Datasheet > LM2596S/T/L-5/ADJ

LM2596S/T/L-5/ADJ

更新时间： 2022-05-27 10:09:58

品牌	Logo	应用领域
其他 - ETC		/
页数	文件大小	规格书
29页	657K
描述
3A输出降压稳压IC,输入电压最大可至40V, 耐压达45V,输出电压为5V/可调, 可调电压范围为1.23V-43V,工作频率150KHz,效率最大达90%,带限流/过热/短路保护功能.

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December 1997

LM2596

SIMPLE SWITCHER^®Power Converter 150 kHz

3A Step-Down Voltage Regulator

General Description

Features

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

The LM2596 series of regulators are monolithic integrated

circuits that provide all the active functions for a step-down

(buck) switching regulator, capable of driving a 3A load with

excellent line and load regulation. These devices are avail-

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

able output version.

n Adjustable version output voltage range, 1.2V to 37V

4% max over line and load conditions

n Available in TO-220 and TO-263 packages

n Guaranteed 3A output load current

n Input voltage range up to 40V

Requiring a minimum number of external components, these

regulators are simple to use and include internal frequency

n Requires only 4 external components

n Excellent line and load regulation specifications

n 150 kHz fixed frequency internal oscillator

n TTL shutdown capability

n Low power standby mode, I_Qtypically 80 µA

n High efficiency

†

compensation , and a fixed-frequency oscillator.

The LM2596 series operates at a switching frequency of

150 kHz thus allowing smaller sized filter components than

what would be needed with lower frequency switching regu-

lators. Available in a standard 5-lead TO-220 package with

several different lead bend options, and a 5-lead TO-263

surface mount package.

n Uses readily available standard inductors

n Thermal shutdown and current limit protection

A standard series of inductors are available from several dif-

ferent manufacturers optimized for use with the LM2596 se-

ries. This feature greatly simplifies the design of

switch-mode power supplies.

Applications

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

n On-card switching regulators

n Positive to negative converter

Other features include a guaranteed 4% tolerance on out-

put voltage under specified input voltage and output load

†

Note: Patent Number 5,382,918.

conditions, and 15% on the oscillator frequency. External

shutdown is included, featuring typically 80 µA standby cur-

rent. Self protection features include a two stage frequency

reducing current limit for the output switch and an over tem-

perature shutdown for complete protection under fault condi-

tions.

Typical Application (Fixed Output Voltage Versions)

DS012583-1

SIMPLE SWITCHER^®and Switchers Made Simple^®are registered trademarks of National Semiconductor Corporation.

DS012583

12 3 4 5 6 7...29

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