TheTPS92210isanaturalpowerfactorcorrection(PFC)lightemmittingdiode(LED)lightingdrivercontrollerwithadvancedenergyfeaturestoprovidehighefficiencycontrolforLEDlightingapplications.
APWMmodulationalgorithmvariesboththeswitchingfrequencyandprimarycurrentwhilemaintainingdiscontinuousortransitionmodeoperationinallregionsofoperation.TheTPS92210cascodearchitectureenableslowswitchinglossintheprimarysideandwhencombinedwiththediscontinuousconductionmode(DCM)operationensuresthatthereisnoreverserecoverylossintheoutputrectifier.Theseinnovationsresultinefficiency,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1.TPS92210功能方框图
图2.TPS92210典型应用电路图
TPS92210EVM-613评估板
TheTPS92210EVM-613usestheTPS92210inaDiscontinuousConductionMode(DCM)flybacktopology.Thecontrollerusescascodeconfigurationwhichallowsforfasterstart-uptimesaswellaseliminatestheneedforanexternalsenseresistorforprimary-sidecurrentsense.Additionally,thecontrolleremploysamaxon-timemodulationschemethatallowsittobeusedinaPowerFactorCorrection(PFC)circuit.ThisresultsinacompactLEDdriverdesignthatachievesgreaterthan0.95powerfactor(PF)drivenbyasinglecontroller.
TheTPS92210EVM-613isalsocompatiblewithawidevarietyofTRIACdimmers.Secondary-sidefeedbackrespondstotheconductiontimeofthesinusoidalwave,asgovernedbytheTRIAC,andappropriatelylowerstheLEDcurrenttodimtheLEDs.ThesecondarysidealsoincludesanadaptivesupplementalloadthatsinkscurrentwhenLEDcurrentbecomestoolow,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3.TPS92210EVM-613评估板电路图
TPS92210EVM-613评估板材料清单(BOM):
，可通过微控制器直接控制。
所有BCR型LED驱动器都具备负热系数，但整个市场庞大的用量累加起来导致消耗的总功率相当大，保证输出电流稳定
，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,monitorsandportableTVs.ThedeviceoperatesfromDCinputs,cigaretteadaptersormulti-cELlLi-ionbatteriesinthevoltagerangefrom5Vto26V.
Anintegratedboost(step-up)converterprovidesahighvoltageoutputupto50VfordrivingseriesLEDs.Fourprecisioncurrentsinksareprogrammableupto30mAperstringthroughoneexternalRSETresistor,supportingupto481whiteLEDsat120mAtotaloutputcurrent.
TheboostoutputvoltageisdeterminedbythehighesttotalforwardvoltageoftheLEDstrings,allowingforawiderangeofLEDcharacteristics.EachstringisPWMdimmedwith90degreephaseshifttominimizeripplecurrents,andfiltercapacitorsizes.ThePWMinputfrequencyrangeis100Hzto10kHzwithadimmingrangeof256:1.
Theintegratedboostregulatorswitchingfrequencyisprogrammablefrom600kHzto1MHzbyexternalresistorforoptimumefficiencyandthesmallestexternalL/Cfilteringcomponents.
Boostcurrentmodecontrolprovidesfastresponsetolineandloadtransients.Integratedlight-loadmodeensureshighestefficiencyacrosstheentireloadrange.
FaulttolerantcircuitryextendssystemlifebydisablingopenandshortedLED(s)strings.TheuniquehighvoltagecurrentsinkspreventdamageresultingfromshortedLEDs.TheFAULTpinindicatesthepresenceofshortedLEDsorover-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1.AAT1451方框图
图2.AAT1451典型应用电路图
图3.AAT1451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4.AAT1451评估板PCB布局图
， 一、设计特色
1、恒流输出非常适合
2、高输出电压支持一个
TheLinkSwitch-PHdramaticallysimplifiesimplementationofLEDdriversrequiringPF>0.9,TRIACdimmercapability(LNK403-409)andhighefficiency.Thesingle-stagePFandconstantcurrentcontrollereliminatespassivecircuitryrequiredforpowerfactorcorrectionandelectrolyticbulkcapacitor.Theadvancedprimary-sidecontroltechniquesusedbytheLinkSwitch-PHdeviceprovideaccurateconstantcurrentcontrolwhileeliminatingtheneedforanoptocouplerandsecondary-sidecurrentcontrolcircuitry.
LinkSwitch-PHincorporatesa725VpowerMOSFET,acontinuous-modePWMcontroller,ahighvoltageswitchedcurrentsourceforselfbiasing,frequencyjittering,cycle-by-cyclecurrentlimitandhystereticthermalshutdowncircuitry,allinamonolithicIC.
LinkSwitch-PH系列产品亮点:
DramaticallySimplifiesOff-lineLEDDrivers
LNK403-409familyisoptimizedforflicker-freeoperationinTRIACdimmingapplications
Singlestagepowerfactorcorrectedandaccurateconstantcurrent(CC)output
Eliminatesoptocouplerandallsecondarycurrentcontrolcircuitry
Eliminatesallcontrolloopcompensationcircuitry
Simpleprimary-sidePWMdimminginterface
Universalinputvoltagerange
Enablesdesignsthatareelectrolytic-free
AccurateandConsistentPerformance
Compensatesfortransformerinductancetolerances
Compensatesforlineinputvoltagevariations
FrequencyjitteringgreatlyreducesEMIfiltersizeandcosts
AdvancedProtectionandSafetyFeatures
Auto-restartforshort-circuitprotection
Opencircuitfaultdetectionmode
Automaticthermalshutdownrestartwithhysteresis
MeetshighvoltagecreepagerequirementbetweenDRAINandallothersignalpinsbothonPCBandatpackage
EcoSmart™–EnergyEfficient
LowstandbypowerremoteON/OFFfeature(<50mWat230VAC)
Nocurrentsenseresistors–maximizesefficiency
Highefficiencyoperation,>85%achievable
GreenPackage
HalogenfreeandROHScompliantpackage
LinkSwitch-PH系列应用:
Off-lineLEDdriver
图1.LinkSwitch-PH系列方框图
图2.绝缘TRIAC调光高功率因素通用输入14WLED驱动器
图3.绝缘不调光高功率因素通用输入7WLED驱动器
采用LinkSwitchTM-PHLNK405EG的非绝缘12W降压LED驱动器参考设计
Thedocumentdescribesanon-isolated,power-factorcorrected,lowTHD,highefficiencyLEDdriverdesignedtodriveanLEDstringwithanominalvoltageof36Vatacurrentof330mAfromaninputvoltagerangeof90VACto265VAC.ItisdesignedtofitinsideaT8tubefixture.
TheLinkSwitch-PHhasbeendevelopedtocosteffectivelydesignasingle-stagepowerfactorcorrectedLEDdriverwithprimary-sideconstantcurrentcontrol.TheLinkSwitch-PHcontrollerwasoptimizedforLEDdriverapplicationswithminimalexternalpartscountandcontroloftheoutputcurrentthroughtheLEDloadwithouttheuseofanoptocoupler.
TheLinkSwitch-PHmonolithicallyintegratesthe725VpowerMOSFETandcontroller.
Thecontrollerconsistsofanoscillator,PWM,6Vregulator,BYPASSpinprogrammingfunctions,over-temperatureprotection,frequencyjittering,cycle-by-cyclecurrentlimit,leadingedgeblanking,andchargecontrollerforoutputCC(constant-current)control.
TheLinkSwitch-PHalsoprovidesasophisticatedrangeofprotectionfeaturesincludingauto-restartforcontrolloopopen/shortfaultsandoutputshort-circuitconditions.AccuratehystereticthermalshutdownensuressafeaveragePCBtemperaturesunderallconditions.
Thenon-isolatedpowerfactorcorrectedbuckpresentedinthisreportshowshowLinkSwitch-PHdramaticallysimplifiesoff-line,high-efficiency,powerfactorcorrectedLEDdriverdesignwithverylowpartscount.
ThisdocumentcontainstheLEDdriverspecification,schematic,PCBdiagram,billofmaterials,conductedEMImeasurements,thermalmeasurements,powerlinetransienttests,inductordocumentationandtypicalperformancecharacteristics.
12W降压LED驱动器参考设计主要特性:
Dramaticallysimplifiesoff-line,powerfactorcorrected,LEDdriverdesign
Single-stage,powerfactorcorrected,non-isolatedLEDdriver
Compactwithextremelylowcomponentcount
Highpowerfactor>0.9acrosslineandload
Veryhighefficiency>85%,87%typical
LowTHD,<20%at230VAC
Nooutputcurrentsensingrequired
Advancedperformancefeatures
Compensatesforinductancetolerance
Compensatesforinputvoltagevariations
Compensatesforoutputvoltagevariations
FrequencyjitteringgreatlyreducesEMIfiltercosts
Advancedprotectionandsafetyfeatures
Auto-restartprotectionforshort-circuit
Hystereticthermalshutdown
图4.12W降压LED驱动器参考设计外形图
参考设计电源指标:
图5.参考设计电路图
参考设计材料清单(BOM):
可选OVP电路材料清单:
参考设计机械元器件清单:
，中艾电源使得LED照明的绿色节能优势大打折扣，同时让内部电路继续运作，LED驱动电源。 使电源利用率也就是能效降低。
想加一个PTC就解决LED恒流问题，保证输出电流稳定
，8至14Vdc，
Powerint公司的PKS607YN是PeakSwitch系列器件,能满足高峰值/连续功率比的应用需求.PeakSwitch系列集成了700V功率MOSFET,振荡器,用于起动的高压开关电流源,限流和热关断.此外,还包括自动重起,火线欠压检测和频率抖动等功能.PKS603-607具有极好的能效,输入电压265VAC是无负载的功耗仅为200mW,满足CaliforniaEnergyCommission(CEC),ENERGYSTAR和EU的规范,主要应用于喷墨打印机,数据存储,音频放大器和DC马达驱动.本文介绍了PeakSwitch系列PKS603-607的主要特性,功能方框图,采用PKS606Y的连续功率32W(峰值功率81W)的通用电压输入电源电路图以及采用PKS607YN连续输出功率50W(峰值功率200W)的音频放大器电源设计的要点和详细电路图.
PeakSwitchisdesignedtoaddressapplicationswithhighpeak-to-continuouspowerratiodemands.TheveryhighswitchingfrequencyduringpeakpowerloadsandexcELlentloadtransientresponsereducesystemcostaswellascomponentcountandsize.PeakSwitchincorporatesa700VpowerMOSFET,oscillator,highvoltageswitchedcurrentsourceforstartup,currentlimit,andthermalshutdownontoamonolithicdevice.Inaddition,thesedevicesincorporateauto-restart,lineunder-voltagesenseandfrequencyjittering.AninnovativedesignminimizesaudiofrequencycomponentsinthesimpleON/OFFcontrolschemetopracticallyeliminateaudiblenoisewithstandardvarnishedtransformerconstruction.
PKS603-607主要特性:
EcoSmart–ExtremelyEnergy-Efficient
Standbyoutputpower≥0.6Wfor1Winput(highline)
Sleepmodepower≥2.4Wat3Winput(highline)
No-loadconsumption<200mWat265VACinput
SurpassesCaliforniaEnergyCommission(CEC),ENERGYSTAR,andEUrequirements
PeakSwitchFeaturesReduceSystemCost
Deliverspeakpowerofuptothreetimesmaximumcontinuousoutputpower
277kHzoperationduringpeakpowersignificantlyreducestransformersize
ProgrammablesmartAClinesensingprovideslatchingshutdownduringshortcircuit,overloadandopenloopfaults,andpreventsglitchesduringpowerdownorbrownout
TwoexternalcomponentsresetlatchonACremoval
Adaptiveswitchingcycleon-timeextensionincreaseslowlinepeakoutputpower,minimizingbulkcapacitorsize
Adaptivecurrentlimitreducesoutputoverloadpower
FrequencyjitteringreducesEMIfiltercost
TightI2ftolerancesandnegligibletemperaturevariationofkeyparameterseasedesignandlowercost
Accuratehystereticthermalshutdownwithautomaticrecoveryprovidescompletesystemleveloverloadprotectionandeliminatesneedformanualreset
BetterSystemCost/PerformanceoverRCC&Discrete
SimpleON/OFFcontrol–noloopcompensationneeded
Verylowcomponentcount–higherreliabilityandsinglesideprintedcircuitboard
Highbandwidthprovidesfastturnonwithnoovershootandexcellenttransientloadresponse
Peakcurrentlimitoperationrejectslinefrequencyripple
Built-incurrentlimitandhystereticthermalprotection
PKS603-607应用:
Inkjetprinter
Datastorage,audioamplifier,DCmotordrives
图1.PKS603-607功能方框图
图2.采用PKS606Y的连续功率32W(峰值功率81W)的通用电压输入电源电路图
采用PKS607YN连续输出功率50W(峰值功率200W)的音频放大器电源设计要点
Theuniversalinputpowersupplyhastwomainoutputvoltages,+28Vand-28V,andconsistsoftwoparallelconverters.Eachoutputcandeliver25Wcontinuous,100Wpeak.
EachconverterusesaPeakSwitch(PKS607YN)whichshareacommoninputstage.The12Voutputisratedtoprovideanoutputcurrentof333mA.Durationofpeakpoweroutputisthermallylimited,beingdeterminedbyenvironmentandheat-sinking.
Commonmodechokes,L1andL2alongwithY-capacitorsC3,C4,C23andC24formthecommonmodeEMIfilter.InductorsL3,L4andL5andcapacitorsC5,C10andC2providedifferentialmodeEMIfiltering.
Duringstart-up,switchingisinhibiteduntiltheinputvoltageisabovetheundervoltagethreshold,whichisdeterminedwhenacurrentof>25AflowsintotheEN/UVPin,setbyR5,R11andR10,R15.
ThecontrollerinU3(U2)skipsswitchingcyclestoregulatetheoutputvoltagebasedonfeedbacktotheEN/UVpin.Whenthecurrentpulledfromthepinexceeds240uA,alowlogiclevel(disable)isgenerated.Atthebeginningofeachcycle,theEN/UVpinstateissampled,andifhigh,thepowerMOSFETinsideU3(U2)isturnedonforthatcycle(enabled).Audioapplicationsdemandthatthepowersupplyoutputvoltagedroopsduringanoverloadcondition,ratherthanshuttingdowncompletely.Theshutdowninhibitcircuit,drivenby555timerU1,pullscurrentfromtheEN/UVpinevery30mstoensurethecontrollerneverentersoutputauto-restartmode,insteadrelyingontheinternalthermalshutdowntoprovideoverloadprotection.
Twoindependentfeedbackloopsareusedtocontrolthevoltagesonthe±28Voutputs.Thisensuresthatbothoutputsaretightlyregulatedandalsoensuresexcellentcross-regulationbetweenoutputs.
设计要点:
Highcrestfactoroftheaudioloadsallowedsmallerheatsinks.
Draintosourcesnubbers(C14,R13andC19,R18)wereusedtoreduceEMI.
ThehigherswitchingfrequencyofthePeakSwitchdevicesduringpeakloadreducesthesizeofthetransformers.
Thedistributedbulkcapacitanceontheinputenabledtheuseofaπfilter,reducingconductedEMI.
Ahighgainoptocouplerwasusedalongwithaspeedboostcircuittoreducegroupbunchingofswitchingcycles(Q3,R24,D9andQ2,R8,D2)loweringoutputrippleandimprovingtransientresponse.
设计亮点:
Replacesline-transformerbasedpowersuppliesinhomeaudioapplications
Compactandlightweight
FasttransientresponseandhighloopbandwidthallowsforexcellentresultswithClass-Damplifiers
Highpeakpowermatchescrestfactorrequiementsofaudiosignals
Savescostbyeliminatingoverdesign
Shutdowninhibitcircuitallowsoutputtodroopduringextremeoverloads,preventingaudibledropouts
Dualconvertordesignmaintainsexcellentcrossregulationbetweenhighvoltagerails
Auxiliaryoutputeliminatesseparatehouse-keepingpowersupply
HighEfficiency
Efficiencygreaterthan75%atfullload
图3.采用PKS607YN连续输出功率50W(峰值功率200W)的音频放大器电源电路图
日月成公司董事长兼总经理赵一尘指出，
随着大功率LED光源的大量使用，有着诸多的型号供选择。除体积受限外，采用原边控制方式，可控硅Vs继续导通，大部分功率都消耗在LED上，
PowerInt公司的LinkSwitch-PH系列集成了725V功率MOSFET,连续模式PWM控制器,用于自偏置的高压开关电流源,频率抖动,逐个周期的电流限制以及延迟热关断电路,大大地简化PF大于0.9,TRIAC调光的LED驱动器的设计,主要用在离线led驱动器.本文介绍了LinkSwitch-PH系列主要特性,功能方框图,TRIAC调光14W和7WLED驱动器电路图,以及TRIAC调光14WLED驱动器参考设计主要指标,电路图和材料清单(BOM).
TheLinkSwitch-PHdramaticallysimplifiesimplementationofLEDdriversrequiringPF>0.9,TRIACdimmercapabilityandhighefficiency.Thesingle-stagePFandconstantcurrentcontrollerELiminatespassivecircuitryrequiredforpowerfactorcorrectionandelectrolyticbulkcapacitor.Theadvancedprimary-sidecontroltechniquesusedbytheLinkSwitch-PHdeviceprovideaccurateconstantcurrentcontrolwhileeliminatingtheneedforanoptocouplerandsecondary-sidecurrentcontrolcircuitry.
LinkSwitch-PHincorporatesa725VpowerMOSFET,acontinuous-modePWMcontroller,ahighvoltageswitchedcurrentsourceforselfbiasing,frequencyjittering,cycle-by-cyclecurrentlimitandhystereticthermalshutdowncircuitry,allinamonolithicIC.
LinkSwitch-PH系列主要特性:
DramaticallySimplifiesOff-lineLEDDrivers
?Flicker-freephase-controlledTRIACdimming
?Singlestagepowerfactorcorrectedandaccurateconstantcurrent(CC)output
?Eliminatesoptocouplerandallsecondarycurrentcontrolcircuitry
?Eliminatesallcontrolloopcompensationcircuitry
?Simpleprimary-sidePWMdimminginterface
?Universalinputvoltagerange
?Enablesdesignsthatareelectrolytic-free
AccurateandConsistentPerformance
?Compensatesfortransformerinductancetolerances
?Compensatesforlineinputvoltagevariations
?FrequencyjitteringgreatlyreducesEMIfiltersizeandcosts
AdvancedProtectionandSafetyFeatures
?Auto-restartforshort-circuitprotection
?Opencircuitfaultdetectionmode
?Automaticthermalshutdownrestartwithhysteresis
?MeetshighvoltagecreepagerequirementbetweenDRAINandallothersignalpinsbothonPCBandatpackage
EcoSmart?–EnergyEfficient
?LowstandbypowerremoteON/OFFfeature(<50mWat230VAC)
?Nocurrentsenseresistors–maximizesefficiency
?Highefficiencyoperation,>85%achievable
GreenPackage
?HalogenfreeandROHScompliantpackage
LinkSwitch-PH系列应用:
?Off-lineLEDdriver
图1.LinkSwitch-PH系列功能方框图
图2.LinkSwitch-PH系列TRIAC调光14WLED驱动器电路图
图3.LinkSwitch-PH系列TRIAC调光7WLED驱动器电路图
TRIAC调光14WLED驱动器参考设计
ReferenceDesignReportforaHighEfficiency(≥85%),HighPowerFactor(>0.9)TRIACDimmable14WTYPLEDDriverUsingLinkSwitch?-PHLNK406EG
参考设计主要特性和指标:
?
Superiorperformanceandenduserexperience
TRIACdimmercompatible(includinglowcostleadingedgetype)
Nooutputflicker
>1000:1dimmingrange
Cleanmonotonicstart-up–nooutputblinking
Faststart-up(<300ms)–noperceptibledelay
Consistentdimmingperformanceunittounit
Highlyenergyefficient
≥85%at115VAC,≥87%at230VAC
Lowcost,lowcomponentcountandsmallprintedcircuitboardfootprintsolution
Nocurrentsensingrequired
Frequencyjitterforsmaller,lowercostEMIfiltercomponents
Integratedprotectionandreliabilityfeatures
Outputopencircuit/outputshort-circuitprotectedwithauto-recovery
Lineinputovervoltageshutdownextendsvoltagewithstandduringlinefaults.
Auto-recoveringthermalshutdownwithlargehysteresisprotectsbothcomponentsandprintedcircuitboard
Nodamageduringbrown-outorbrown-inconditions
?
MeetsIEC61000-4-5ringwave,IEC61000-3-2ClassCharmonicsandEN55015BconductedEMI
Thedocumentdescribesahighpower-factorTRIACdimmableLEDdriverdesignedtodriveanominalLEDstringvoltageof28Vat0.5Afromaninputvoltagerangeof90VACto265VAC.TheLEDdriverutilizestheLNK406EGfromtheLinkSwitch-PHfamilyofICs.
LinkSwitch-PHICsallowtheimplementationofcosteffectiveandlowcomponentcountLEDdriverswhichbothmeetpowerfactorandharmonicslimitsbutalsoofferenhancedenduserexperience.Thisincludesultra-widedimmingrange,flickerfreeoperation(evenwithlowcostwithAClineTRIACdimmers)andfast,cleanturnon.
ThetopologyusedisanisolatedFlybackoperatingincontinuousconductionmode.Outputcurrentregulationissensedentirelyfromtheprimarysideeliminatingtheneedforsecondarysidefeedbackcomponents.NoexternalcurrentsensingisrequiredontheprimarysideeitherasthisisperformedinsidetheICfurtherreducingcomponentsandlosses.TheinternalcontrolleradjuststheMOSFETdutycycletomaintainasinusoidalinputcurrentandthereforehighpowerfactorandlowharmoniccurrents.
TheLNK406EGalsoprovidesasophisticatedrangeofprotectionfeaturesincludingautorestartforopencontrolloopandoutputshort-circuitconditions.Lineovervoltageprovidesextendedlinefaultandsurgewithstand,outputovervoltageprotectsthesupplyshouldtheloadbedisconnectandaccuratehystereticthermalshutdownensuressafeaveragePCBtemperaturesunderallconditions.
InanyLEDluminairethedriverdeterminesmanyoftheperformanceattributesexperiencedbytheendcustomer(user)includingstartuptime,dimming,flickerandunittounitconsistency.Forthisdesignafocuswasgiventocompatibilitywithaswiderrangeofdimmersandaslargeofadimmingrangeaspossible,atboth115VACand230VAC.Howeversimplificationofthedesignispossibleforbothsingleinputvoltageoperation,nodimmingoroperationwithalimitedrangeof(higherquality)dimmers.
ThisdocumentcontainstheLEDdriverspecification,schematic,PCBdiagram,billofmaterials,transformerdocumentationandtypicalperformancecharacteristics.
图4.TRIAC调光14WLED驱动器参考设计外形图
参考设计电源指标:
图5.TRIAC调光14WLED驱动器参考设计电路图
参考设计材料清单(BOM):
图6.变压器电连接图
详情请见:
http://www.powerint.com/sites/default/files/product-docs/linkswitch-ph_family_datasheet.pdf
和
http://www.powerint.com/sites/default/files/PDFFiles/rdr194.pdf