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BUY L6561D https://www.utsource.net/itm/p/247941.html
POWER FACTOR CORRECTOR
Description: The L6561D is a high voltage, high frequency, current mode PWM controller. Features: High voltage capability up to 600V High frequency operation up to 500kHz Current mode control Internal soft-start Internal slope compensation Internal oscillator Over-temperature protection Over-voltage protection Under-voltage lockout Over-current protection Short-circuit protection Applications: DC/DC converters Switching power supplies Motor control LED lighting (For reference only)