BP3189A is a high-precision two-winding, low-PF primary-side feedback constant current driver, suitable for a full range of input voltages from 90Vac to 277Vac. The BP3189A chip uses differential sampling to detect the output voltage and demagnetization signal, which can realize two-winding isolation applications and ensure excellent OVP accuracy at the same time. The BP3189A chip adopts advanced primary-side constant current control technology. Without a secondary-side feedback loop and loop compensation capacitor, it can achieve excellent constant current characteristics, greatly saving system cost and volume.