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1、个人收集整理仅供参考学习基于MAX16834设计地112W升压LED驱动器技术MAX16834是Maxim公司地电流模式高亮LED(HBLED)驱动器,可用于升压,升压-降压,SEPIC和高边降压拓扑.工作电压4.75V到28V,3000:1PWM调光/模拟调光,可编频率从100kHz到1MHz,主要用在单串LEDLCD背光,汽车前后照明,投映系统RGBLED光源,点和环境照明以及DC/DC升压/升-降压转换器.本文介绍了MAX16834主要特性,方框图,多种应用电路以及112W升压LED驱动器参考设计,电路图和材料清单(BOM).TheM
2、AX16834isacurrent-modehigh-brightnessLED(HBLED)driverforboost,boost-buck,SEPIC,andhighsidebucktopologies.Inadditiontodrivingann-channelpowerMOSFETswitchcontrolledbytheswitchingcontroller,italsodrivesann-channelPWMdimmingswitchtoachieveLEDPWMdimming.TheMAX16834integratesall
3、thebuildingblocksnecessarytoimplementafixed-frequencyHBLEDdriverwithwide-rangedimmingcontrol.TheMAX16834featuresconstant-frequencypeakcurrent-modecontrolwithprogrammableslopecompensationtocontrolthedutycycleofthePWMcontroller.Adimmingdriverdesignedtodriveanexternaln-channe
4、lMOSFETinserieswiththeLEDstringprovideswide-rangedimmingcontrolupto20kHz.InadditiontoPWMdimming,theMAX16834providesanalogdimmingusingaDCinputatREFI.Theprogrammableswitchingfrequency(100kHzto1MHz)allowsdesignoptimizationforefficiencyandboardspacereduction.Asingleresistorfro
5、mRT/SYNCtogroundsetstheswitchingfrequencyfrom100kHzto1MHzwhileanexternalclocksignalatRT/SYNCdisablestheinternaloscillatorandallowstheMAX16834tosynchronizetoanexternalclock.TheMAX16834’sintegratedhighsidecurrent-senseamplifiereliminatestheneedforaseparatehigh-sideLEDcurrent
6、-senseamplifierinboost-buckapplications.TheMAX16834operatesoverawidesupplyrangeof4.75Vto28Vandincludesa3Asink/sourcegatedriverfordrivingapowerMOSFETinhigh-powerLEDdriverapplications.Itcanalsooperateatinputvoltagesgreaterthan28Vinboostconfigurationwithanexternalvoltageclamp
7、.TheMAX16834isalsosuitableforDCDCconverterapplicationssuchasboostorboostbuck.Additionalfeaturesincludeexternalenable/disableinput,anon-chiposcillator,faultindicatoroutput(FLT)forLEDopen/shortorovertemperatureconditions,andanovervoltageprotectionsenseinput(OVP+)fortrueoverv
8、oltageprotection.TheMAX16834isavailableinathermallyenhanced4mmx4mm,20-pinTQFN-EPpackagean
