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BUY UC3854QTR https://www.utsource.net/itm/p/5350289.html
Power Factor Controller
Description: The UC3854QTR is a high performance current mode PWM controller with an integrated 5V reference. Features: High performance current mode architecture Internal 5V reference Low start-up current Low operating current Internal soft-start Internal over-temperature protection Output short-circuit protection Output under-voltage protection Applications: Switching power supplies Motor control Battery chargers Uninterruptible power supplies (For reference only)