TI UCC28810 110W离线LED照明解决方案
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
•OutdoorLighting:Street,Roadway,Parking,ConstructionandOrnamentalLEDLightingFixtures
•LCDTVLEDBacklighting
图3.UCC28810EVM-003外形图
图4.UCC28810EVM-003单板装配图
UCC28810EVM-003电性能指标:
图5.UCC28810EVM-003PFC级电路图
图6.UCC28810EVM-003降压级电路图
图7.UCC28810EVM-003DC变压器电路图
UCC28810EVM-003材料清单:
图8.UCC28810EVM-003PCB布局图(上:顶层元件布局,中:顶层铜布线,下:底层铜布线)
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