BUY VIPER50 https://www.utsource.net/itm/p/367188.html
SMPS PRIMARY I.C.
Description: The VIPER50 is a monolithic integrated circuit specifically designed for off-line and DC-to-DC converter applications offering the designer a cost-effective solution with minimal external components. Features: - Low start-up current - Low operating current - Internal thermal shutdown - Internal soft start - Internal current limit - Internal frequency compensation - Internal oscillator - Internal leading edge blanking Applications: - Switching power supplies - DC-to-DC converters - Battery chargers - Uninterruptible power supplies - Lighting ballasts - Motor control applications (For reference only)