BP85924DA is a switching power supply driver chip with high performance, high integration, and low standby power consumption. It is suitable for buck and buck-boost converter topology applications with full voltage 85-265VAC input. BP85924DA internally integrates a 650V high-voltage MOSFET, high-voltage start-up and self-powered circuit, current sampling circuit, and voltage feedback circuit. Adopting advanced control technology, it can achieve excellent constant voltage output characteristics without external VCC capacitors and loop compensation, greatly reducing the number of peripheral devices, saving system cost and volume, and improving reliability.