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BUY UC3842AL https://www.utsource.net/itm/p/1804339.html
Current Mode PWM Controller
Description: The UC3842AL is an improved version of the UC3842A, which is a high performance fixed frequency current mode PWM controller. Features: * High performance fixed frequency current mode control * Internal leading edge blanking of the current sense signal * Low start-up current * Low operating current * Internal soft-start * Internal over-temperature protection Applications: * Switching power supplies * Uninterruptible power supplies * Battery chargers * Motor control * Lighting ballasts (For reference only)