Datasheet > LM2576SX-12

LM2576SX-12

更新时间： 2024-10-31 22:21:15

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器
页数	文件大小	规格书
24页	744K
描述
SIMPLE SWITCHER 3A Step-Down Voltage Regulator

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LM2576SX-12 数据手册

August 2004

LM2576/LM2576HV Series

SIMPLE SWITCHER^®3A Step-Down Voltage Regulator

General Description

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

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.

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

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.

Applications

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

n Efficient pre-regulator for linear regulators

n On-card switching regulators

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.

n Positive to negative converter (Buck-Boost)

Typical Application (Fixed Output Voltage

Versions)

01147601

FIGURE 1.

SIMPLE SWITCHER^®is a registered trademark of National Semiconductor Corporation.

DS011476

www.national.com

12 3 4 5 6 7...24

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与LM2576SX-12相关器件

型号	品牌	获取价格	描述	数据表
LM2576SX-12/NOPB	ROCHESTER	获取价格	暂无描述
LM2576SX-15	TGS	获取价格	regulators are monolithic integrated circuits that provide all the active functions for a
LM2576SX-15	NSC	获取价格	SIMPLE SWITCHER 3A Step-Down Voltage Regulator
LM2576SX-3.3	TGS	获取价格	regulators are monolithic integrated circuits that provide all the active functions for a
LM2576SX-3.3	TI	获取价格	SIMPLE SWITCHERÂ® 3A Step-Down Voltage Regula
LM2576SX-3.3	NSC	获取价格	SIMPLE SWITCHER 3A Step-Down Voltage Regulator
LM2576SX-3.3/NOPB	TI	获取价格	SIMPLE SWITCHERÂ® 3A Step-Down Voltage Regula
LM2576SX-5.0	TGS	获取价格	regulators are monolithic integrated circuits that provide all the active functions for a
LM2576SX-5.0	NSC	获取价格	SIMPLE SWITCHER 3A Step-Down Voltage Regulator
LM2576SX-5.0/NOPB	TI	获取价格	SIMPLE SWITCHERÂ® 3A Step-Down Voltage Regula

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