DW8501-Prelim-090414-Datasheet

April.2009(Rev0.6)-1-DW8501HighPowerLEDDriver•Constantoutputcurrentinvarianttosupplyandloadvoltagechange•5Vto40Vsupplyvoltage•Upto1.5Aadjustableregulatedoutputcurrent•Built-inthermalderatingcircuit•AvailablePWMdimmingcontrol•Outputcurrentadjustedthroughanexternalresistor•TO-252,SOT-223PackageTheDW8501isaninstantOn/OffLEDdriverforhighpowerLEDapplications.AtDW8501outputstage,oneregulatedcurrentportisdesignedtoprovideauniformandconstantcurrentsinkfordrivingLEDswithinalargerangeofVFvariations.DW8501easilyprovidesusersaconsistentcurrentsource.Usermayadjusttheoutputcurrentfromupto1.5Athroughanexternalresistor,RS,whichgivesusersflexibilityincontrollingthelightin-tensityofLEDs.Inaddition,userscanpreciselyadjustLEDbrightnessfrom0%to100%viaoutputen-able(EN)withPulseWidthModulation.DW8501alsoguaranteesthatLEDscanbecascadedtomaximum40Vattheoutputport.ApplicationsTypicalApplicationCircuitDescriptionsPackageInformationOrderingInformationDeviceMarkingPackageOperatingTempDW8501DW8501XXXXXXXXYWWTO-252DW8501DW8501XXXXXXXXYWWSOT-223-35OC~+85OCPackageSizeTO-252-5L6.5x5.5x2.3(mm)SOT-223-5L6.5x3.5x1.8(mm)Features•LEDlightbulbs•SignageanddecorativeLEDlighting•Generallightingofflatpaneldisplays•RGBbacklightingLEDdriver•CurrentstabilizerwithDC/DCorAC/DC•Automotivelighting•GeneralpurposeconstantcurrentsourceApril.2009(Rev0.6)-2-DW8501HighPowerLEDDriver(Rev0.6)-3-DW8501HighPowerLEDDriver℃/WSOT-223-5LθJA100℃/WOperatingtemperatureTOPR-35~+85℃StorageTemperatureTSTG-55~+150℃PackagethermalresistanceRecommendedOperationConditionsCharacteristicsSymbolMin.Typ.Max.UnitSupplyvoltageVDD5-40VEnablevoltageVEN--40VOutputsinkcurrentIOUT--1.5ANote1.θjaismeasuredintheconvectionatTa=25℃onahigheffectivethermalconductivitytestboard(4Layers,2S2P)ofJEDEC51-7thermalmeasurementstandard.April.2009(Rev0.6)-4-DW8501HighPowerLEDDriver=24V,ISET=300mA,--3VOutputcurrentIOUT0.3-1.5AQuiescentCurrentIQ_ONEN=24V-1.5-mAIQ_OFFEN=0V-150-uAENinputleakagecurrentIEN_LIK--60uAInputhighvoltageVIH2--VInputlowvoltageVIL--0.8VLEDoutputdrop-outvoltageVDROPVDD=40V,ISET=1A-1-VThermalderatingTD-140-℃ThermalderatinghysteresisTDHYS-15-℃RsetVoltageVSET0.5320.610.703VRSET2KΩ300mA1KΩ600mA600Ω1000mA400Ω1500mAVDD=24V,EN=0~24V,Ta=-35℃~+85℃,unlessotherwisespecified.TypicalvaluesareatTA=+25℃Note2:Outputdropoutvoltage:90%xIOUTApril.2009(Rev0.6)-5-DW8501HighPowerLEDDriver[mA]=(610(mV)/Rset(̔))X1000Theoutputcurrentofeachchannel(IOUT)issetbyanexternalresistor,RS.Theoutputcurrentcanbecal-culatedfromtheequation:VR-EXT=0.62V;REXT=(VR-EXT/IOUT)X1000=(0.61V/IOUT)X1000,IOUT=(VR-EXT/REXT)X1000=(0.61V/REXT)X1000within±5%chipskewwhereREXTistheresistanceoftheex-ternalresistorconnectedtoR-EXTterminalandVR-EXTisthevoltageofR-EXTterminal.April.2009(Rev0.6)-6-DW8501HighPowerLEDDriver=5VFigure2.VDD=12VFigure3.VDD=24VFigure4.VDD=12V,9LEDFigure5.PWMTypicalApplication※LEDVF=3.3V,1WPowerLEDENOUTVDDRSGNDRSETVDD=5VC1=2.2uFFigure6.RVALLASTApplicationApril.2009(Rev0.6)-7-DW8501HighPowerLEDDriver(TO-252-5L6.5x5.5x2.3)April.2009(Rev0.6)-8-DW8501HighPowerLEDDriver(SOT-223-5L6.5x3.5x1.8)