L5993 datasheet(1/22 Pages) STMICROELECTRONICS

No. de pieza	L5993

Descripción Electrónicos	CONSTANT POWER CONTROLLER

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

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L5993

CONSTANT POWER CONTROLLER

CURRENT-MODE CONTROL PWM

SWITCHING FREQUENCY UP TO 1MHz

LOW START-UP CURRENT (< 120

µA)

CONSTANT OUTPUT POWER VS. SWITCH-

ING FREQUENCY

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

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 SO16N

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

”constant power” function for cotrolling throughput

power in multisync monitor SMPS.

July 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

D97IN765

VFB

PGND

OUT

VC

OVER CURRENT

+

-

16

C-POWER

BLOCK DIAGRAM

ORDERING NUMBERS: L5993 (DIP16)

L5993D (SO16)

MULTIPOWER BCD TECHNOLOGY

DIP16

SO16N

1/22

Número de pieza similar - L5993

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