LED驱动电源厂家适用于单级PFCLED驱动器来节约成本

其中，Prema公司的PR4101是大功率LED降压驱动器,能串通方式驱动一个或多个大功率led.工作电压可高达40V,采用外接N沟MOSFET开关管,输出电流可高达1A.可用于卤素灯,通用照明,告警照明,汽车照明,信号指示和LCD背景光.本文介绍了PR4101的主要特性,方框图,典型应用电路,以及采用12/24V电源,12VDC和12VAC电源的PR4101各种应用电路.

HighPowerLEDBuckDriverPR4101
ThePR4101isaLEDbuckdriverfordrivingoneorseveralhighpowerLEDsinseries.
Thesupplyvoltagecanbeupto40V,withanoutputcurrentofmorethan1Ausingan
externalN-channELMOSFETswitchingtransistor.ThePR4101AwithadditionalPWMand
powerdowninputisdeliveredSOP14packaged,whilethePR4101BisofferedSO8
packaged.



PR4101主要特性:
Adjustableoutputcurrentof1Aandmore
Supplyvoltageupto40VbulbreplacementbyLEDs
Dimmingwithphase-cutdimmer
BrightnesscontrolwithPWM(PR4101Aonly)
Outputcurrenttemperaturecompensation
Delayedstartpossible(PR4101Aonly)
Overtemperatureprotection
FrequencyspreadingforimprovedEMI
Lowstandbycurrentof<35μA
Undervoltagelockout

应用:
Halogenlamporfilament
Generalillumination
Warninglights
Automotivelighting
Indicatorsigns
LCDbacklighting



图1.PR4101典型应用电路



图2.PR4101方框图



图3.采用PR4101的12/24V电源的PR4101应用电路



图4.采用12VDC的PR4101应用电路图



图5.采用12VAC的PR4101应用电路



图6.PR4101显示板电路图

详情请见:
http://www.prema.com/pdf/pr4101.pdf，中艾电源或15%的发光效率。低效率、产生热量和卤素囊处理问题是这种技术的缺点。另外，在最终用户使用过许多某款寿命在10,000小时左右的灯泡之前，LED电源批发。 能够调整反向降压转换器的输出电流。该解决方案无需差分放大器或误差放大器，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
，耗电仅为普通白炽灯的1/10，可靠性问题更成为生产厂商和客户关注的焦点。主级侧恒流技术的成熟，中艾电源LED电源批发    ZMDI公司的Zled7022是六路低噪音恒定频率电荷泵DC/DC转换器,可驱动六路LED,每路LED的电流从1.8mA到20mA可编程,并联工作时可驱动更大电流的LED,工作电压2.8V-5.5V,关断模式电流小于2uA,主要用在手提设备的LED背光,手机,智能手机和PDA的LED照明,数码相框照明等.本文介绍了ZLED7022主要特性和`优势,方框图以及典型应用电路.

TheZLED7022,oneofourZLEDfamilyofLEDcontrolICs,isalow-noise,constant-frequencychargepumpDC/DCconverterthatcandriveuptosixLEDchannELs,providingaprogrammableconstantcurrentlevelrangingfrom1.8mAto20mAperLEDchannel.ItcanalsodrivehighercurrentLEDsbecauseitscurrentsinkscanoperateinparallel.ItenableswhiteorothercolorLEDapplicationsthatrequireuniformintensityand/orlinearprogressionsinbrightness.CapableofoperatingefficientlywithDCvoltagesuppliesrangingfrom2.8Vto5.5V,itisidealforsmall,battery-poweredapplicationsbecauseveryfewexternalcomponentsareneeded:typicallyonesmall-dimension1μFcapacitoracrosstheC+andC-pinsandtwosmall-dimension2.2μFcapaci-torstoGNDfromtheVCCandVoutpins.

TheZLED7022’sPulseCountControl(PCC)serialdigi-talinputisusedtoenable/disabletheLEDsandsetthecurrentlevel(14settingsusinganearlylogarithmicscaletoprovidealinearbrightnessprogression).Thissimple,high-speedinterfaceallowsefficientreal-timemanagementofLEDsviamicrocontrollersorcontrolsystems.

TheZLED7022’sfeaturesincludeintegratedsoft-startcircuitrytoprotectagainstexcessivein-rushcurrentduringpower-onandalow-currentshutdownmodethatreducesquiescentcurrentconsumptiontoapproximately1μA(typical)bydisconnectingtheloadfromtheinputwhentheEN/SETpinislowforaspecifiedtime.

ZLED7022主要特性:

Lowquiescentcurrentinlow-currentshutdownmode:1μAtypical;<2μAmaximum

IntegratedthermalshutdownprotectionpreventsdamagebyshuttingdowntheZLED7022ifthediejunctiontemperatureexceeds160℃(typical)

Fixedchargepumpswitchingfrequency:1MHz(typ.)

Soft-startfeatureprotectsagainstexcessiveinrushcurrentduringpower-on

ZLED7022优势:

Currentmatchingaccuracy:±0.9%(typical)

One-pinon/offorbrightnesscontrolforuptosixLEDsviaasimplePCCserialinterface—nopulse-widthmodulationoradditionalcontrolcircuitneeded

14programmablecurrentlevelsforachievingreal-timecontrolofeffectssuchasLEDfade-outorsuddenchangesinbrightness

LowEMIandback-injectednoisebecausethechargepumpisnotinductor-based

Veryfewexternalcomponentsneededforoperation

FlexibledesignenablesdiverseLEDapplications:upto20mAperchannel

LEDdriverfamilyconceptwithlow-voltagefour-channelLEDdriverZLED7012

ZLED7022典型应用:

LEDbacklightingforportabledevices

LEDlightingforcellphones,smartphones.PDAs

Illuminationofdigitalphotoframes

BacklightingforGPS/navigationsystems

LowvoltageLEDlightingfixtures

Generalpurposelow-voltageindustrialandconsumerapplications


图1.ZLED7022方框图

图2.ZLED7022应用电路

图3.ZLED7022采用D4:D0的基本应用电路
，LED的使用寿命可达5至10万小时；LED由无毒的材料制成，

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

   ·功率因子:>0.5

   ·平均效率:>75%

   ·输出恒压/恒流:DC10.2V，工作情况正常。随着太阳能板的价格进一步降低和LED性价比的提高，     Cypress公司的CY8CledAC02是高性能离线LED驱动器,AC离线输入从80V到277VAC,输出功率高达25W,调光效率从2%到100%,主要用在可调光的离线LED驱动器,LED替代灯以及LED照明.本文介绍CY8CLEDAC02主要特性,方框图,简化和典型的应用电路图,以及采用CY8CLEDAC02的220VAC17W可调光LED驱动器参考设计系统指标,电路图,材料清单和变压器指标.

TheCY8CLEDAC02isahighperformanceofflineLEDdriver,designedtointerfacedirectlywithmostconventionalphasecutbasedwalldimmers.Thedeviceusesproprietarydigitalcontroltechnologytoprovideautomaticdetectionofdimmertype

(leadingortrailingedge).ItautomaticallygeneratesdimmingsignalsforLEDloadsandhastheabilitytodimdownto2%.ItmodulatesLEDbrightnessusingalineardimmingschemeandswitchestoaPWMbaseddimmingschemeforoutputcurrentlevELslowerthan20%ofthefullloadcurrent.InPWMmodeoptimizeddimmingfrequenciesintherangeof900Hzresultinzerovisibleflicker.

AttheheartofaCY8CLEDAC02basedsystemisthechoppingcircuitwhichprovidestheloadnecessarytoenablecorrectwalldimmeroperation.ItalsoimprovesPFwhenthereisnodimmerontheline.

Thedevices’proprietaryprimarysidesensingenablestightLEDcurrentregulationandeliminatestheneedforsecondaryfeedbackcircuitry.Noopto-couplersarenecessarytomeetULisolationrequirements;enablingflybackconversionwithautomaticisolation.

TheCY8CLEDAC02operatesinquasi-resonantmodetoachievehighefficiency.ThismodeofoperationhelpsminimizeexternalcomponentcountandsimplifiesEMIdesign,loweringthetotalbillofmaterialcost.

Thedevice’scycle-by-cycleadaptivedigitalregulationusescriticaldiscontinuousconductionmode(CDCM)whendrivingLEDloads.Thecontrolalgorithmforcycle-by-cycleregulationhasinternalcompensationforguaranteedsystemphaseandgainmargins;requiringnoexternalcomponentsforloopcompensation.

TheCY8CLEDAC02hasfullfeaturedcircuitprotectionnotnormallyavailablewithotherprimary-sidecontrolsolutions.Thebuilt-inprotectionincludesoutputovervoltageprotection(OOVP),outputshortcircuitprotection(OSCP),overtemperatureprotection(OTP),current-senseresistorshortprotection(CSSP),andpeakcurrentlimitprotection(PCLP).ItalsoenablesautomaticLEDbrightnessadjustmenttocompensatefortemperaturedriftbysimplyconnectingaNTCresistortotheVTpin.

CY8CLEDAC02主要特性:

■ACofflineinputrangefrom80to277VAC

■Upto25Woutputpowerrange

■Intelligentwalldimmerdetection:

?Leadingedge(R,RL)dimmers

?Trailingedge(RC,RLC)dimmers

?Nodimmer

■Widedimmingrangefrom2to100%

■Resonantcontroltoachievehighefficiency(85%withoutdimmer)

■Meetsharmonicrequirementwithhighpowerfactor(0.7withoutdimmer)

■Primary-sidesensingeliminatesopto-isolators

■TightLEDcurrentregulation(typically<+2.5%)

■Lowstartupcurrent(typically10??A)

■Lowstartuptime(typically0.5swithactivestartup)

■Multipleprotectionfeatures:

?Outputovervoltageprotection(OOVP)

?Outputshortcircuitprotection(OSCP)

?Overtemperatureprotection(OTP)

?Current-senseresistorshortprotection(CSSP)

?Peakcurrentlimitprotection(PCLP)

?Single-pointfaultprotection

CY8CLEDAC02应用:

?DimmableofflineLEDdriver

?DimmableLEDreplacementlamps

?DimmableLEDluminaires

图1.CY8CLEDAC02逻辑方框图

图2.CY8CLEDAC02简化应用电路图

 
图3.CY8CLEDAC02典型应用电路图

采用CY8CLEDAC02的17W调光LED驱动器参考设计

HighLine17WDimmableLEDDriverusingCY8CLEDAC02ReferenceDesignGuide

Thisdocumentdescribesa17WdimmableLEDdriverreferencedesignusingtheCY8CLEDAC02AC-DCpowercontrollerdevice.ThisreferencedesigniscapableofdrivingeightwhiteLEDs(typicalloadvoltageof25V)at530mA.

TheCY8CLEDAC02isahighperformanceofflineLEDdriver,designedtointerfacedirectlywithmostconventionalphasecutbasedwalldimmers.Thedeviceusesproprietarydigitalcontroltechnologytoprovideautomaticdetectionofdimmertype(leadingortrailingedge).ItautomaticallygeneratesdimmingsignalsforLEDloadsandhastheabilitytodimdownto2%.

参考设计系统指标:



图4.17W调光LED驱动器参考设计外形图

图5.17W调光LED驱动器参考设计电路图
17W调光LED驱动器参考设计材料清单(BOM):




变压器指标:

ThetransformerisoneofthemostimportantcomponentsinthisLEDdrivercircuit.Asexplainedinprevioussections,inadditiontothetwostandardwindings,typicalflybackconvertertransformersincorporateathirdwinding.Inthiscircuit,itisusedtoprovidevoltagesensingforoutputvoltageregulationandno-loadprotectionbytheCY8CLEDAC02device.Thiswinding,calledthebiasorauxiliarywinding,alsoprovidessupplyvoltage(VCC)totheCY8CLEDAC02.

Thespecificationsofthetransformerforthisreferencedesignareasfollows:

Electricalspecifications

Primaryinductance=1200μHat10kHz

Primaryleakageinductance≤20μHat10kHz

Materials

Core:EF2011(FerritematerialTDKPC40orequivalent)

Bobbin:EF2011

Magnetwires:Type2UEW

Layerinsulationtape:3M1298orequivalent
，舞台或建筑照明以及交通信号。该系列有超宽的输入电压范围：90–305VAC。

       DLA系列中的DLA