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BUY UC3804D https://www.utsource.net/itm/p/814312.html
Single Color PI 3 Flush Mount Round Shape Type
Description: UC3804D is a high performance current mode PWM controller with a wide range of features. It is designed to provide a simple, low cost solution for controlling a variety of switched mode power supplies. Features: Wide operating voltage range of 4.5V to 40V Low start-up current of 0.7mA Programmable frequency up to 500kHz Internal soft start Over-temperature protection Over-current protection Short circuit protection Low output voltage ripple Applications: DC/DC converters Switching regulators Battery chargers Motor control LED lighting (For reference only)