单 IC 脉宽调制器有 2%的线性度

摘要：此LED驱动电路产生500HzPWM信号与2%非线性和责任周期可调从0到100%，使用0V-5VDC控制信号。

Maxim>DesignSupport>AppNotes>AmplifierandComparatorCircuits>APP4502Maxim>DesignSupport>AppNotes>DisplayDrivers>APP4502Keywords:LEDdrivers,LEDdimming,pulse-widthmodulation,PWM,dualcomparatorsAug10,2010APPLICATIONNOTE4502Single-ICPWMModulatorHas2%LinearityBy:AhmadAyarAbstract:ThisLED-drivercircuitproducesa500HzPWMsignalwith2%nonlinearityanddutycycleadjustablefrom0to100%,usinga0V-to-5VDCcontrolsignal.AsimilarversionofthisarticleappearedintheAugust28,2008issueofElectronicDesignmagazine.SomeLED-drivercircuitsachievedimmingbyapplyingavariabledutycycle(PWM)totheLED