L5991A datasheet(1/19 Pages) STMICROELECTRONICS

Part #	L5991A

Description	PRIMARY CONTROLLER WITH STANDBY

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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L5991

L5991A

PRIMARY CONTROLLER WITH STANDBY

CURRENT-MODE CONTROL PWM

SWITCHING FREQUENCY UP TO 1MHz

LOW START-UP CURRENT (< 120

µA)

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

DESCRIPTION

This primary controller I.C., developed in BCD60II

technology, has been designed to implement off

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.

August 1999

®

+

-

+

-

TIMING

2

3

+

-

14

T

Vref

CLK

2.5V

+

-

1.2V

13

BLANKING

PWM

FAULT

SOFT-START

R

SQ

25V

15V/10V

VREF OK

DIS

+

-

E/A

1V

R

2R

DIS

2.5V

7

6

5

11

10

9

4

8

15

1

13V

PWM UVLO

12

SGND

COMP

SS

ISEN

DIS

DC

RCT

SYNC

DC-LIM

VCC

VREF

D97IN725A

VFB

PGND

OUT

VC

OVER CURRENT

STAND-BY

ST-BY

VREF

16

BLOCK DIAGRAM

ORDERING NUMBERS: L5991/L5991A (DIP16)

L5991D/L5991AD (SO16)

MULTIPOWER BCD TECHNOLOGY

DIP16

SO16

1/23

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