BUY MC44608P75 https://www.utsource.net/itm/p/713536.html
Few External Components Reliable Flexible GreenLine Very High Voltage PWM Controller
Description: The MC44608P75 is a high performance, monolithic, fixed frequency, pulse width modulated (PWM) controller manufactured by Motorola. Features: High performance PWM controller Fixed frequency operation Undervoltage lockout Thermal protection Overtemperature protection Overcurrent protection Low start-up current Low operating current Low standby current Low external component count Applications: Switch mode power supplies DC-DC converters Battery chargers Motor control (For reference only)