BUY UCC2804 https://www.utsource.net/itm/p/1431754.html
Low-Power BiCMOS Current-Mode PWM
Description: The UCC2804 is a high-performance, current-mode, fixed-frequency pulse-width modulation (PWM) controller. Features: * High-performance current-mode control * Fixed-frequency operation up to 500kHz * Internal slope compensation * Internal soft-start * Internal overcurrent protection * Internal thermal shutdown * Undervoltage lockout * Low start-up current Applications: * Switching power supplies * DC/DC converters * Motor control * Lighting control (For reference only)