BUY L6561 https://www.utsource.net/itm/p/11203324.html
IC PFC CTRLR TRANSITION 8DIP
The L6561 is a monolithic integrated circuit manufactured by STMicroelectronics. It is a high voltage, current mode, pulse width modulation (PWM) controller designed for off-line and DC-to-DC converter applications. Features: High voltage capability: 600V Low start-up current: 0.5mA Internal fixed frequency oscillator High frequency operation: up to 500kHz Internal soft start Internal temperature protection Internal current limit Internal short-circuit protection Internal over-voltage protection Internal under-voltage lockout Internal over-temperature protection Applications: Switching power supplies DC-DC converters Uninterruptible power supplies Battery chargers Motor control Lighting control (For reference only)