L5991_01 STMICROELECTRONICS [STMicroelectronics], L5991_01 Datasheet

L5991_01

Manufacturer Part Number

L5991_01

Description

PRIMARY CONTROLLER WITH STANDBY

Manufacturer

STMICROELECTRONICS [STMicroelectronics]

Datasheet

1.L5991_01.pdf (23 pages)

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Download datasheet (416Kb)

DESCRIPTION

This primary controller I.C., developed in BCD60II

technology, has been designed to implement off

BLOCK DIAGRAM

August 2001

CURRENT-MODE CONTROL PWM

SWITCHING FREQUENCY UP TO 1MHz

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% MAXIMUM DUTY CYCLE LIMIT

STANDBY FUNCTION

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

PACKAGE: DIP16 AND SO16

ISEN

RCT

DIS

2.5V

1.2V

OVER CURRENT

DIS

PRIMARY CONTROLLER WITH STANDBY

BLANKING

TIMING

SYNC

PWM

SOFT-START

FAULT

SGND

DC-LIM

15V/10V

25V

VREF OK

CLK

DIS

line or DC-DC power supply applications using a

fixed frequency current 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

Standby function for oscillator frequency reduction

when the converter is lightly loaded.

MULTIPOWER BCD TECHNOLOGY

ORDERING NUMBERS: L5991/L5991A (DIP16)

COMP

PWM UVLO

DIP16

E/A

Vref

2.5V

STAND-BY

VREF

13V

D97IN725A

L5991D/L5991AD (SO16)

VREF

SO16

L5991A

OUT

PGND

ST-BY

VFB

L5991

1/23

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