User's Guide SLVU326–October2009 TPS61166EVM-446 User's Guide The TPS61166EVM-446 is an evaluation board to assist in evaluating the TPS61166 IC as a WLED driver. Contents 1 Introduction................................................................................................................... 2 2 TPS61166evmElectricalPerformanceSpecifications.................................................................. 3 3 Modifications.................................................................................................................. 4 4 Schematic..................................................................................................................... 4 5 ConnectorandTestPointDescriptions................................................................................... 5 6 TestSetupandResults..................................................................................................... 6 7 EVMAssemblyDrawingsandLayout..................................................................................... 7 ListofFigures 1 TPS61166EVMSchematic ................................................................................................ 4 2 LEDEfficiency ............................................................................................................... 6 3 1kHzPWMDimmingwithD=30%....................................................................................... 6 4 TPS61166EVM-446TopandSilkscreen(ViewedfromTop).......................................................... 7 5 TPS61166EVM-446TopCopper ......................................................................................... 8 6 TPS61166EVM-446BottomLayer........................................................................................ 8 ListofTables 1 TPS61166evmElectricalandPerformanceSpecifications............................................................. 3 2 BillofMaterials............................................................................................................... 9 SLVU326–October2009 TPS61166EVM-446User'sGuide 1 SubmitDocumentationFeedback

Introduction www.ti.com 1 Introduction 1.1 Description TheTPS61166isaboostconverterwitha20-VratedintegratedswitchFETandpowerdiodethatdrives upto5LEDsinseries.ThisdeviceintegratesahighsideswitchFETthatcanturnon/offtheLEDcurrent within1-m softheappliedexternalPWMsignal.Thehighsideswitchalsoprovidesinput-to-outputisolation duringICshutdown. ThedefaultwhiteLEDcurrentissetwiththeexternalsensorresistorR1,andthefeedbackvoltageis regulatedto200-mV,asshowninthetypicalapplicationcircuit.TheLEDcurrentcanbeadjustedusinga pulsewidthmodulation(PWM)signalthroughthePWMpin.TheLEDcurrentissynchronizedtothePWM signal.Thedevicedoesnotdischargetheoutputceramiccapacitorduringdimming,thusreducingaudible noisewhendimming. SeparatingtheICinput(VINpin)andpowerstageinput(VBATpin)makesthedeviceflexibleenoughto supportsingle-ortwo-cellLi-ionbatteryapplications.Otherprotectionfeaturesinclude1.1-Apeak-to-peak overcurrentprotection(OCP),overvoltageprotection(OVP),overloadprotection(OLP),andthermal shutdown.TheTPS61166isavailableina2.5mm· 2.5mmSONpackagewiththermalpad. 1.2 Applications • SmallFormFactorLCDBacklight • MobilePhone • DigitalCamera • PersonalCamcorder • SingleLensReflex 1.3 Features • ICSupplyRange:2.5-Vto6-V • PowerStageInputRange:4.5-Vto10-V • Integrated1.1-A/20-VInternalSwitchFETandPowerDiode • Driveupto5LEDsinSeries • Faston/offLEDCurrentWithin1-m sinBrightnessDimming • BurstPWMDimmingMethodWithFrequencyRangeFrom60-Hzto40-kHz • Built-inSoftStart-up • OverLoadProtection • OverVoltageProtection • 2.5· 2.5· 0.8mmSONPackage 2 TPS61166EVM-446User'sGuide SLVU326–October2009 SubmitDocumentationFeedback

www.ti.com TPS61166evmElectricalPerformanceSpecifications 2 TPS61166evm Electrical Performance Specifications ThespecificationsbelowareforTA=25(cid:176) Cunlessotherwisespecified. Table1.TPS61166evmElectricalandPerformanceSpecifications Parameter Notes&Conditions Min Nom Max Units INPUTCHARACTERISTICS V atJ1 InputVoltage JP4installedtyingV =V 2.5 6 V IN BAT IN V atJ1 InputVoltage JP4removed 4.5 10 V IN V InputUVLO V falling 1.5 1.55 V IN_UVLO IN f PWMdimmingfrequency V <0.3V,1.2V<V <6V 0.06 40 kHz DIM PWML PWMH OUTPUTCHARACTERISTICS I through V =2.5V-10V,EN=PWM=LogicHigh,JP4 29 30 31 OUT LEDcurrent BAT mA JP3 installed V =2.5V-10V,EN=PWM=LogicHigh,JP4 12 17 OUT VoltageatJ4 BAT V installed V =2.5V-10V,EN=PWM=LogicHigh,JP4 18 19 OUT VoltageatJ4 BAT V removed,OVPactive F SwitchingFrequency 1.0 1.2 1.4 MHz SW SLVU326–October2009 TPS61166EVM-446User'sGuide 3 SubmitDocumentationFeedback

Modifications www.ti.com 3 Modifications 3.1 General ToaidusercustomizationoftheEVM,theboardwasdesignedwithdeviceshaving0603orlarger footprints.Arealimplementationlikelyoccupieslesstotalboardspace.Changingcomponentscan improveordegradeEVMperformance.Forexample,addingalargeroutputcapacitorreducesoutput voltageundershootbutlengthensresponsetimeafteraloadtransientevent.Duetotheinternal compensation,theinductorandoutputcapacitorshouldremainwithinthedatasheetlimitsinorderforthe boostconvertertoremaincontrolloopstability. 3.2 Output Voltage TheTPS61166'sLEDcurrentisadjustableandissetbyresistorR1.TochangetheLEDcurrent,theuser shouldconsultthedatasheetonhowtoproperlysizeR1. 3.3 VBAT > 6V TheEVMisshippedwithJP4'sshuntinstalledwhichtiesV toV .IftheEVM'sinputpowersupplyis BAT IN higherthan6V,JP4mustberemovedtopreventtheV pinfrombeingdamaged.WithJP4removed,pin IN 1ofJP1isnolongerpulledup.So,theusermustapplyanexternalvoltagebetween1.2vand6VtoEN (themiddlepinofJP1)inordertoenablethedevice.Alternatively,theusercaninstalla590kW resistoron theR3footprint.ThisresistorandtheinternalpulldownresistoronENformaresistordividerfromV BAT whichprovidesapullupvoltagebetween1.2Vand6Vfor4.5V<V <10V. BAT 4 Schematic Figure1.TPS61166EVMSchematic 4 TPS61166EVM-446User'sGuide SLVU326–October2009 SubmitDocumentationFeedback

www.ti.com ConnectorandTestPointDescriptions 5 Connector and Test Point Descriptions 5.1 J1 –VBAT ThisheaderisthepositiveconnectiontotheinputpowersupplyandistiedtotheICsVBATpin.Theuser mustconnectthepowersupplybetweenJ1andJ3(GND).Theleadstotheinputsupplyshouldbetwisted andkeptasshortaspossible.Theinputvoltagemustbebetween1.6-Vand6-V. 5.2 J2 – VBAT and GND Kelvin Sense Althoughnotinstalled,thisheaderprovidesKelvinsenseconnectionsacrossinputcapacitorC1. 5.3 J3 – GND ThisheaderisthereturnconnectiontotheinputpowersupplyandistiedtotheICsGNDpin.Theuser mustconnectthepowersupplybetweenJ3andJ1(VIN).Theleadstotheinputsupplyshouldbetwisted andkeptasshortaspossible.Theinputvoltagemustbebetween1.6-Vand6-V. 5.4 J4– OUT (LED+) ThisheaderconnectstotheIC'sOUTpin.AfterremovingtheshuntonJP4,theusercanattachtheanode ofanoff-boardLEDstringbetweenthispinandJ5. 5.5 J5– FB (LED-) ThisheaderconnectstotheIC'sFBpin.AfterremovingtheshuntonJP4,theusercanattachthecathode ofanoff-boardLEDstringbetweenthispinandJ4. 5.6 JP1– EN ThemiddlepinofthisjumpertiestotheIC'sENpin.WhenJP4'sshuntisinstalled,placingJP1'sshuntat ONtiesthemiddleENpintoVBAT=VINtherebyturningontheboostconverter.Removingtheshuntfrom thisjumperallowstheIC'sinternalpulldownresistortopullittoground(ormovingtheshunttotheOFF position)therebydisablingtheconverter.WhenJP4'sshuntisnotinstalled,pin1ofJP1isnolonger pulledup.So,theusermustapplyanexternalvoltagebetween1.2vand6VtoEN(themiddlepinofJP1) inordertoenablethedevice.Alternatively,theusercaninstalla590kW resistorontheR3footprint.This resistorandtheinternalpulldownresistoronENformaresistordividerfromV whichprovidesapull BAT upvoltagebetween1.2Vand6Vfor4.5V<V <10V.WithR3installed,theusermustmoveJP1's BAT shunttotheOFFpositioninordertodisabletheconverter. 5.7 JP2 – PWM ThemiddlepinofthisjumpertiestotheIC'sPWMpin.TheusercanapplyanexternalPWMsignalwithin thevoltageandfrequencyrangesspecifiedinTable1tothispintoimplementPWMdimmingoftheLEDs. For100%fullbrightness,theusercanplaceJP2'sshunttotheENpositiontherebytyingthePWMpinto theENpinvoltage.TheusercanalsocompletelydisconnecttheLEDsfromtheboostconverteroutput, therebyturningthemoff,bymovingJP2'sshunttoGND. 5.8 JP3 – D1-D4 ON ThisjumperisinserieswiththeonboardLEDs.Theusercanremovethisjumpersshuntandreplaceit withanammeterinordertomeasuretheLEDcurrent.Theusermustremovethisjumperifoff-board LEDsarebeingconnectedbetweenJ4andJ5. SLVU326–October2009 TPS61166EVM-446User'sGuide 5 SubmitDocumentationFeedback

TestSetupandResults www.ti.com 5.9 TP1 – Test Point 1 ThistestpointconnectstotheIC'sVOpin.SincetheVOpinistheoutputoftheboostconverterbefore theinternalPWMdimmingswitching,theusercanmonitortheboostconverteroutputand,forexample, confirmthattheovervoltageprotectioncircuitproperlyclampstheoutputvoltageiftheLEDsareremoved fromtheoutput. 5.10 TP2 – Test Point 2 ThistestpointcanbeusedtomeasurethesmallsignalcontrolloopgainandphasewithVenable®or similargainphaseanalyzer.Forexample,theuserwouldreplacethe0-W resistorinR2witha49.9-100W resistorbeforeattachingaVenable®gain/phaseanalyzerbetweenheaderJ5andTP2. 6 Test Setup and Results 90 80 70 60 % y - 50 c n e 40 ci Effi 30 D E L 20 10 0 0 5 10 15 20 25 30 ILED - LED Current - mA Figure2.LEDEfficiency Vo-AC = 100 mV/div ILED = 20 mV/div IL= 500 mA/div Time = 200µs/div Figure3.1kHzPWMDimmingwithD=30% 6 TPS61166EVM-446User'sGuide SLVU326–October2009 SubmitDocumentationFeedback

www.ti.com EVMAssemblyDrawingsandLayout 7 EVM Assembly Drawings and Layout Figure4throughFigure6showthedesignofHPA446,theTPS61166EVM'sprintedcircuitboard.The EVMhasbeendesignedusinga2-Layer,1ozcopper-clad,2inchx2inchcircuitboard. Figure4.TPS61166EVM-446TopandSilkscreen(ViewedfromTop) SLVU326–October2009 TPS61166EVM-446User'sGuide 7 SubmitDocumentationFeedback

EVMAssemblyDrawingsandLayout www.ti.com Figure5.TPS61166EVM-446TopCopper Figure6.TPS61166EVM-446BottomLayer 8 TPS61166EVM-446User'sGuide SLVU326–October2009 SubmitDocumentationFeedback

www.ti.com EVMAssemblyDrawingsandLayout 7.1 Bill of Materials Table2liststheEVMcomponentsasconfiguredaccordingtotheschematicshowninFigure1. Table2.BillofMaterials Count RefDes Value Description Size PartNumber MFR 1 C1 4.7m F Capacitor,Ceramic,6.3V,X5R,20% 0603 Std Std 1 C2 0.1m F Capacitor,Ceramic,25V,X5R,20% 0603 Std Std 1 C3 0.1m F Capacitor,Ceramic,6.3V,X5R,20% 0603 Std Std 1 C4 1m F Capacitor,Ceramic,25V,X5R,20% 0603 Std Std 1 C5 1m F Capacitor,Ceramic,6.3V,X5R,20% 0603 Std Std 0 C6 Open Capacitor,Ceramic,6.3V,X5R,20% 0603 Std Std 0 J2,J5,J8 Open Header,Male2-pin,100milspacing 0.100inchx2 PEC02SAAN Sullins 6 J1,J3,J4,J6, PEC02SAAN Header,Male2-pin,100milspacing, 0.100inchx2 PEC02SAAN Sullins J7,J9 1 JP1 PEC02SAAN Header,2-pin,100milspacingInductor, 0.100inchx2 PEC02SAAN Sullins 1 L1 10uH SMT,1.4A,127milliohm 0.189x0.189inch LPS5030-103ML Coilcraft 1 R1 294k Resistor,Chip,1/16W,1% 0603 Std Std 1 R2 10.2k Resistor,Chip,1/16W,1% 0603 Std Std 0 R3 Open Resistor,Chip,1/16W,1% 0603 Std Std 1 R4 0 Resistor,Chip,1/16W,1% 0603 Std Std 1 R5 200k Resistor,Chip,1/16W,1% 0603 Std Std 0 TP1 Open TestPoint,Red,ThruHoleColorKeyed 0.100x0.100inch 5000 Keystone 1 U1 TPS61166DSK IC,LowInputBoostConverterwithIntegrated QFN TPS61166DSK TI PowerDiodeandIsolation SLVU326–October2009 TPS61166EVM-446User'sGuide 9 SubmitDocumentationFeedback

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