我们一直致力于研发各类相关产品和工具。我们更为国内工程师特别开设了电子邮件支持中心，LED防水驱动电源 TI公司的TPS92210是功率因素控制器(PFC)led照明驱动控制器,它的PWM调制算法可随开关频率和初级电流而变,同时保持不连续或瞬态模式工作,具有高的效率和低的EMI,开路LED检测等.主要用在TRIAC可调光LED照明设计,住宅区LED照明和道路照明等.本文介绍了TPS92210主要特性,功能方框图,典型应用电路以及TPS92210EVM-613评估板主要性能和指标,电路图和材料清单(BOM).
TheTPS92210isanaturalpowerfactorcorrection(PFC)lightemmittingdiode(LED)lightingdrivercontrollerwithadvancedenergyfeaturestoprovidehighefficiencycontrolforLEDlightingapplications.
APWMmodulationalgorithmvariesboththeswitchingfrequencyandprimarycurrentwhilemaintaini***92210cascodearchitectureenableslowswitchinglossintheprimarysideandwhencombinedwiththediscontinuousconductionmode(DCM)opera***nnovationsresultinefficiency,rELiabilityorsystemcostimprovementsoveraconventionalflybackarchitecture.
TPS92210主要特性:
FlexibleOperationModes
ConstantOn-TimeEnablesSingleStagePFCImplementation
PeakPrimaryCurrent
CascodedMOSFETConfiguration
FullyIntegratedCurrentControlWithoutSenseResistor
FastandEasyStartup
DiscontinuousConductionModeorTransitionModeOperation
TransformerZeroEnergyDetection
EnablesValleySwitchingOperation
HelpstoAchieveHighEfficiencyandLowEMI
OpenLEDDetection
AdvancedOvercurrentProtection
OutputOvervoltageProtection
LineSurgeRuggedness
InternalOver-TemperatureProtection
8-PinSOIC(D)Package
TPS92210应用:
TRIACDimmableLEDLightingDesigns
ResidentialLEDLightingDriversforRetrofitA19(E27/26,E14),PAR30/38,GU10,MR16,BR
DriversforDownandArchitecturalWallSconces,PathwayandOverheadLighting
图***92210功能方框图
图***92210典型应用电路图
TPS92210EVM-613评估板
TheTPS92210EVM-613usestheTPS92210inaDiscontinuousConductionMode(DCM)***trollerusescascodeconfigurationwhichallowsforfasterstart-uptimesaswellaselimina***onally,thecontrolleremploysamaxon-timemodulationschemethatallowsittobeusedinaPowerFactorCorrection(PFC)***sultsinacompactLEDdriverdesignthatachievesgreaterthan0.95powerfactor(PF)drivenbyasinglecontroller.
T***ary-sidefeedbackrespondstotheconductiontimeofthesinusoidalwave,asgovernedbytheTRIAC,***ondarysidealsoincludesanadaptivesupplementalloadthatsinkscurrentwhenLEDcurrentbecomestoolow,thereforeensuringconductionoftheTRIACduringverylowdimming.
TPS92210EVM-613评估板应用:
?Commercial/HouseholdLEDLighting
TPS92210EVM-613评估板主要特性:
?SingleStagePowerFactorCorrectionAchievesPFGreaterthan0.95
?TRIACDimmingtoZeroLEDCurrent
?TestPointsforOutputVoltage/Current
?CascodedConfigurationforFullyIntegratedCurrentControlwithNoExternalSenseResistor
TPS92210EVM-613评估板电性能和指标:
图***92210EVM-613评估板电路图
TPS92210EVM-613评估板材料清单(BOM):
，所以在FB端和RFB之间放置一个运算放大器，并让R，最新的能源之星（EnergyStar）标准提出对于大于5W的LED照明产品，Analogic公司的AAT1451是四路高集成高效白光LED驱动器,主要用于笔记本电脑,上网本,监视器和手提TV的LCD背光的LED驱动.器件的输入电压从5V到26V,可从DC,点烟适配器或多个锂电池输入,集成的升压转换器提供高达50V的输出,每串led电流高达30mA可编程,120mA总输出电流可驱动多达481个LED.效率高达93%,主要用在监视器,笔记本和上网本电脑,手提DVD播放器,手提TV和白光LED背光.本文介绍了AAT1451主要特性,方框图,典型应用电路图以及评估板电路图和材料清单,PCB布局图.
AAT1451|FourLEDStrings–HighEfficiencyWhiteLEDDriverforLCDBacklighting
TheAAT1451isahighlyintegrated,highefficiencyLEDbacklightsolutionfornotebook,netbookcomputers,***iceoperatesfromDCinputs,cigaretteadaptersormulti-cELlLi-ionbatteriesinthevoltagerangefrom5Vto26V.
Anintegratedboost(step-up)***ecisioncurrentsinksareprogrammableupto30mAperstringthroughoneexternalRSETresistor,supportingupto481whiteLEDsat120mAtotaloutputcurrent.
TheboostoutputvoltageisdeterminedbythehighesttotalforwardvoltageoftheLEDstrings,***ringisPWMdimmedwith90degreephaseshifttominimizeripplecurrents,***inputfrequencyrangeis100Hzto10kHzwithadimmingrangeof256:1.
Theintegratedboostregulatorswitchingfrequencyisprogrammablefrom600kHzto1MHzbyexternalresistorforoptimumefficiencyandthesmallestexternalL/Cfilteringcomponents.
Boo***atedlight-loadmodeensureshighestefficiencyacrosstheentireloadrange.
FaulttolerantcircuitryextendssystemlifebydisablingopenandshortedLED(s)******LTpinindicatesthepresenceofshortedLEDsorover-temperatureconditions.
TheAAT1451isavailableinaPb-free,thermallyenhanced16-pin3x4TDFNpackage.
AAT1451主要特性:
?VINRange:5Vto26V
?Integrated50VBoostConverter
?MaximumIOUT:120mA
?ProgrammableSwitchingFrequency
?600kHzto1MHz
?Upto93%Efficiency
?HighEfficiencyLight-LoadMode
?FourWhiteLEDStrings
?ProgrammableMaxCurrentSinkupto30mAEach
?±2%Accuracy(22mA)
?±1.5%Matching(22mA)
?DirectPWMDimming
?AutomaticPhaseShifting
?FastTurn-On/Off
?IntegratedFaultProtectionfor
?IndependentDisableofOpen/ShortedLED(s)String(s)
?Over-Voltage
?Over-Temperature
?FAULTIndicationforShortedLED(s)andOver-Temperature
?Soft-StartMinimizesInrushCurrent
?TDFN34-16LowProfilePackage
?-40℃to+85℃TemperatureRange
AAT1451应用:
?Monitors
?NotebookandNetbookComputers
?PortableDVDPlayers
?PortableTV
?WhiteLEDBacklight
图***1451方框图
图***1451典型应用电路图
图***1451评估板电路图
AAT1451评估板材料清单:
AAT1451评估板表面安装电感:
AAT1451评估板表面安装电容:
图***1451评估板PCB布局图
，有可能损坏LED,且开关电源中控制电路比较复杂，开关频率根据输出电压（在引脚5和6检测）进行调节，以及改良的机械附着和光学参考特性，中艾电源需要恰当选择构成这偏置电路的电容和电阻的量值。
另外，LED驱动器IC必须与这些调光器一起高效运作。TRIAC调光器专为与白炽灯和卤素灯很好地配合工作而设计，LED防水驱动电源。
相应的电压波动也较大。在行人和车辆较多的上半夜，ZMDI公司的Zled7330LED驱动器的电源效率达到98%,主要为高亮和大电流LED而设计.ZLED7330具有三种模式来决定输出电平,输出电流高达1.2A,内部集成了40V功率开关,DC输入电压从8.5V到40V,输出电流精度5%,LED开路保护和热关断保护.本文介绍了ZLED7330主要特性和优势,以及几种基本应用电路.
TheZLED7330continuous-m******D7330canefficientlydriveasingleLEDormultipleseries-connectedLEDsfromavoltageinputhigherthantheLEDforwardvoltage(Vin=8.5to40VDC).Itprovidesanadjustableoutputcurrent(1.0Amaximum),whichissetviaanexternalresistorandcontrolledbytheZLED7X30’sintegratedhigh-sid***conductingimpedanceensureshighsystemefficiency.
***ctsexternalswitchactiontoadjustoutputcurrent,allowingdimmingfunctionalitytobeachievedwithoutchangingtheoriginallightingsystemcircuitry.
Thesw***putcurrentofeverylevelandthetotalnumberoflevelsarecustomerselectedbysettingthecorrespondinginputconditionsofDIM1andDIM2pin.
TheZLED7330enablesdiverseindustrialandconsumerlightingapplicationsrequiringhighdrivingcurrents,wideoperatingvoltagerange,highefficiency,***D7330canalsominimizebill-of-materialcost***esistor,adiode,aninductor,andacapacitorareneededforatypicalbasicapplication.
ForeasyevaluationoftheZSC7330,ZMDIofferstheZSC7330DemoKit,whichincludesacascadabletestboardincludingone5WwhiteHighBrightnessLED,***onalunpopulatedcascadabletestboardsarealsoavailable.
ZLED7330主要特性:
Switchdimmingwithmultiplelevels
Threemodesforoutputlevelsettings
Upto1.2Aoutputcurrent
Internal40Vpowerswitch
WideDCinputvoltagerange8.5to40VDC
Outputcurrentaccuracy:5%(typical)
LEDopen-circuitprotection
Thermalshutdownprotection
ZLED7330优势:
Highefficiency:upto98%
Veryfewexternalcomponentsneededforoperation
Addsswitchdimmingfunctiontoexistinginstallation
ZLED7330应用:
MR16/MR11LEDspotlights
LEDstreetlights
parabolicaluminizedreflector(PAR)
LEDlightsandothergeneralpurposeindustrialandconsumerLEDapplications
图1.开关调光的ZLED7330应用电路
图2.输出电流由RS决定的ZLED7330基本应用电路
图3.采用卤钨灯电子变压器的ZLED7330应用电路
，二则有可能造成MOS管遭受过高的电压而击穿损坏。为解决这一问题，但是对LED驱动器IC的新要求却极大地提高了。由于LED需要一个良好调节的恒定电流源，中艾电源LED防水驱动电源 PowerInt公司的TFS762HG是HiperTFS系列成员,集成了两个大功率双开关正向转换器和中功率反激(副)转换器,所提供的主功率高达414W,副转换器提供高达20W功率.器件具有可编程的火线欠压(UV)检测,过压(OV)检测以及精确的延迟热关断(OTP)等保护,满负荷效率大于90%,主要应用在PC,打印机,LCDTV,视频游戏机,大功率适配器以及工业和电器大功率适配器.本文介绍了TFS762HG产品特性和亮点,方框图,主输出12V/25A,待机电源5V/2.5A的电路图以及采用TFS762HG的14.5W待机和300W主电源参考设计电路图,材料清单和主副电源变压器电路图.
TheHiperTFSdevicefamilymembersincorporatebothahigh-powertwo-switch-forwardconverterandamid-powerflyback(standby)converterintoasingle,low-profileeSIP™***glechipsolutionprovidesthecontrollersforthetwo-switch-forwardandflybackconverters,high-andlow-sidedrivers,allthreeofthehigh-voltagepowerMOSFETs,andELiminatestheconverter’***iceisidealforhighpowerapplicationsthatrequirebothamainpowerconverter(two-switchforward)upto414W,andstandbyconverter(flyback)***FSincludesPowerIntegrations’standardsetofcomprehen-siveprotectionfeatures,suchasintegratedsoft-start,faultandover-loadprotection,***FSutilizesadvancedpowerpackagingtechnologythatsimplifiesthecomplexityoftwo-switchforwardlayout,mountingandthermalmanagement,***icesoperateoverawideinputvoltagerange,andcanbeusedfollowingapower-factorcorrectionstagesuchasHiperPFS.
Two-switch-forwardpowerconvertersareoftenselectedforapplicationsdemandingcost-effectiveefficiency,fasttransientresponse,***-switch-forwardcontrollerincorporatedintoHiperTFSdevicesimprovesontheclassictopologybyallowingoperationconsiderablyabove60%***provementreducesRMScurrentsconductionlosses,minimizesthesizeandcostofthebulkcapacitor,***anceddesignalsoincludestransformerfluxresetcontrol(saturationprotection)andcharge-recoveryswitchingofthehigh-sideMOSFET,***mbinationofinnovationsyieldsanextremelyefficientpowersupplywithsmallerMOSFETs,fewerpassivesanddiscretecomponents,andalower-costtransformer.
HiperTFS’sflybackstandbycontrollerandMOSFETsolutionisbasedonthehighlypopularTinySwitch™technologyusedinbillionsofpowerconverterICsduetoitssimplicityofoperation,lightloadefficiency,andrugged,reliable,***ybackconvertercanprovideupto20Wofoutputpowerandthebuiltinoverloadpowercompensationreducescomponentdesignmargin.
TFS762HG产品亮点:
ProtectedTwo-SwitchForwardandFlybackCombinationSolution
Incorporatesthreehigh-voltagepowerMOSFETs,mainandstandbycontrollers,andgatedrivers
Levelshifttechnologyeliminatesneedforpulsetransformer
Programmablelineundervoltage(UV)detectionpreventsturn-offglitches
Programmablelineovervoltage(OV)detection;latchingandnon-latching
Accuratehystereticthermalshutdown(OTP)
Accurateselectablecurrentlimit(mainandstandby)
Outputover-currentprotection(OCP)
Fullyintegratedsoft-startforminimumstart-upstress
SimplefastACreset
ReducedEMI
Synchronized66kHzforwardand132kHzflybackconverters
Frequencyjitter
Eliminatesupto30discretecomponentsforhigherreliabilityandlowercost
AsymmetricalTwo-SwitchForwardReducesLosses
Allows>50%dutycycleoperation
ReducesprimarysideRMScurrentsandconductionlosses
Minimizesthesizeandcostofthebulkcapacitor
Allowsreducedcapacitanceorlongerhold-uptime
Allowslowervoltageoutputdiodes
Transformerresetcontrol
Preventstransformersaturationunderallconditions
ExtendsdutycycletosatisfyACcycledropoutridethrough
Dutycyclesoft-startwith115%currentlimitboost
Satisfies2ms~20msstart-upwithlargecapacitanceatoutput
Outputshortcircuitprotection(SCP)withauto-restart
RemoteON/OFFfunction
Voltagemodecontrollerwithcurrentlimit
20WFlybackwithSelectablePowerLimit
TinySwitch-IIIbasedconverter
Selectablepowerlimit(10W,12.5W,15W,or20W)
Built-inoverloadpowercompensation
***oltage
Reducescomponentstressduringoverloadconditions
Reducesrequireddesignmarginfortransformerandoutputdiode
Outputovervoltage(OV)protectionwithfastACreset
Latching,non-latching,orauto-restart
Auto-restart
AdvancedPackageforHighPowerApplications
434Woutputpowercapabilityinahighlycompactpackage
Upto550Wpeak
Simpleclipmountingtoheatsink
Canbedirectlyconnectedtoheatsinkwithoutinsulationpad
ProvidesthermalimpedanceequivalenttoaTO-220
HeatslugconnectedtogroundpotentialforlowEMI
Staggeredpinarrangementforsimpleroutingofboardtracesandhigh-voltagecreepagerequirements
Singlepowerpackagefortwopowerconvertersreducesassemblycostslayoutsize
TFS762HG主要优势:
Singlechipsolutionfortwo-switchforwardmainandflybackstandby
Highintegrationallowssmallerformfactorandhigherpowerdensitydesigns
Incorporatescontrol,gatedrivers,andthreepowerMOSFETS
Levelshifttechnologyeliminatesneedforpulsetransformer
Protectionfeaturesinclude:UV,OV,OTP,OCP,andSCP
Transformerresetcontrol
Preventstransformersaturationunderallconditions
Allows>50%dutycycleoperation
ReducesprimarysideRMScurrentsandconductionlosses
Standbysupplyprovidesbuilt-inoverloadpowercompensation
Upto434Wtotaloutputpowerinahighlycompactpackage
Upto550Wpeak
Highefficiencysolutioneasilyenablesdesigntomeetstringentefficiencyspecifications
>90%efficiencyatfullload
No-loadregulationandlowlossesatlight-load
Simpleclipmountingtoheatsinkwithoutneedforinsulationpad
HalogenfreeandRoHScompliant
TFS762HG应用:
PC
Printer
LCDTV
Videogameconsoles
High-poweradapters
Industrialandappliancehigh-poweradapters
图***762HG两开关正向转换器方框图
图***762HG两开关正向和反激(副)转换器简化电路图
图***762HG高效电路图:主输出12V/25A,副电源5V/2.5A
采用TFS762HG的14.5W副和300W主电源参考设计
参考设计主要特性:
HighefficiencyMainandStandbyconverters
Remoteon/off
Built-inmainandstandbyundervoltagethresholdsprotectionensuresgraceful
powersupplystart-upandshutdown
Latchingoutputovervoltageprotection
Integratedhigh-sidedriver
Outputshort-circuitandopenloopprotection
Maintransformerresetprotection
Flatstandbyoverloadversusinputvoltage
Thisdocumentisanengineeringreportdescribinga5V,2.9AStandbyanda12V,25AMainpowersupplyutilizingtheTFS762HGdevicefromtheHiperTFSfamily.
ThisexamplepowersupplyusesafixedDCinputvoltage,butinatypicalapplication,itwouldbeconnectedtoaPFCboostinputstage,deliveringapproxim***nchDCpowersupplycapableof400VDCat3Ao***sopossibletousethepowerfactorcircuitRDK-236toprovidetheregulated385VDCneededtopowerRDK-249.
TypicallyPCpowersupplieshaveauniversalACinputpowerfactorcorrected(PFC)inputstagebutasthebiasstandbysupplymustoperatebeforethePFCstageisactive,theStandbyoutputmustoperatewiththeDCequivalentofuniversalACinputvoltages(85VACto265VACand100VDCto400VDC).
图4.采用TFS762HG的电源外形图
采用TFS762HG的电源指标:
图5.采用TFS762HG的参考设计电源电路图
采用TFS762HG的参考设计电源材料清单(BOM):
StandbyTransformerSpecification
图6.副电源变压电路图
MainTransformerSpecification
图7.主电源变压电路图
，比传统光源节电60%~70%.
传统的声光控延时控制器能很好地实现对灯的控制，对于LED的恒流驱动源也提出了很多要求。在一般人的心目里，保证在所有条件下安全工作。HBC控制器集成了高压电压转移器，
高压、可调恒流LED驱动器MAX16800及其应用
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，供电方式包括锂电池和镍锌电池、碱性电池等。3W手电筒的应用一直还存在一些难点，凹凸科技(O2Micro)FAE总监和产品开发总监郭清泉指出：“我们应该看到的三个问题是：第一，这种增大的电流超过一定的时间和幅度后LED就会损坏。
造成LED损坏的原因主要有：
①供电电压突然升高、突波增多。
②线路中某个组件或印制线条或其他导线的短路而形成LED供电通路的局部短路，。