【摘要】 基于SinoMOS 1μm 40V CMOS工艺设计了一种具有省电模式的CMOS反激式PWM控制器,其PWM振荡器具有变频模式和间歇模式,使得整个PWM控制器系统能随负载的变轻而线性降低开关频率,并在空载状态下进入间歇模式.仿真和测试结果显示具有省电模式PWM控制器的正常工作PWM频率为65~66kHz,无负载时的PWM频率为21.7kHz,启动电流为17~18μA,正常工作电流为3.5~4.0mA,有效芯片面积为2.06mm×1.55mm,能直接实现低功耗的电源系统.更多还原

【Abstract】 Based on the SinoMOS 1μm 40V CMOS process,a CMOS flyback PWM controller with low power consumption is presented.The flyback PWM controller provides frequency conversion-mode under the light-load condition and burst-mode unde r the zero-load condition,which minimize standby power consumption and enable the power supply to meet international power conservation requirements.The PWM freq uency of the flyback PWM controller is 65-66kHz with a normal load and 21.7kHz w ith no or light load.The start operation current is 17-18μA,and the normal op eration current is 3.5-4.0mA.The active die area of the flyback PWM controller is 2.06mm×1.55mm.更多还原