LED Converter Introduction (for TV BLU)

LEDConverterIntroductionforTVBLU報告人品質保証處品質服務部王嘉勝2010/06/25Outline•WhyuseLED•LEDtype•DrivingMethodofLED•CharacteristicsComparison•ConverterFunctionBlock–42”ConverterConverterBlockDiagram–Voltageconverter–CurrentSinkIntroduction–ProtectionRequirement–KeyfactorsofcurrentsinkIC•TVLEDBLStructure–EdgeLightStructureIntroduction–DirectLightStructureIntroduction•ManufacturingProcessWhyuseLED?TheImpactofLEDsRGBLEDBLU-OpticalCharacteristicColor：R/G/BLEDMixedBrightness：250nits(19”,22W)Saturation：100%NTSCContrastRatio：800:1ResponseTime：CCFLMeetRoHSRequirement(HgFree)AnRGBLEDbacklightcolorgamutis104%ofNTSCCCFLis75%ofNTSCLEDEasyToUseLED(LightEmittingDiode)：將電能轉換成光能的電子器件﹔正向曲線反向曲線特性曲線RLEDLED發光條件：所加正向電壓LEDVf電壓，即工作在正向導通區域﹔Vf:0.7-3.4VIf:15-120mACCFL&LEDBLUComparisonCCFLLEDAdvantage1.Costeffective1.CompliantwithRoHs2.Shortresponsetime3.Highercolorsaturation4.Highercontrastratio5.Lowerdimmingratio(5%)6.LowerpowerconsumptionDisadvantage1.Withmercury(Hg)2.Higherpowerconsumption1.CosthigherLEDTypeLEDConfigurationDrivingMethodofLEDHowtoSelectDriver?CCFLLEDInverterConverter1.2KVAc（交流高壓）光源:冷陰極射線燈管40Vdc（直流電壓）光源:發光二極管LED串WhatareACandDC?vdcvac0tt0f=1/TDC沒有頻率40Vdc（直流電壓）1.2KVAc（交流高頻高壓）CharacteristicsComparisonCharacteristicsComparisonInverterConverterInputDCDCOutputACDCInputVolatge24V24VOutputVoltage↑1KV(AC)↓60V(DC)OutputCurrent5mA~15mA20mA~200mACurrentBalanceMethodTx.leakageinductance1.1*1Tx.2.1*2Tx.balanceIC1.8ch2.16chType1.Half-bridge2.Full-bridge1.Buck(60V→24V)2.Boost(24V→60V)3.Buck-boost(24V→12Vor60V)TransformerYNPWMICYYPowerMOSFETY(N,PMOSFET)Y(NMOSFET)DimmingFunctionYYConverterFunctionBlock42”ConverterBlockDiagramVIN(24V±10%)Fuse3A/63VI_PWM(0~3.3V)StatusOutCircuitStatusNormal(≦0.8V)Abnormal(3.3V)ON/OFFCircuitBLON(0~0.8V:OFF)(2.0~5.0V:ON)IOP/IUPCircuitE_PWM(160±10Hz,0%~100%)Io:60±3.6mA/StringFuse0.75A/63VE_PWMlevelshiftDC/DC_1CircuitLEDconstantcurrentcontroller_1Outputconnector,ConnecttoLEDstringVLED15constantcurrentchannelCN2LEDconstantcurrentcontroller_2Outputconnector,ConnecttoLEDstringCN3Fuse3A/63VDC/DC_2CircuitLEDconstantcurrentcontroller_3Outputconnector,ConnecttoLEDstringVLED2CN4LEDconstantcurrentcontroller_4Outputconnector,ConnecttoLEDstringCN5Fuse3A/63VDC/DC_3CircuitLEDconstantcurrentcontroller_5Outputconnector,ConnecttoLEDstringVLED3CN6LEDconstantcurrentcontroller_6Outputconnector,ConnecttoLEDstringCN7P_VCC:IC3843VCCB_VCC:IC1828VDDERR1Vref1Vref2Vref3Vref1Vref2Vref3ERR1ERR1ERR1ERR1ERR1ERR1E_PWMDetectorSawwaveformoscillatorPWMcommandfromIPWMIfEPWMisexistDisableI_PWME_PWM1IfIOP/IUPbetriggeredP_VCCwillbedisableVLED1senseIo:60±3.6mA/String5constantcurrentchannelIo:60±3.6mA/String5constantcurrentchannelIo:60±3.6mA/String5constantcurrentchannelIo:60±3.6mA/String5constantcurrentchannelIo:60±3.6mA/String5constantcurrentchannelVLED2senseVLED3senseERR1ERR1ERR1CMP1CMP2CMP3Converter+CurrentSinkCurrentSinkPWMICDCCurrentSinkFBFBFBVLEDVin......BoostCurrentBalanceICVDCurrentSink(1)Boost(24V50V)(2)Buck(120V50)(3)Buck-Boost(24V12V/60V)ProtectionRequirementofConverterIOVP&IUVP(InputOver/UnderVoltageProtection)(24V±10%)OTP(OverTemperatureProtection):CurrentSinkICOVP(VLED)(OverVoltageProtection)OCP(OutputShortProtection)KeyfactorsofcurrentsinkICChannelNo.SustainingVoltage(Max)OutputCurrent(max)EnablePin(Dimmingpin)OperatingTemperature(-40℃~85℃)SupplyVoltageRangeStatusPin(Errorsignaltosystemboard)OTPLEDShort/OpenProtectionTVLEDBLStructureEdgeLightTypeDirectLightType42”EdgeLightBLStructureLGP13LEDsinseries5LEDstringinparallelPanelLightBarLightBarLightBarLightBarLightBarLightBarTotalLEDs=5×13×6=390pcsVLED(Max)=Vf×LEDsinseries=3.4×13=44.2V•LEDSPECI/PPowerEstimation(42”)•InputVoltage:24V+/-10%•Load(LightSource):13W_LEDinseries,30parallel•OutputCurrent:60mAperstring•LEDTotalPowerConsumption:(390pcsLED)•13W_LEDinseries*Vf(typ.)*30parallel*60mAperstring=13*3.2V*30*60mA=75W•OutputVoltage:39.6V(Max.)•Efficiency:85%(Min.)Converter:75W/0.85=88.2W(input)•CCFLConverterroughpoweris120~150W55”DirectLightBLStructure12LEDsinseries16areas(string)16areas(string)16areas(string)16areas(string)16areas(string)16areas(string)16areas(string)16areas(string)55”BLUSpecificationInputVoltage:24V±10%#ofArea:128#ofLEDsperArea:12pcs#ofLEDsperString:12pcs#ofLEDs(totally):1536pcsLEDstringCurrent:NormalMode:35mA(100%Dimming)ScanningMode:40mA(60%Dimming)LEDforwardvoltage:3.0~3.4VMasterBoardSlaveBoard55”LEDBLUwithConverterEffectofLocalDimmingBLHigherContrastRatioManufacturingProcessManufacturingProcessＳＭＴAOI/ICT手焊裂片ＢＩATEPANELDCR/LCR變壓器手擺漏感區間搭配貼LabelVcut4小時35秒ON/5秒OFFDummyloadOpenLamp測試輸出電流/調光工作頻率Burstmode頻率DutyCP點微調ON/OFFFlicker變壓器感值/Q值/斷線包裝FQA入庫貼絕緣片SFIS連結Panel測試製造測試包裝無升壓變壓器ThankYou