Datasheet > LM1577

LM1577

更新时间： 2024-09-12 22:51:55

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
27页	891K
描述
SIMPLE SWITCHER Step-Up Voltage Regulator

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数据手册

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LM1577 数据手册

June 1999

LM1577/LM2577 Series

SIMPLE SWITCHER^®Step-Up Voltage Regulator

General Description

Features

n Requires few external components

n NPN output switches 3.0A, can stand off 65V

n Wide input voltage range: 3.5V to 40V

n Current-mode operation for improved transient

response, line regulation, and current limit

n 52 kHz internal oscillator

The LM1577/LM2577 are monolithic integrated circuits that

provide all of the power and control functions for step-up

(boost), flyback, and forward converter switching regulators.

The device is available in three different output voltage ver-

sions: 12V, 15V, and adjustable.

Requiring a minimum number of external components, these

regulators are cost effective, and simple to use. Listed in this

data sheet are a family of standard inductors and flyback

transformers designed to work with these switching regula-

tors.

n Soft-start function reduces in-rush current during start-up

n Output switch protected by current limit, under-voltage

lockout, and thermal shutdown

Included on the chip is a 3.0A NPN switch and its associated

protection circuitry, consisting of current and thermal limiting,

and undervoltage lockout. Other features include a 52 kHz

fixed-frequency oscillator that requires no external compo-

nents, a soft start mode to reduce in-rush current during

start-up, and current mode control for improved rejection of

input voltage and output load transients.

Typical Applications

n Simple boost regulator

n Flyback and forward regulators

n Multiple-output regulator

Typical Application

DS011468-1

Note: Pin numbers shown are for TO-220 (T) package.

Ordering Information

Temperature

Range

Package

Type

Output Voltage

15V

NSC

12V

ADJ

Package Package

Drawing

−40˚C ≤ T_A≤ +125˚C 24-Pin Surface Mount

16-Pin Molded DIP

LM2577M-12

LM2577N-12

LM2577S-12

LM2577T-12

Flow LB03

LM2577M-15

LM2577N-15

LM2577S-15

LM2577T-15

Flow LB03

LM2577M-ADJ

LM2577N-ADJ

LM2577S-ADJ

LM2577T-ADJ

Flow LB03

M24B

N16A

TS5B

T05A

T05D

5-Lead Surface Mount

5-Straight Leads

TO-263

TO-220

5-Bent Staggered

Leads

−55˚C ≤ T_A≤ +150˚C 4-Pin TO-3

LM1577K-12/883 LM1577K-15/883

LM1577K-

ADJ/883

K04A

TO-3

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

DS011468

www.national.com

12 3 4 5 6 7...27

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LM1577_05	NSC	获取价格	SIMPLE SWITCHER㈢ Step-Up Voltage Regulator
LM1577-12	NSC	获取价格	SIMPLE SWITCHER Step-Up Voltage Regulator
LM1577-15	NSC	获取价格	SIMPLE SWITCHER Step-Up Voltage Regulator
LM15777	NSC	获取价格	SIMPLE SWITCHER-R Step-Up Voltage Regulator
LM1577-ADJ	NSC	获取价格	SIMPLE SWITCHER Step-Up Voltage Regulator
LM1577K-12	NSC	获取价格	SIMPLE SWITCHER-R Step-Up Voltage Regulator
LM1577K-12/883	NSC	获取价格	SIMPLE SWITCHER Step-Up Voltage Regulator
LM1577K-15	NSC	获取价格	SIMPLE SWITCHER-R Step-Up Voltage Regulator
LM1577K-15/883	NSC	获取价格	SIMPLE SWITCHER Step-Up Voltage Regulator
LM1577K883	NSC	获取价格	SIMPLE SWITCHER-R Step-Up Voltage Regulator