BP85958P is a switching power supply driver chip with high performance, high integration and low standby power consumption. It is suitable for converter topology applications such as Buck and Buck-Boost with full voltage input of 85-265VAC. BP85958P integrates a 650V high-voltage MOSFET, high-voltage start-up and self-power supply circuit, current sampling circuit and voltage feedback circuit. By adopting advanced control technology, it can achieve excellent constant voltage output characteristics without loop compensation, greatly reducing the number of peripheral devices, saving system cost and volume, and improving reliability at the same time.