BP3319MB_EN_DS_Rev 1.2 晶丰明源初级稳压 PSR Single-Stage APFC Offline LED Controller.pdf

BP3319MB PSR Single-Stage APFC Offline LED Controller Description Features The BP3319MB is a high precision primary-side ◼ Single-Stage Active PFC for High Power Factor regulation PWM controller with single stage Active and Low THD PFC, specially designed for universal input offline ◼ Primary Side Control Constant Current Operation, flyback or buck-boost constant current LED lighting. No Opto-Coupler required The controller with on-chip PFC circuit achieves high ◼ ±3% LED Current Accuracy power factor and low THD. Operating in critical ◼ Excellent Line and Load Regulation conduction mode, the power MOSFET switching loss ◼ Critical Conduction Mode Operation is reduced and the inductor is fully utilized. ◼ Ultra-Low (33uA) Startup Current ◼ High Resistance Feedback Resistor for Improved The BP3319MB adopts advanced primary side current Efficiency sensing scheme. It can precisely control the LED ◼ LED Open and Short Circuit Protection current without secondary side sense and feedback ◼ CS Resistor Open Circuit Protection circuits. The system size and cost are optimized, as ◼ Cycle-by-Cycle Current Limit we