®
L5993
CONSTANT POWER CONTROLLER
CURRENT-MODE CONTROL PWM SWITCHING FREQUENCY UP TO 1MHz LOW START-UP CURRENT (< 120µ...
®
L5993
CONSTANT POWER CONTROLLER
CURRENT-MODE CONTROL PWM SWITCHING FREQUENCY UP TO 1MHz LOW START-UP CURRENT (< 120µA) CONSTANT OUTPUT POWER VS. SWITCHING FREQUENCY HIGH-CURRENT OUTPUT DRIVE SUITABLE FOR POWER
MOSFET (1A) FULLY LATCHED PWM LOGIC WITH DOUBLE PULSE SUPPRESSION PROGRAMMABLE DUTY CYCLE 100%AND 50% MAXIMUM DUTY CYCLE LIMIT PROGRAMMABLE SOFT START PRIMARY OVERCURRENT FAULT DETECTION WITH RE-START DELAY PWM UVLO WITH HYSTERESIS IN/OUT SYNCHRONIZATION LATCHED DISABLE INTERNAL 100ns LEADING EDGE BLANKING 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 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 ”constant power” function for cotrolling throughput power in multisync monitor SMPS.
VCC 8
VREF 4
25V + 15V/10V PWM UVLO
Vref
DC
3
DIS
14
9
VC
13V S R
PWM
10
OUT
Q
OVER CUR...