L4990 Datasheet PDF | STMicroelectronics

STMicroelectronics L4990

This primary controller I.C., developed in BCD60II technology, has been designed to implement off BLOCK DIAGRAM SYNC 1 RCT 2 TIMING 25V DC-LIM 15 MULTIPOWER BCD TECHNOLOGY DIP16 SO16W ORDERING NUMBERS: L4990/L4990A(DIP16) L4990D/L4990AD (SO16W) line or DC-DC power supply applications using a fixed frequency current mode control.

Part No.	L4990
Datasheet	L4990 Download
Manufacturer	STMicroelectronics
Description	PRIMARY CONTROLLER
Buy	Stock & Price

DESCRIPTION

Based on a standard current mode PWM controller this device includes some features 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 (typ) leading edge blanking on current sense, pulse by pulse current limit and overcurrent protection with soft start intervention. VCC 8 VREF 4 3 DC 14 DIS 2.5V + + T DIS Vref + 16V/10V - PWM UVLO 9 VC 13V BLANKING S R PWM 10 OUT Q OVER CURRENT ISEN 13 + FAULT SOFT-START VREF OK CLK DIS 11 PGND SS 7 1.2V 2.5V + E/A 2R 1V R 12 SGND 6 COMP - 5 VFB D98IN1002 July 1999 1/24 L4990 - L4990A

ABSOLUTE MAXIMUM RATINGS

Symbol VCC IOUT Parameter Supply Voltage (ICC < 50mA) (*) Output Peak Pulse Current Analog Inputs & Outputs (6,7) Analog Inputs & Outputs (1,2,3,4,5,15,14 13) Power Dissipation @ Tamb = 70°C Junction Temperature, Operating Range Storage Temperature, Operating Range Value selflimit 1.5 -0.3 to 8 -0.3 to 6 1 -25 to 125 -55...