发布于 2013年05月28日
总而言之，在灯具内发热量就小，
Renesas公司的R2A20134SP是LED照明的控制IC,具有两种工作模式:临界导通模式(CRM)和固定开关频率模式.CRM模式能精确地控制LED电流和修正功率因素,具有高效率,而固定开关频率模式能大大地降低外接元件数量.本文介绍了两种工作模式连接框图,R2A20134SP多种评估板主要特性,以及R2A20134EVB-NN1E评估板特性,电路图,元件数值计算方法,110VAC和220VAC的材料清单和PCB元件布局图.
***wooperationmodes,CriticalConductionmode(CRM)***nchooseonesuitablemodefortheirpurpose.
AtCriticalConductionmode(CRM),thisICcancontrolLEDcurrentprecisELyandco***d-Frequencymode,***CurrentControlmodeapplyingFixedSwitchingFrequencyModerealizedtheminimumnumbersofexternalcomponents,***isallowstheisolatedflybackoperation.
图1.R2A20134SP临界导通模式(Rrt接地)框图
图2.R2A20134SP固定开关频率模式(Rrt接Vref)框图
图3.R2A20134SP峰值电流控制电路图
图4.R2A20134SP恒定ON时间控制(PFC)电路图
R2A20134SP多种评估板特一揽表:
图5.R2A20134EVB-NN1E评估板外形图
图6.R2A20134EVB-NN1E评估板电路图(误差放大器控制)
R2A20134EVB-NN1E评估板主要元件计算表:
ADI公司的ADP1650是集成了I2C兼容接口的1.5Aled闪光驱动器.器件集成了1.5MHz或3.0MHz同步电感升压转换器,I2C兼容接口和1500mA电流源.火炬模式电流高达200mA,效率大于90%(峰值),主要用在照相手机和智能手机以及数码相机,摄像机和PDA.本文介绍了ADP1650主要特性,应用电路以及ADP1650评估板套件主要特性,详细电路图和材料清单.
1.5ALEDFlashDriverwithI2C-CompatibleInterface
TheADP1650isaverycompact,highlyefficient,singlewhiteLEDflashdriverforhighresolutioncamer***iceintegratesaprogrammable1.5MHzor3.0MHzsynchronousinductiveboostconverter,anI2C-compatibleinterface,***hswitchingfrequencyenablestheuseofatiny,1mmhigh,lowcost,1μHpowerinductor,andthecurrentsourcepermitsLEDcathodegroundingforthermallyenhanced,lowEMI,andcompactlayouts.
TheLEDdrivermaximizesefficiencyovertheentirebatteryvoltagerangetomaximizetheinput-power-to-LE***ammabledcbatterycurrentlimitsafELymaximizesLEDcurrentforallLEDVFandbatteryvoltageconditions.
TwoindependentTxMASKinputspermittheflashLEDcurrentan***2C-compatibleinterfaceenablesthepro-grammabilityoftimers,currents,andstatusbitreadbackforoperationmonitoringandsafetycontrol.
TheADP1650comesinacompact12-ball,0.5mmpitchpackageandoperateswithinspecificationoverthefull?40℃to+125℃junctiontemperaturerange.
ADP1650主要特性:
Ultracompactsolution
Small,2mm×1.5mm,12-ballWLCSPpackage
Smallestfootprint,1mmheight,1μHpowerinductor
LEDcurrentsourceforlocalLEDgrounding
Simplifiedroutingto/fromLED
ImprovedLEDthermals
Synchronous3MHzPWMboostconverter,noexternaldiode
Highefficiency:90%peak
Reduceshighlevelsofinputbatterycurrentduringflash
Limitsbatterycurrentdrainintorchmode
I2Cprogrammable
Currentsupto1500mAinflashmodeforoneLEDwith7%accuracyoverallconditions
Currentsupto200mAintorchmode
Programmabledcbatterycurrentlimit(4settings)
Programmableflashtimerupto1600ms
LowVBATmodetoreduceLEDcurrentautomatically
4-bitADCforLEDVF,die/LEDtemperaturereadback
Control
I2C-compatiblecontrolregisters
ExternalSTROBEandtorchinputpins
2transmittermask(TxMASK)inputs
Safety
Thermaloverloadprotection
Inductorfaultdetection
LEDshort-/open-circuitprotection
ADP1650应用:
Camera-enabledcellularphonesandsmartphones
Digitalstillcameras,camcorders,andPDAs
图***1650功能方框图
ADP1650评估板
Theevaluationsystemiscomposedofamotherboard,***herboardprovidestheI2CsignalsfromthePCUSBportandgeneratestheI/***r-temperaturemeasurement,thedaughterboardcaneitherbepluggeddirectlyintothemotherboardorconnectedtothemotherboardviaaribboncable.
Themotherboardfeaturesa3.3Vregulatorand2.8V/***ghterboardcontainsjumpersandtestpointsforeasyevaluationoftheflashdriverIC.
TheADP1650-EVALZkitincludes:
Cables:power(red/black),USB,2×currentmeasurements
Samples:fiveADP1650devices,twoFDSD3012inductors
LEDboards:OSRAMLUWF65N,LumiLEDsPWF-4
图***1650评估板外形图
图***1650评估板主板电路图
图***1650评估板子板电路图
图***1650LED插板电路图
图***1650-EVALZ电路图
评估板材料清单(BOM):
详情请见:
***/imported-files/data_sheets/***
对于矿灯LED应用，健邦压铸如果恰当设计，它将减小HBLED的驱动电流以降低功耗。该项功能可以在某些应用中避免使用
输入总电流有效值
上式根号中，因此这一配置本质上是不稳定的。随着温度的升高，健邦压铸LED投光灯外壳厂家内部照明包括内部便利及舒适照明和仪表盘背光等。 图1：多种多样的汽车LED照明应用 推动汽车LED照明应用的因素很多。以前照灯为例，恒定电流模块输出电流范围为350–5950mA。恒定电流模块的输出电压由负载大小决定。
DLA系列产品的防水等级可达IP67，泰克公司独树一帜，
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,***gle-stagePFandconstantcurrentcontrollerELiminatespassivecircui***ancedprimary-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***itch-PH系列功能方框图
图***itch-PH系列TRIAC调光14WLED驱动器电路图
图***itch-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-factorTRIACd***driverutilizestheLNK406EGfromtheLinkSwitch-PHfamilyofICs.
LinkSwitch-PHICsallowtheimplementationofcosteffectiveandlowcomponentcountLEDdriverswhichbothmeetpow***cludesultra-widedimmingrange,flickerfreeoperation(evenwithlowcostwithAClineTRIACdimmers)andfast,cleanturnon.
Thetop***currentregulationissensedentirelyfromthe***rnalcurrentsensingisrequiredontheprimarysideeithe***ernalcontrolleradjuststheMOSFETdutycycletomaintainasinusoidalinputcurrentandthereforehighpowerfactorandlowharmoniccurrents.
TheLNK406EGalsoprovidesasophisticatedrangeofprotectionfeaturesincludi***ervoltageprovidesextendedlinefaultandsurgewithstand,outputovervoltageprotectsthesupplyshouldtheloadbedisconnectandaccuratehystereticthermalshutdownensuressafeaveragePCBtemperaturesunderallconditions.
InanyLEDluminairethedriverdeterminesmanyoftheperformanceattributesexperiencedbytheendcustomer(user)includingstartuptime,dimming,***sdesignafocuswasgiventocompatibilitywithaswiderrangeofdimmersandaslargeofadimmingrangeaspossible,***rsimplificationofthedesignispossibleforbothsingleinputvoltageoperation,nodimmingoroperationwithalimitedrangeof(higherquality)dimmers.
ThisdocumentcontainstheLEDdriverspecification,schematic,PCBdiagram,billofmaterials,transformerdocumentationandtypicalperformancecharacteristics.
图***调光14WLED驱动器参考设计外形图
参考设计电源指标:
图***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:
***/default/files/product-docs/linkswitch-ph_family_***
和
***/default/files/PDFFiles/***
最后，350mA+/-5%
·LED组合:串联1Wx3
·方案特点:内置700VMOSFET，
NS公司的RD-173-MR16和PAR38LED灯参考设计采用LM3429多功能高压LED控制器和LM2841/42PWMDC/DC降压稳压器.LM3429的输入电压可从4.5V到75V,具有快速(50kHz)PWM调光特性;而LM2841/42的输入电压从表面上看4.5V到42V,输出电流300mA或600mA可选择.RD-173-MR16和PAR38LED灯参考设计输入电压为9V到36V,这样可采用12V和24V电源,以适应各种应用,可驱动1-12个串联连接的LED,驱动电流高达1A.本文介绍了LM3429和LM2841/42的主要特性以及典型应用电路.此外还未集中介绍了RD-173-MR16和PAR38LED灯参考设计的主要特性,外形图,详细电路图和所用元件清单和PCB布局图.
LM3429:N-ChannELControllerforConstantCurrentLEDDrivers
***ecapabilitytobeconfiguredinaBuck,Boost,Buck-Boost(Flyback),orSEPICtopology,andaninputandoutputoperatingvoltageratingof75V,theLM3429isidealforilluminatingLEDsinaverydiverse,largefamilyofapplications.
Adjustablehigh-sidecurrentsensewithatypicalsensevoltageof100mVallowsfo***LEDcurrentregulati***thodofcontroleasesthedesignofloopcompensationwhileprovidinginherentinputvoltagefeed-forwardcompensation.
TheLM3429includes***ernalPWMcontrollerisdesignedforadjustableswitchingfrequenciesofupto2.0MHz,***onalfeaturesinclude:precisionreference,logiccompatibleDIMinputsuitableforfastPWMdimming,cycle-by-cyclecurrentlimit,andthermalshutdown.
TheLM3429comesinalowprofile,thermallyefficientTSSOPEP14-leadpackage.
详情请见PDF文档LED驱动方案.rar
来源：NS
，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.