popular three-terminal adjustable linear regulators. It

substantially reduces the size of the heat sink, and in many

cases no heat sink is required.

• Requires only 4 external components

• 52kHz fixed frequency internal oscillator

• Low power standby mode I typically < 200µA

• 80% efficiency (adjustable version typically > 80%)

• Uses readily available standard inductors

• Thermal shutdown and current limit protection

• 100% electrical thermal limit burn-in

Astandardseriesofinductorsavailablefromseveraldifferent

manufacturers are ideal for use with the LM2576 series. This

feature greatly simplifies the design of switch-mode power

supplies.

The feedback voltage is guaranteed to ±2% tolerance for

adjustable versions, and the output voltage is guaranteed to

±3% for fixed versions, within specified input voltages and

outputloadconditions.Theoscillatorfrequencyisguaranteed

to ±10%. External shutdown is included, featuring less than

200µA standby current. The output switch includes cycle-by-

cycle current limiting and 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 (inverting Buck-Boost)

• Isolated Flyback Converter using minimum number of

external components

• Negative Boost Converter

Typical Applications

870 20

7V–40V

Unregulated

DC Input

7V–40V

Unregulated

DC Input

+5V, 3A

Regulated

Output

+5V, 3A

Regulated

Output

Feedback

LM2576-5.0

LM2576

3 5

Output

+V_IN

100µH

R2 3.09k

R1 1k

C_IN

100µF

Gnd On/Off

1N5822

C_OUT

1000µF

C_OUT

1000µF

100µF

Note: Pin numbers are for TO-220 Package

_OUT= 1.23 1 +

( )

Fixed Regulator in Typical Application

Adjustable Regulator in Fixed Output Application

4-120

October 1998

12 3 4 5 6 7 8

中文翻译

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LM2576-5.0BT 替代型号

型号	品牌	替代类型	描述	数据表
LM2576T-5.0/NOPB	TI	功能相似	LM2576/LM2576HV Series SIMPLE SWITCHERÂ® 3A S
LM2576TV-5G	ONSEMI	功能相似	3.0 A, 15 V, Step−Down Switching Regulator
LM2576T-005G	ONSEMI	功能相似	3.0 A, 15 V, Step−Down Switching Regulator

与LM2576-5.0BT相关器件

型号	品牌	获取价格	描述	数据表
LM2576-5.0BT⒂	MICREL	获取价格	52kHz Simple 3A Buck Voltage Regulator
LM2576-5.0BT-LB02	MICROCHIP	获取价格	3.5A SWITCHING REGULATOR, 52kHz SWITCHING FREQ-MAX, PSFM5
LM2576-5.0BT-LB03	MICROCHIP	获取价格	3.5A SWITCHING REGULATOR, 52kHz SWITCHING FREQ-MAX, PSFM5
LM2576-5.0BU	MICREL	获取价格	52kHz Simple 3A Buck Voltage Regulator
LM2576-5.0BUT&R	MICROCHIP	获取价格	Switching Regulator, Voltage-mode, 7.5A, 63kHz Switching Freq-Max, PSSO5, TO-263, 5 PIN
LM2576-5.0WT	MICREL	获取价格	52kHz Simple 3A Buck Regulator
LM2576-5.0WU	MICREL	获取价格	52kHz Simple 3A Buck Regulator
LM2576-5.0WUTR	MICREL	获取价格	7.5A SWITCHING REGULATOR, 63kHz SWITCHING FREQ-MAX, PSSO5, ROHS COMPLIANT, TO-263, 5 PIN
LM2576ADJ	MOTOROLA	获取价格	Easy Switcher 3.0A Step-Down Voltage Regulato
LM2576-ADJ	MOTOROLA	获取价格	Easy Switcher 3.0A Step-Down Voltage Regulator

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