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BUY L4981B https://www.utsource.net/itm/p/858830.html
POWER FACTOR CORRECTOR
The L4981B is a monolithic integrated circuit designed for use in off-line switching power supplies. It is a fixed frequency, current mode, PWM controller. Features: * Internal startup circuit * Internal soft start * Internal oscillator * Internal over-current protection * Internal thermal shutdown * Internal under-voltage lockout * Internal over-voltage protection * Internal short-circuit protection Applications: * Switching power supplies * AC/DC converters * DC/DC converters * Battery chargers (For reference only)