LM3578A

更新时间： 2024-10-31 22:51:55

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器开关
页数	文件大小	规格书
18页	1040K
描述
Switching Regulator

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数据手册

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LM3578A 数据手册

April 1998

LM1578A/LM2578A/LM3578A

Switching Regulator

General Description

Features

n Inverting and non-inverting feedback inputs

n 1.0V reference at inputs

The LM1578A is a switching regulator which can easily be

set up for such DC-to-DC voltage conversion circuits as the

buck, boost, and inverting configurations. The LM1578A fea-

tures a unique comparator input stage which not only has

separate pins for both the inverting and non-inverting inputs,

but also provides an internal 1.0V reference to each input,

thereby simplifying circuit design and p.c. board layout. The

output can switch up to 750 mA and has output pins for its

collector and emitter to promote design flexibility. An external

current limit terminal may be referenced to either the ground

or the V_interminal, depending upon the application. In addi-

tion, the LM1578A has an on board oscillator, which sets the

n Operates from supply voltages of 2V to 40V

n Output current up to 750 mA, saturation less than 0.9V

n Current limit and thermal shut down

n Duty cycle up to 90%

Applications

n Switching regulators in buck, boost, inverting, and

single-ended transformer configurations

n Motor speed control

switching frequency with a single external capacitor from

Hz to 100 kHz (typical).

n Lamp flasher

The LM1578A is an improved version of the LM1578, offer-

ing higher maximum ratings for the total supply voltage and

output transistor emitter and collector voltages.

Functional Diagram

DS008711-1

DS008711

www.national.com

12 3 4 5 6 7...18

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