Description: UC3843AP is a high performance current mode PWM controller. Features: Internal 500kHz oscillator Low start-up current Internal soft-start Low operating current Under-voltage lockout Cycle-by-cycle current limiting Thermal shutdown Output short-circuit protection Output transistor safe-area compensation Applications: Switching power supplies Motor control Switching regulators Battery chargers Uninterruptible power supplies (UPS)(For reference only)
https://www.utsource.net/itm/p/88004.html