Datasheet > 78S40

78S40

更新时间： 2022-11-26 04:20:56

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器开关通用开关
页数	文件大小	规格书
10页	293K
描述
Universal Switching Regulator Subsystem

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78S40 数据手册

April 1998

LM78S40

Universal Switching Regulator Subsystem

General Description

Features

n Step-up, step-down or inverting switching regulators

n Output adjustable from 1.25V to 40V

n Peak currents to 1.5A without external transistors

n Operation from 2.5V to 40V input

The LM78S40 is a monolithic regulator subsystem consisting

of all the active building blocks necessary for switching regu-

lator systems. The device consists of a temperature com-

pensated voltage reference, a duty-cycle controllable oscilla-

tor with an active current limit circuit, an error amplifier, high

current, high voltage output switch, a power diode and an

uncommitted operational amplifier. The device can drive ex-

ternal NPN or PNP transistors when currents in excess of

1.5A or voltages in excess of 40V are required. The device

can be used for step-down, step-up or inverting switching

regulators as well as for series pass regulators. It features

wide supply voltage range, low standby power dissipation,

high efficiency and low drift. It is useful for any stand-alone,

low part count switching system and works extremely well in

battery operated systems.

n Low standby current drain

n 80 dB line and load regulation

n High gain, high current, independent op amp

n Pulse width modulation with no double pulsing

Block and Connection Diagrams

DS010057-2

16-Lead DIP

DS010057-1

Top View

DS010057

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