DAP002
DESCRIPTION
This primary controller I.C., developed in BCD60II technology, has been designed to implement off
BLOCK DIAGRAM
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.
2 RCT
+
- 14 DIS
- DIS
+
2.5V
ISEN SS
OVER CURRENT 13
+ 1.2V 7
1V
SYNC 1 TIMING
DC-LIM 15
VCC 8
25V +
15V/10V
- Vref PWM UVLO
VREF 4
9 VC
BLANKING
FAULT SOFT-START
2R R
12 SGND
SQ...
