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BUY TOP221YN https://www.utsource.net/itm/p/1110135.html
IC SW PWM OFF-LINE 7/12W TO220
Description: TOP221YN is a high performance, fixed frequency, current mode, PWM (pulse width modulation) controller. Features: High efficiency Low standby power Internal soft start Over temperature protection Over voltage protection Under voltage protection Short circuit protection Over current protection Over load protection Internal compensation Internal oscillator Internal current limit Internal slope compensation Internal thermal shutdown Low cost Applications: Switching power supplies Battery chargers AC/DC adapters DC/DC converters Motor control (For reference only)