L4990AD datasheet(1/24 Pages) STMICROELECTRONICS

部件名	L4990AD

功能描述	PRIMARY CONTROLLER

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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L4990

L4990A

PRIMARY CONTROLLER

CURRENT-MODE CONTROL PWM

SWITCHING FREQUENCY UP TO 1MHz

LOW START-UP CURRENT < 0.45mA

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

DISABLE LATCHED

INTERNAL 100ns LEADING EDGE BLANK-

ING OF CURRENT SENSE

PACKAGE: DIP16 AND SO16W

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 as pro-

grammable soft start, IN/OUT synchronization,

disable (to be used for over voltage protection

and for power management), precise maximum

Duty Cycle Control, 100ns (typ) leading edge

blanking on current sense, pulse by pulse current

limit and overcurrent protection with soft start in-

tervention.

July 1999

®

+

-

+

-

TIMING

2

3

+

-

14

T

Vref

CLK

2.5V

+

-

1.2V

13

BLANKING

PWM

FAULT

SOFT-START

R

SQ

25V

16V/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

D98IN1002

VFB

PGND

OUT

VC

OVER CURRENT

BLOCK DIAGRAM

ORDERING NUMBERS: L4990/L4990A(DIP16)

L4990D/L4990AD (SO16W)

MULTIPOWER BCD TECHNOLOGY

DIP16

SO16W

1/24

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