TI UCC28810 110W离线LED照明解决方案

时间：2012-05-03 16:28:44

关键字： LED照明照明解决方案 UCC28810

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[导读]TI公司的UCC28810和UCC28811是通用照明电源控制器,能以临界导通模式控制反激,降压或升压转换器,集成了用于反馈误差处理的跨导电压放大器,参考电流发生器,电流检测(PWM)比较器,PWM逻辑和用来驱动外接FET的图腾柱驱动器

TI公司的UCC28810和UCC28811是通用照明电源控制器,能以临界导通模式控制反激,降压或升压转换器,集成了用于反馈误差处理的跨导电压放大器,参考电流发生器,电流检测(PWM)比较器,PWM逻辑和用来驱动外接FET的图腾柱驱动器.主要用在HBLED照明,工业,商业和住宅区照明以及室外照明.本文介绍了UCC28810/1主要特性,方框图,简化应用电路图以及110W离线AC/DCLED驱动器UCC28810EVM-003主要特性,电路图,材料清单和PCB布局图.

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应用:

ACInputGeneralLightingApplicationsUsingHBLEDs

Industrial,CommercialandResidentialLightingFixtures

OutdoorLighting:Street,Roadway,Parking,ConstructionandOrnamentalLEDLightingFixtures

图1.UCC28810/1方框图

图2.UCC28810/1简化应用电路图

110W离线AC/DCLED驱动器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典型应用:

•ACInputGeneralLightingApplicationsUsingHBLEDs

•Industrial,CommercialandResidentialLightingFixtures