BP85223AL 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 input of 85-265VAC. The BP85223AL chip integrates a 1600V rectifier diode, a 550V high-voltage MOSFET, a high-voltage start-up and self-power supply circuit, a current sampling circuit, a voltage feedback circuit and a freewheeling diode. By adopting advanced control technology, it can achieve excellent constant voltage output characteristics without external VCC capacitor and loop compensation, greatly reducing the number of peripheral devices, lowering system cost and volume, and improving reliability.