Home

E-L5991A| Datasheet

By datasheet - April 3rd, 2008

E-L5991A, E-L5991AD, L5991, L5991A, L5991AD, L5991AD13TR, L5991D, L5991D013TR

Datasheet preview, take a look at Datasheets before downloading (Data Sheet is available on manufacturer site)


L5991 L5991A
PRIMARY CONTROLLER WITH STANDBY

CURRENT-MODE CONTROL PWM SWITCHING FREQUENCY UP TO 1MHz LOW START-UP CURRENT (< 120uA) HIGH-CURRENT OUTPUT DRIVE SUITABLE FOR POWER MOSFET (1A) FULLY LATCHED PWM LOGIC WITH DOUBLE PULSE SUPPRESSION PROGRAMMABLE DUTY CYCLE 100% AND 50% MAXIMUM DUTY CYCLE LIMIT STANDBY FUNCTION PROGRAMMABLE SOFT START PRIMARY OVERCURRENT FAULT DETECTION WITH RE-START DELAY PWM UVLO WITH HYSTERESIS IN/OUT SYNCHRONIZATION LATCHED DISABLE INTERNAL 100ns LEADING EDGE BLANKING OF CURRENT SENSE PACKAGE: DIP16 AND SO16 DESCRIPTION This primary controller I.C., developed in BCD60II technology, has been designed to implement off BLOCK DIAGRAM
SYNC 1 RCT 2 TIMING 25V DC-LIM 15

MULTIPOWER BCD TECHNOLOGY

DIP16

SO16

ORDERING NUMBERS: L5991/L5991A (DIP16) L5991D/L5991AD (SO16)

line or DC-DC power supply applications using a fixed frequency current mode control. Based on a standard current mode PWM controller 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, overcurrent protection with soft start intervention, and Standby function for oscillator frequency reduction when the converter is lightly loaded.

VCC 8

VREF 4

DC

3

+ T DIS

Vref +

15V/10V

-

PWM UVLO 9 VC

DIS

2.5V 13V BLANKING S R
PWM

OVER CURRENT ISEN 13 + FAULT SOFT-START

SS

1.2V 7

August 2001

+ 10 OUT Q
VREF OK CLK DIS

-

14

VREF

11 16

PGND ST-BY

STAND-BY +
E/A

2.5V

2R 1V R 12 SGND 6 COMP

-

5

VFB

D97IN725A

1/23


E-L5991A Datasheet st Download PDF

Add this permalink to your bookmarks for future download of E-L5991A datasheet

Permalink: http://datasheet.emcelettronica.com/st/E-L5991A

-->