BP85956P is a switching power supply driver chip boasting high performance, high integration, and low standby power consumption. It is applicable to Buck and Buck-Boost converter topology applications with full voltage input ranging from 85 to 265VAC. Inside BP85956P, a 650V high-voltage MOSFET, high-voltage start-up and self-power supply circuit, current sampling circuit, and output voltage sampling resistor are integrated. Through advanced control technology, it can achieve excellent constant voltage output characteristics without the need for an external VCC capacitor and loop compensation. This reduces the number of peripheral devices, saves system cost and volume, and simultaneously enhances reliability.