BUY UC2854ADW https://www.utsource.net/itm/p/1047486.html
ADVANCED HIGH-POWER FACTOR PREREGULATOR
Description: The UC2854ADW is a current-mode PWM controller with an internal oscillator. Features: - High-performance current-mode PWM controller - Internal oscillator - Low start-up current - Low shutdown current - Internal soft-start - Internal leading-edge blanking - Over-voltage protection - Under-voltage lockout - Over-temperature protection Applications: - Switching power supplies - Motor control - Battery chargers - Uninterruptible power supplies (For reference only)