Pulse-Width Modulator Operates at Various Levels of Frequency and Power

Abstract:Buildageneral-purposepulse-widthmodulatorusingthreeopampsfromaquad-op-ampdevice.Maxim/Dallas>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSAUTOMOTIVEKeywords:pulse-widthmodulation,PWM,pulsewidthmodulator,integrator,comparator,triangle-waveApr23,2004generatorAPPLICATIONNOTE3201Pulse-WidthModulatorOperatesatVariousLevelsofFrequencyandPowerBuildageneral-purposepulse-widthmodulatorusingthreeopampsfromaquad-op-ampdevice.Themanyapplicationsforpulse-widthmodulation(PWM)includevoltageregulation,power-levelcontrol,andfan-speedcontrol.APWMcircuitforsuchapplications(Figure1)canbeimplementedwiththreeopampsfromasinglequad-op-ampchip.Theuseofopampsallowsawidevarietyofapplications.Low-poweropampscanbeusedinalow-powersystem,forexample,andhigh-frequencyopampscanbe