TI UCC28810 110W離線LED照明解決方案

時間：2012-05-03 16:28:44

關鍵字： LED照明照明解決方案 UCC28810

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[導讀]TI公司的UCC28810和UCC28811是通用照明電源控制器,能以臨界導通模式控制反激,降壓或升壓轉換器,集成了用于反饋誤差處理的跨導電壓放大器,參考電流發(fā)生器,電流檢測(PWM)比較器,PWM邏輯和用來驅動外接FET的圖騰柱驅動器

TI公司的UCC28810和UCC28811是通用照明電源控制器,能以臨界導通模式控制反激,降壓或升壓轉換器,集成了用于反饋誤差處理的跨導電壓放大器,參考電流發(fā)生器,電流檢測(PWM)比較器,PWM邏輯和用來驅動外接FET的圖騰柱驅動器.主要用在HBLED照明,工業(yè),商業(yè)和住宅區(qū)照明以及室外照明.本文介紹了UCC28810/1主要特性,方框圖,簡化應用電路圖以及110W離線AC/DCLED驅動器UCC28810EVM-003主要特性,電路圖,材料清單和PCB布局圖.

TheUCC28810andUCC28811aregenerallightingpowercontrollersforlowtomediumpowerlumensapplicationsrequiringpowerfactorcorrectionandEMCcompliance.Itisdesignedforcontrollingaflyback,buckorboostconverteroperatingincriticalconductionmode.Itfeaturesatransconductancevoltageamplifierforfeedbackerrorprocessing,asimplecurrentreferencegeneratorforgeneratingacurrentcommandproportionaltotheinputvoltage,acurrent-sense(PWM)comparator,PWMlogicandatotem-poledriverfordrivinganexternalFET.

Inthecriticalconductionmodeoperation,thePWMcircuitissELf-oscillatingwiththeturn-onbeinggovernedbyatransformerzeroenergydetector(TZEpin)andtheturn-offbeinggovernedbythecurrentsensecomparator.

UCC28810/1主要特性:

TransitionModeControllerforLowImplementationCostofACInputLEDLightingApplications

ImplementsSingleStagePowerFactorCorrectedLEDDriver

EnhancedTransientResponseWithSlew-RateComparator

InterfaceswithTraditionalWallDimmers

AccurateInternalVREFforTightOutputRegulation

TwoUVLOOptions

OvervoltageProtection(OVP),Open-FeedbackProtectionandEnableCircuits

±750-mAPeakGateDriveCurrent

LowStart-UpandOperatingCurrents

Lead(Pb)-FreePackages

UCC28810/1應用:

ACInputGeneralLightingApplicationsUsingHBLEDs

Industrial,CommercialandResidentialLightingFixtures

OutdoorLighting:Street,Roadway,Parking,ConstructionandOrnamentalLEDLightingFixtures

圖1.UCC28810/1方框圖

圖2.UCC28810/1簡化應用電路圖

110W離線AC/DCLED驅動器UCC28810EVM-003

TheUCC28810EVM-003isan110-WofflineAC-to-DCLEDcurrentdriverwithpowerfactorcorrection.ThisdesignutilizesathreestageapproachwithauniversalinputboostPFCstage,alow-sidebuckstageprovidingacontrolledcurrentsourceandahalf-bridgeDCtransformerstagetoprovideisolationtofourLEDstrings.

Thisconverterwasdesignedtosupportuptofourstringsof15highbrightnessLED’sinseries(58.5Vmaxperstring).Theconverterwillprovide500-mAaveragecurrenttoeachstring.Thedesignincorporatesaninterfaceformicroprocessorcontroltoallowforshutdownintoalowpowermode(<0.5W)andPWMdimmingoftheLED’s.

Theboost,buckandDChalfbridgemulti-transformerstagesareincludedonaUCC28810EVM-003singleboardassembly.

UCC28810EVM-003主要特性:

90-VRMSto265-VRMSOperation

BoostFollowerorFixedOutputPFCStage

PFCDisable

OutputCurrentDisable

ExternalorInternalPWMDimming

OutputIsolatedfromLineInput

OpenCircuitProtection(IfoneLEDstringfailsopentheremainingstringsstayon.)

UCC28810EVM-003典型應用:

•ACInputGeneralLightingApplicationsUsingHBLEDs

•Industrial,CommercialandResidentialLightingFixtures