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L5991A Datasheet(PDF) 1 Page - STMicroelectronics |
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L5991A Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 19 page L5991 L5991A PRIMARY CONTROLLER WITH STANDBY CURRENT-MODE CONTROL PWM SWITCHING FREQUENCY UP TO 1MHz LOW START-UP CURRENT (< 120 µA) 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 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 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. August 1999 ® + - + - TIMING 2 3 + - 14 T Vref CLK 2.5V + - 1.2V 13 BLANKING PWM FAULT SOFT-START R SQ 25V 15V/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 D97IN725A VFB PGND OUT VC OVER CURRENT STAND-BY ST-BY VREF 16 BLOCK DIAGRAM ORDERING NUMBERS: L5991/L5991A (DIP16) L5991D/L5991AD (SO16) MULTIPOWER BCD TECHNOLOGY DIP16 SO16 1/23 |
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