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廬

L5993

CONSTANT POWER CONTROLLER

CURRENT-MODE CONTROL PWM

SWITCHING FREQUENCY UP TO 1MHz

LOW START-UP CURRENT (< 120

碌

A)

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

BLOCK DIAGRAM

SYNC

1

RCT

2

TIMING

+

-

-

+

2.5V

C-POWER

16

+

-

BLANKING

T

DIS

DC-LIM

15

MULTIPOWER BCD TECHNOLOGY

DIP16

SO16N

ORDERING NUMBERS:

L5993 (DIP16)

L5993D (SO16)

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

鈥漜onstant power鈥?function for cotrolling throughput

power in multisync monitor SMPS.

V

CC

8

VREF

4

25V

+

15V/10V

-

PWM UVLO

Vref

DC

3

DIS

14

9

V

C

13V

S

R

PWM

10

OUT

Q

OVER CURRENT

ISEN

13

+

1.2V

7

2R

1V

R

-

FAULT

SOFT-START

VREF OK

CLK

DIS

11

PGND

SS

+

E/A

2.5V

-

5

VFB

12

SGND

6

COMP

D97IN765

July 1999

1/22

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