L5991_01 STMICROELECTRONICS [STMicroelectronics], L5991_01 Datasheet

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L5991_01

Manufacturer Part Number
L5991_01
Description
PRIMARY CONTROLLER WITH STANDBY
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet

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DESCRIPTION
This primary controller I.C., developed in BCD60II
technology, has been designed to implement off
BLOCK DIAGRAM
August 2001
CURRENT-MODE CONTROL PWM
SWITCHING FREQUENCY UP TO 1MHz
LOW START-UP CURRENT (< 120 A)
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
ISEN
RCT
DIS
DC
SS
®
2
3
14
13
7
2.5V
1.2V
OVER CURRENT
+
+
+
-
-
-
DIS
1V
PRIMARY CONTROLLER WITH STANDBY
BLANKING
TIMING
SYNC
1
T
PWM
R
SOFT-START
FAULT
SGND
2R
12
15
DC-LIM
15V/10V
25V
VREF OK
8
CLK
DIS
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.
V
CC
+
-
MULTIPOWER BCD TECHNOLOGY
ORDERING NUMBERS: L5991/L5991A (DIP16)
S
R
COMP
6
Q
PWM UVLO
DIP16
E/A
+
-
Vref
2.5V
STAND-BY
VREF
13V
D97IN725A
L5991D/L5991AD (SO16)
4
VREF
10
11
16
9
5
SO16
L5991A
V
OUT
PGND
ST-BY
VFB
C
L5991
1/23

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