Quasi resonant switching mode power supply

摘要: A switching mode power supply (SMPS) and a driving method thereof are provided. The SMPS includes block that first switch coupled to coil of primary side transformer for converting an input voltage, wherein the supplies second third secondary according operation switch; PWM signal generator determines turn-on time is determined regardless magnitude output terminal connected coil. Accordingly, screen noise due ripple can be eliminated stress on breakdown excessive reduced enable with stable driving.