摘 要 基于AC/DC 开关电源PWM 控制芯片的工作原理，分析了其产生功耗的主要来源，提出了两种减小芯

片功耗的方法，一是采用电流源和电流沉串联方式构成的输出驱动电路，通过消除CMOS 电路的瞬态短路导通现

象，降低该电路模块的功耗；二是采用跳周工作模式，使芯片在轻载和空载情况下，降低功率开关管的开关损耗。-Abstract Based on the AC/DC switching power supply PWM control chip operating principle, analysis of its major source of generated power, we propose two ways to reduce the chip power consumption, first, the use of current sources and current Shen way constitute a series of output driver circuits, CMOS circuits by eliminating the transient short-circuit turn-on phenomenon, reducing the power consumption of the circuit module　second is the use of jump-week work pattern, so that the chip in the light load and no-load case, the lower the power switch switching losses.