标签: pulse-width

Buildageneral-purposepulse-widthmodulatorusingthreeopampsfromaquad-op-ampdevice.……

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……

Abstract:ThisLED-drivercircuitproducesa500HzPWMsignalwith2%nonlinearityanddutycycleadjustablefrom0to100%,usinga0V-to-5VDCcontrolsignal.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……

三个运算放大器的一般用途的脉冲宽度调制器。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……

建立一个通用的脉冲宽度调制器，从四运放器件使用三个运算放大器。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……

摘要：添加看门狗保护的充电器的输入电路免受损害了手机卫士，当基带处理档或停止软件的执行。Maxim>AppNotes>BATTERYMANAGEMENTMICROPROCESSORSUPERVISORCIRCUITSKeywords:mobilephones,batterycharging,microprocessorsupervisors,pulse-widthmodulation,watchdogSep16,2005protectionAPPLICATIONNOTE3623Battery-ChargerPWMInputHasWatchdogProtectionAbstract:Addingwatchdogprotectiontothecharger-inputcircuitryofamobilephoneguardsagainstdamagewhenthebasebandprocessorstallsorceasessoftwareexecution.Mobile-phonebatteriesareusuallychargedthroughaproprietarychargingalgorithminthebasebandcontroller.Thephone'schargerinputisconnectedtotheinternalbatterythroughap-channelswitchoflowon-resistance,controlledbyapulse-widthmodulation(PWM)signalfromthebasebandcontroller(Figure1).Tominimizepowerdissi……

摘要：提到的EMI所有的电子系统，其中包括开关稳压器发出的有害电磁辐射。采用扩频脉冲宽度调制控制计划（SSPWM）增强的EMI抑制。驾驶与伪随机噪声（PN）的外部时钟输入引脚的MAX1703DC-DC转换稳压器提供了降低EMI的扩频时钟。遍布广泛的干扰频率降低EMI的功率密度，否则集中在一个单一的时钟频率。Maxim>AppNotes>CIRCUITPROTECTIONPOWER-SUPPLYCIRCUITSKeywords:EMI,radiation,suppression,SSPWM,spread-spectrumpulse-widthmodulation,electromagneticMay28,2002interference,MAX1703,dc-dcconverter,dcdcconverters,convertorsAPPLICATIONNOTE1077DC-to-DCConverterCombatsEMIAbstract:UnwantedelectromagneticradiationreferredtoasEMIisemittedbyallelectronicsystems,includingswitchingregulators.Adoptingspread-spectrumpulse-widthmodulation(SSPWM)asacontrolschemeenhancesthesuppressionofEMI.DrivingtheexternalclockinputpinoftheMAX1703DC-DCconverterwithapseudo-randomnoise(PN)providestheregulatorwithaspreadspectrumclockthatreducesEMI.SpreadingtheinterferencefrequenciesoverawiderangelowerstheEMIpowerd……

摘要：数字脉冲宽度调制（PWM）输出许多微处理器是基于一个内部8-或16位计数器和功能可编程的占空比。这是适合调整LCD驱动器，负电压LED驱动器，或电流控制的LED驱动器的输出。Maxim>AppNotes>DisplaydriversKeywords:pulse-widthmodulation,PWM,LEDdrivers,LCDdrivers,Sep20,2004APPLICATIONNOTE3326PWMsetsoutputofLCD/LEDdriverAbstract:Thedigital,pulse-width-modulation(PWM)outputavailablefrommanymicroprocessorsisbasedonaninternal8-or16-bitcounterandfeaturesaprogrammabledutycycle.ItissuitableforadjustingtheoutputofanLCDdriver,anegative-voltageLEDdriver,oracurrent-controlledLEDdriver.ThisdesignideaappearedintheMay27,2004issueofElectronicDesignmagazine.Thedigital,pulse-width-modulation(PWM)outputavailablefrommanymicroprocessorsisbasedonaninternal8-or16-bitcounterandfeaturesaprogrammabledutycycle.Itissuitable……

摘要：一个普通的LED的亮度控制电路采用电控电位器（EPOT）实现数字控制LED亮度。然而，更换一个RC网络的EPOT减少IC的数量和所需数量的控制线。Maxim>AppNotes>DisplayDriversKeywords:PWM,pulse-widthmodulation,LEDbrightnesscontrol,LEDcurrentregulator,LEDdriverJul19,2006APPLICATIONNOTE3866Low-PowerPWMOutputControlsLEDBrightnessAbstract:Acommonbrightness-controlcircuitforLEDsusesanelectricallycontrolledpotentiometer(EPOT)toachievedigitalcontroloftheLEDbrightness.ReplacingtheEPOTwithanRCnetwork,however,reducesboththeICcountandtherequirednumberofcontrollines.AsysteminwhichamicrocontrollerorprogrammablelogiccontrolsoneormoreLEDsoftenrequiresthecapabilityofcontrollingLEDbrightness.Acommonapproachforachievingthisadjustsanelectricallycontrolledpotentiometer(EPOT),whichinturn,controlstheLEDdr……

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……

摘要：32分路、线性锥度的数字电位器作为可变电阻器的电压分压器，连接到DIM（操作系统作为电磁的PWM驱动程序）的LED驱动程序的输入。电路驱动器螺线管从6V直流至40V直流，使用只电磁6V40V直流源等。Maxim>AppNotes>DigitalPotentiometersDisplayDriversLEDLightingKeywords:proportional-controlsolenoids,LEDdrivers,solenoiddrivers,digitalpotentiometers,pulse-widthmodulation,PWMNov05,2010APPLICATIONNOTE4503DriverProvidesProportionalSolenoidControlWithoutPLCorCBy:PhillLeyvaRobertBrewerAbstract:A32-tap,linear-taperdigitalpotentiometeractsasavariableresistorinavoltagedivider,connectedtotheDIMinputofanLEDdriver(operatingasaPWMdriverforthesolenoid).Thecircuitdrivessolenoidsrangingfrom6VDCupto40VDC,usingonlythesolenoid's6Vto40VDCsource.AsimilarversionofthisarticleappearedintheAugust14,2008issueofElectronicDesignmagazine.Theproportional-controlsolenoidsfoundinsomeindustr……