BUY SG3845N https://www.utsource.net/itm/p/1253937.html
Current Mode PWMs; Package: DIP;
Description: The SG3845N is a high performance fixed frequency current mode PWM controller. Features: - Internal oscillator with frequency range up to 500kHz - Internal soft start - Low start-up current - Internal leading edge blanking - Internal slope compensation - Internal temperature compensation - Over temperature protection - Under voltage lockout Applications: - Switching power supplies - DC-DC converters - Motor control (For reference only)