UCC2892

UCC2891, UCC2892 UCC2893, UCC2894 ą SLUS542F − OCTOBER 2003 − REVISED JULY 2009 CURRENTĆMODE ACTIVE CLAMP PWM CONTROLLER FEATURES DESCRIPTION D Low Output Jitter D Soft−Stop Shutdown of MAIN and AUX D Ideal for Active Clamp/Reset Forward, Flyback Converters D Provides Complementary Auxiliary Driver with Programmable Deadtime (Turn-On Delay) between AUX and MAIN Switches D Peak Current-Mode Control with Cycle-by-Cycle Current Limiting The UCC2891/2/3/4 family of PWM controllers is designed to simplify implementation of the various active clamp/reset switching power topologies. The UCC289x is a peak current-mode, fixedfrequency, high-performance pulse width modulator. It includes the logic and the drive capability for the auxiliary switch with a simple method of programming the critical delays for proper active clamp operation. D 110-V Input Startup Regulator on UCC2891/3 D TrueDrivet 2-A Sink, 2-A Source Outputs The UCC2891/3 includes a 110-V start-up regulator for initial start-up and to provide D Accurate Line UV and Line OV Threshold keep-alive power during stand-by. D Programmable Slope Compensation Additional features include an internal D 1.0-MHz Synchronizable Oscillator D Precise Programmable Maximum Duty Cycle D Programmable Soft Start programmable slope compensation circuit, precise DMAX limit, and a single resistor programmable synchronizable oscillator. An accurate line monitoring function also programs the converter’s ON and OFF transitions with APP...