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.
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 under the zero- load condition, which minimize standby power consumption and enable the power supply to meet international power conservation requirements. The PWM frequency of the flyback PWM controller is 65~66kHz with a normal load and 21.7kHz with no or light load. The start operation current is 17~18μA, and the normal operation current is 3.5~4. 0mA. The active die area of the flyback PWM controller is 2.06mm ×1.55mm.