L5991A

更新时间： 2024-01-06 02:49:34

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		控制器
页数	文件大小	规格书
19页	194K
描述
PRIMARY CONTROLLER WITH STANDBY

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中文翻译

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数据手册

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L5991A 数据手册

L5991

L5991A

PRIMARY CONTROLLER WITH STANDBY

CURRENT-MODE CONTROL PWM

SWITCHING FREQUENCY UP TO 1MHz

MULTIPOWER BCD TECHNOLOGY

LOW START-UP CURRENT (< 120 A)

HIGH-CURRENT OUTPUT DRIVE SUITABLE

FOR POWER MOSFET (1A)

FULLY LATCHED PWM LOGIC WITH DOU-

BLE PULSE SUPPRESSION

PROGRAMMABLE DUTY CYCLE

100%AND 50%MAXIMUMDUTY CYCLELIMIT

STANDBY FUNCTION

DIP16

SO16

PROGRAMMABLE SOFT START

PRIMARY OVERCURRENT FAULT DETEC-

TION WITH RE-START DELAY

PWM UVLO WITH HYSTERESIS

IN/OUT SYNCHRONIZATION

LATCHED DISABLE

INTERNAL 100ns LEADING EDGE BLANK-

ING OF CURRENT SENSE

ORDERING NUMBERS:

L5991/L5991A (DIP16)

L5991D/L5991AD (SO16)

line or DC-DC power supply applications using a

fixed frequencycurrent mode control.

Based on a standard current mode PWM control-

ler this device includes some features such as

programmable soft start, IN/OUT synchronization,

disable (to be used for over voltage protection and

for power management), precise maximum Duty

Cycle Control, 100ns leading edge blanking on

current sense, pulse by pulse current limit, over-

current protection with soft start intervention, and

Standbyfunction for oscillator frequencyreduction

when the converteris lightly loaded.

PACKAGE:DIP16 AND SO16

DESCRIPTION

This primary controller I.C., developed in BCD60II

technology, has been designed to implement off

BLOCK DIAGRAM

V_CC

SYNC

DC-LIM

VREF

TIMING

RCT

25V

Vref

15V/10V

PWM UVLO

DIS

V_C

2.5V

13V

OUT

BLANKING

PWM

OVER CURRENT

VREF

VREF OK

CLK

DIS

PGND

ST-BY

FAULT

SOFT-START

ISEN

STAND-BY

2.5V

1.2V

E/A

VFB

D97IN725A

SGND

COMP

1/23

August 1999

12 3 4 5 6 7...19

中文翻译

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