BP3368F is a high-performance two-stage architecture constant current control chip applied to medium and high-power LED lighting. A single chip can realize the combined control of boost PFC and isolated Flyback constant current. BP3368F can achieve high PF and high-precision constant current output in the full voltage range and realize flicker-free lighting. The two-stage switching power supplies controlled by the BP3368F chip both operate in the critical conduction and quasi-resonant modes of inductive current, thereby achieving higher conversion efficiency and lower electromagnetic interference (EMI).