BP3176BF is an isolated low PF dimmable LED driver suitable for flyback circuits. It supports PWM and analog dimming signals and full-range analog dimming, enabling high-precision, flicker-free lighting. The flyback circuit controlled by BP3176BF operates in the critical conduction and quasi-resonant modes of inductive current, thereby achieving higher conversion efficiency and lower electromagnetic interference (EMI) and improving the utilization rate of the transformer. BP3176BF adopts an advanced primary-side sampling constant current algorithm, which can achieve excellent line regulation and load regulation. At the same time, it eliminates the secondary-side feedback components and simplifies the BOM quantity and system cost.