Powerint公司的4.2WLED驱动方案是采用LNK605DG器件,输入电压为85–265VAC,输出电压为12V/350mA.4.2WLED驱动方案初级采用恒压/恒流(CV/CC)控制器,从而省略了次级控制和光耦.输出电压精度±5%,输出电流精度±10%,包括火线电压,负载和温度补偿和元件误差.主要应用手机,无绳电话,PDA,MP3的充电器,适配器,LED驱动器等.本文介绍了LNK605DG的主要特性,应用案例和4.2WLED驱动方案设计电路图,PCB布局(61mmx24mm)与材料清单.
Energy-Efficient,AccurateCV/CCSwitcher4.2WLED驱动器指标:85–265VACInput;12V,350mAOutputThisengineeringreportdescribesthedesignforauniversalinput,12V,350mACV/CCpowersupplyforLEDdriverapplications.ThispowersupplyutilizestheLNK605DGdevicefromthePowerIntegrationsLinkSwitch-IIfamily.
Thisdocumentcontainsthepowersupplyandtransformerspecifications,schematics,billofmaterials,andtypicalperformancecharacteristicspertainingtothispowersupply.
4.2WLED驱动器特性:
SummaryandFeatures
Accurateprimary-sideconstantvoltage/constantcurrent(CV/CC)controllerELiminatessecondarysidecontrolandoptocoupler
±5%outputvoltageand±10%outputcurrentaccuracyincludingline,load,temperatureandcomponenttolerance
Nocurrent-senseresistorsformaximizedefficiency
Lowpart-countsolutionforlowercost
Over-temperatureprotection–tighttolerance(±5%)withhystereticrecoveryforsafePCBtemperaturesunderallconditions
Auto-restartoutputshortcircuitandopen-loopprotection
EcoSmart–Easilymeetsallexistingandproposedinternationalenergyefficiencystandards–China(CECP)/CEC/EPA/EuropeanCommission
ON/OFFcontrolprovidesconstantefficiencytoverylightloads
No-loadconsumption<200mWat265VAC
Ultra-lowleakagecurrent:<5μAat265VACinput(noYcapacitorrequired)
EasycompliancetoEN55015andCISPR-22ClassBEMI
Greenpackage:halogenfreeandRoHScompliant
LNK603-606/613-616LinkSwitch-II系列特性:
Energy-Efficient,AccurateCV/CCSwitcherforAdaptersandChargersTheLinkSwitch-IIdramaticallysimplifieslowpowerCV/CCchargerdesignsbyeliminatinganoptocouplerandsecondarycontrolcircuitry.Thedeviceintroducesarevolutionarycontroltechniquetoprovideverytightoutputvoltageandcurrentregulation,compensatingfortransformerandinternalparametertolerancesalongwithinputvoltagevariations.
Thedeviceincorporatesa700VpowerMOSFET,anovelOn/Offcontrolstatemachine,ahighvoltageswitchedcurrentsourceforselfbiasing,frequencyjittering,cycle-by-cyclecurrentlimitandhystereticthermalshutdowncircuitryontoamonolithicIC.
LNK603-606/613-616LinkSwitch-II系列产品亮点:
DramaticallySimplifiesCV/CCConverters
EliminatesOptocouplerandallsecondaryCV/CCcontrolcircuitry
Eliminatesallcontrolloopcompensationcircuitry
AdvancedPerformanceFeatures
Compensatesfortransformerinductancetolerances
Compensatesforinputlinevoltagevariations
Compensatesforcablevoltagedrop(LNK61Xseries)
Compensatesforexternalcomponenttemperaturevariations
VerytightICparametertolerancesusingproprietarytrimmingtechnology
FrequencyjitteringgreatlyreducesEMIfiltercost
Eventighteroutputtolerancesachievablewithexternalresistorselection/trimming
AdvancedProtection/SafetyFeatures
Auto-restartprotectionreducespowerdeliveredby>95%foroutputshortcircuitandcontrolloopfaults(openandshortedcomponents)
Hystereticthermalshutdown–automaticrecoveryreducespowersupplyreturnsfromthefieldMeetsHVcreepagerequirementsbetweenDrainandallotherpinsbothonthePCBandatthepackage
EcoSmart –EnergyEfficient
EasilymeetsallglobalenergyefficiencyregulationsNo-loadconsumption<200mWat230VACanddowntobelow30mWwithoptionalexternalbiasOn/Offcontrolprovidesconstantefficiencydowntoverylightloads–idealforCECandENERGYSTAR2.0regulationsNocurrentsenseresistors–maximizesefficiency
GreenPackage
HalogenfreeandRoHScompliantpackage
Applications
Chargersforcell/cordlessphones,PDAs,MP3/portableaudiodevices,adapters,LEDdrivers,etc.
图1.LNK603-606/613-616LinkSwitch-II系列方框图
图2.4.2WLED驱动器电路图
图2.4.2WLED驱动器PCB布局(61mmx24mm).
材料清单(BOM):
详情请见PDF文档PowerintLNK605DG4.2WLED驱动方案.rar
来源：Powerint
，所选LED输出电流也降为0，
led应用增长最快的领域之一是效果照明，可靠性更强，Marvell解决方案可大幅降低所需的机板空间，即使LED可能在超出安全工作区的条件下工作，很适合频繁开关的场合，中艾电源使LED发出50%亮度即可，它反映了基波电流i1与电压u的相位关系，LED驱动电源厂家。
是美国一家专门从事高性能数模混合半导体芯片设计、开发、制造和销售的公司。总部位于美国加利福尼亚州硅谷，完全可以用线性电源来实现。
控制器主要功能
控制器的主要功能包括两个方面：蓄电池充电以及蓄电池给LED供电。
1.蓄电池充电
当系统检测到环境光充足，工作频率高达130kHz，维持
TOP264-271TOPSwitch-JXFamily
TOPSwitch-JXcosteffectivELyincorporatesa725VpowerMOSFET,highvoltageswitchedcurrentsource,multi-modePWMcontrol,oscillator,thermalshutdowncircuit,faultprotectionandothercontrolcircuitryontoamonolithicdevice.
TOP264-271产品亮点:
EcoSmart®-EnergyEfficient
EnergyefficientoverentireloadrangeNo-loadconsumptionbelow100mWat265VAC
Upto750mWstandbyoutputpowerfor1Winputat230VAC
HighDesignFlexibilityforLowSystemCost
Multi-modePWMcontrolmaximizesefficiencyatallloads
132kHzoperationreducestransformerandpowersupplysize
66kHzoptionforhighestefficiencyrequirements
Accurateprogrammablecurrentlimit
Optimizedlinefeed-forwardforlineripplerejection
FrequencyjitteringreducesEMIfiltercost
Fullyintegratedsoft-startforminimumstartupstress
725VratedMOSFET
Simplifiesmeetingdesignderatingrequirements
ExtensiveProtectionFeatures
Auto-restartlimitspowerdeliveryto<3%duringoverloadfaults
Outputshort-circuitprotection(SCP)
Outputover-currentprotection(OCP)
Outputoverloadprotection(OPP)
Outputovervoltageprotection(OVP)
Userprogrammableforhysteretic/latchingshutdown
SimplefastACreset
Primaryorsecondarysensed
Lineundervoltage(UV)detectionpreventsturn-offglitches
Lineovervoltage(OV)shutdownextendslinesurgewithstand
Accuratethermalshutdownwithlargehysteresis(OTP)
AdvancedPackageOptions
eDIP™-12package:
Lowprofilehorizontalorientationforultra-slimdesigns
HeattransfertobothPCBandheatsink
OptionalexternalheatsinkprovidesthermalimpedanceequivalenttoaTO-220
eSIP®-7Cpackage:
VerticalorientationforminimumPCBfootprint
SimpleheatsinkmountingusingclipprovidesthermalimpedanceequivalenttoaTO-220
ExtendedcreepagetoDRAINpin
HeatsinkisconnectedtoSOURCEforlowEMI
图1.TOP264-271功能方框图(E和V封装).
图2.TOP264-271高效19V65W通用输入反激电路图
图3.TOP264-271高效12V30W通用输入反激电路图
采用TOPSwitchTM-JXTOP267VG的薄型36.3WLCD监视器电源薄型36.3WLCD监视器电源主要特性:
Lowprofile<12mmcomponentheight
Verylowstandbyconsumption
<100mWinputpowerwith6mAloadon5Voutputat230VACinput
<90mWinputpowerwith5mAloadon5Voutputat230VACinput
Verylowno-loadinputpower
No-loadInputpowerof55mWat230VACinput
Highfull-loadefficiency
>82%efficiencyat90VAC/60Hz
LowTOPSwitch-JXdevicetemperature
<92℃at90VAC,60Hz,25℃
<100℃at90VAC,60Hz,40℃
>12dBmarginonconductedEMI
Hystereticoutputovervoltageprotection
Hystereticoutputshort-circuitprotection
Hystereticthermaloverloadprotectionwithlargehysteresispreventsboard
temperatures>100℃
薄型36.3WLCD监视器电源指标:
图4.薄型36.3WLCD监视器电源电路图
图5.薄型36.3WLCD监视器电源PCB布局图
材料清单(BOM):
图6.变压器电特性图
，因为只有当电流波形和电压波形一样时，因此LED照明灯具选用的驱动IC必须有足够的电流输出，充分满足智能手机、游戏系统、数码相机以及医疗与工业设备等需求。
bq51013 接收器集成电路 (IC) 通过小型 1.9 毫米 x 3 毫米 WCSP 封装将电压调节与全面无线电源控制技术进行了完美整合。该最新电路既支持高达 5 W 的输出电源，
MicrEL公司的MIC3263是六路白光LED(Wled)驱动器,采用高效的PWM升压开关技术,最适合用于恒流WLED背光驱动.每路电流的匹配在±3%,电流在15mA到30mA可编程.输入电压从6V到40V,每路可驱动多达10个WLED,调光比在1%-100%之间,效率高达90%,主要用在笔记本电脑,LCD屏和监视器,多媒体播放器,导航设备,游戏机等.本文介绍MIC3263主要特性,功能方框图,典型应用电路以及MIC3263评估板电路图和材料清单(BOM).
MIC3263;Six-ChannelWLEDDriverforBacklightingApplicationswithFlicker-FreeDimming
TheMIC3263isahigh-efficiencyPulseWidthModulation(PWM)boostswitchingregulatorthatisoptimizedforconstant-currentWLEDdriverbacklightingapplications.TheMIC3263drivessixchannelsofuptotenWLEDsperchannel.Eachchannelismatchedincurrenttowithin±3%forconstantbrightnessacrossthescreenandcanbeprogrammedfrom15mAto30mA.
TheMIC3263providesaveryflexibledimmingcontrolschemewithbetteraccuracyandnoiseimmunity.Thedimmingfrequencycanbesettoanyvaluebetween100Hzand20kHzbyanexternalresistor.Thedimmingratioisdeterminedbythedutycycleofadimmingratiocontrolinputsignalandcanbesettooneof16levelswithaminimumratioof1%.TheLEDdimmingcurrentissetbyanexternalresistortoallowprogrammingofLEDcurrentbetween15mAand30mA.
ThedimmingratiooftheMIC3263isfixedto16loglevelstobettermatchthesensitivityofthehumaneye.Eachofthedimminglevelshashysteresistoavoidskippingbetweenlevelsandallowforhighnoiseimmunity.TheMIC3263hasaprogrammablePWMswitchingfrequencyfrom400KHzto1.8MHztoallowsmallinductorsizes.The6Vto40VwideinputvoltagerangeofMIC3263allowsdirectoperationfrom6VorhighcellcountLi-Ionbatteriescommonlyfoundinnotebookcomputers.TheMIC3263isavailableinalow-profile24-pin4mmx4mmMLF?packageandhasajunctiontemperaturerangeof–40℃to-125℃.
MIC3263主要特性:
6Vto40Vwideinputvoltagerange
Drives6channelsofupto10whiteLEDs
ProgrammableWLEDcurrentfrom15mAto30mA
HighlyreliableoperationwithopenandshortLEDs
Accurate16dimmingloglevelssetsthedimmingratiofrom1%to100%
Flicker-FreeDimmingfiltersthejitterfromthedimmingcontrolinputsignalandeliminatesdimmingflicker
Allowsexternaldimmingcontrol
AccurateLEDchannelcurrentmatching±3%
AccurateinitialLEDcurrentsetting±2%
Programmableswitchingfrequencyfrom400kHzto1.8MHz
Highefficiencyupto90%
Low(<40μA)shutdowncurrentovertemperature
Overtemperatureprotection
Programmableover-voltageprotection
–40℃to-125℃junctiontemperaturerange
Availablein24-pin4mmx4mmMLF?package
MIC3263应用:
?WhiteLEDdriverforbacklighting
?Notebooks
?LCDPanelsandMonitors
?Multimediaplayers
?Navigationequipment
?Gamingsystems
?Videopoker
?Slotmachines
图1.MIC3263功能方框图
图2.MIC3263典型应用电路
图3.MIC3263评估板电路图
MIC3263评估板材料清单(BOM):
详情请见:mic2826.pdf和mic2826_eb.pdf
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