User's Guide SLVU182–September2006 TPS75105EVM This user’s guide describes the characteristics, operation, and use of the TPS75105EVM-174 evaluation module (EVM). The EVM demonstrates the Texas Instruments TPS75105 low-dropout, two-bank LED driver with PWM brightness control. The document Includes setup instructions, a schematic diagram, a bill of materials, and PCBlayoutdrawingsfortheEVM. Contents 1 Introduction.......................................................................................... 1 2 Setup................................................................................................. 1 3 BoardLayout........................................................................................ 3 4 SchematicandBillofMaterials................................................................... 6 ListofFigures 1 AssemblyLayer..................................................................................... 4 2 TopLayerRouting.................................................................................. 5 3 BottomLayerRouting.............................................................................. 6 4 TPS75105EVM-174Schematic................................................................... 7 ListofTables 1 TPS75105EVM-174BillofMaterials............................................................. 7 1 Introduction TheTexasInstrumentsTPS75105EVM-174evaluationmodule(EVM)helpsdesignersevaluatethe operationandperformanceoftheTPS75105low-dropoutlinearregulator(LDO),two-bankLEDdriverwith PWMdimming.TheTPS75100containsfour,current-regulated,LEDdriveroutputsandoperatesfroma 2.7-Vto5.5-Vinputsupply.TheICdrivestheanodesoftwobanksoftwoLEDs.Eachbankisenabled independentlyandcanbedimmedusingaPWMsignaltotheENpin.TheLEDcurrentisprogrammed usingaresistorfromISETtoGND.TheEVMhasjumpersforbothENinputpinsforeasyevaluation.The LDOtopologyandthe9-ballchipscalepackageprovideasmall-footprintsolutionforbattery-poweredLED driverapplications. 2 Setup ThissectiondescribesthejumpersandconnectorsontheEVMaswellashowtoproperlyconnect,set up,andusetheTPS75105EVM-174. 2.1 Input/Output Connector Descriptions 2.1.1 J1–VIN Thisisthepositiveinputvoltageconnectiontotheconverter.TheEVMoperatesfromanysupplyvoltage between2.7Vand5.5V.Theleadstotheinputsupplyshouldbetwistedandkeptasshortaspossibleto minimizeEMItransmissionandinputvoltagedroop. SLVU182–September2006 TPS75105EVM 1 SubmitDocumentationFeedback

www.ti.com Setup 2.1.2 J2–GND Thisistheinputreturnconnectionfortheinputpowersupply. 2.1.3 JP1–Bank-AEnable JP1isusedtoenablethebank-ALEDs.PlaceashortingbarintheONpositiontoturnonthebank-A LEDs.Whenthebank-ALEDsareenabled,theLEDcurrentthroughLEDsD1AandD2Aisregulatedto thevalueprogrammedatISET(5mA).PlaceashortingbarintheOFFpositiontoturnoffthebank-A LEDs. 2.1.4 JP2–Bank-BEnable JP2isusedtoenablethebank-BLEDs.PlaceashortingbarintheONpositiontoturnonthebank-B LEDs.Whenthebank-BLEDsareenabled,theLEDcurrentthroughLEDsD1BandD2Bisregulatedto thevalueprogrammedatISET(5mA).PlaceashortingbarintheOFFpositiontoturnoffthebank-B LEDs. 2.1.5 JP3–LEDD1ACathodeConnection JP3isusedtomeasurethecurrentthroughLEDD1A.PlaceacurrentmeterbetweenthepinsofJP3to measurethecurrent.Alternatively,aresistorcanbeconnectedbetweenthepinsofJP3inorderto measurethecurrentasavoltage.PlaceashortingbaracrossthepinsofJP3ifcurrentmeasurementis notrequired.PCBpadsareprovidedtoinstallacurrent-senseresistoracrossthisjumper. 2.1.6 JP4–LEDD2ACathodeConnection JP4isusedtomeasurethecurrentthroughLEDD2A.PlaceacurrentmeterbetweenthepinsofJP4to measurethecurrent.Alternatively,aresistorcanbeconnectedbetweenthepinsofJP4inorderto measurethecurrentasavoltage.PlaceashortingbaracrossthepinsofJP4ifcurrentmeasurementis notrequired.PCBpadsareprovidedtoinstallacurrent-senseresistoracrossthisjumper. 2.1.7 JP5–LEDD2BCathodeConnection JP5isusedtomeasurethecurrentthroughLEDD2B.PlaceacurrentmeterbetweenthepinsofJP5to measurethecurrent.Alternatively,aresistorcanbeconnectedbetweenthepinsofJP5inorderto measurethecurrentasavoltage.PlaceashortingbaracrossthepinsofJP5ifcurrentmeasurementis notrequired.PCBpadsareprovidedtoinstallacurrent-senseresistoracrossthisjumper. 2.1.8 JP6–LEDD1BCathodeConnection JP6isusedtomeasurethecurrentthroughLEDD1B.PlaceacurrentmeterbetweenthepinsofJP6to measurethecurrent.Alternatively,aresistorcanbeconnectedbetweenthepinsofJP6inorderto measurethecurrentasavoltage.PlaceashortingbaracrossthepinsofJP6ifcurrentmeasurementis notrequired.PCBpadsareprovidedtoinstallacurrent-senseresistoracrossthisjumper. 2.2 Setup 2.2.1 EVMFactoryConfiguration TheEVMisconfiguredtoprovidethefollowingnominaloperatingconditions: Inputvoltage:2.5Vto5.5V LEDcurrent:5mA 2 TPS75105EVM SLVU182–September2006 SubmitDocumentationFeedback

www.ti.com BoardLayout 2.2.2 ChangingLEDCurrent R1ontheEVMisusedtochangethecurrent.TheEVMisprovidedwithnoresistorinstalledonR1.This programsthedefaultLEDcurrentof5mA.InordertoprogramadifferentLEDcurrent,placea1% resistoratR1thatcorrespondstothefollowingequation: R1=(1.22V/I )· 420 LED NotethatI istheLEDcurrentthrougheachLED. LED 2.2.3 UsingPWMDimming AneasydimmingsolutionisimplementedbyconnectingaPWMsignaltoENAorENBtodimthe respectivebankofLEDs.ThePWMsignalmaybeupto1kHz.ThescaleoftheLEDcurrentcorresponds directlytothedutycycleofthesignal.Forexample,a50%dutycycleprovides50%oftheprogrammed LEDcurrent.Thetwobanksmaybeindependentlydimmed. 2.2.4 Operation 1. ConfigureJP1toenableordisablethebank-ALEDsasdesired. 2. ConfigureJP2toenableordisablethebank-BLEDsasdesired. 3. ConfigureJP3–JP6tomeasureLEDcurrent. 4. ConnecttheinputvoltagereturntoJ2. 5. ConnectthepositiveinputvoltagetoJ1. 6. Turnoninputvoltage. 7. TheLEDsthatwereenabledbyJP1andJP2areon. 3 Board Layout ThissectionprovidestheTPS75105EVM-174boardlayoutandillustrations. SLVU182–September2006 TPS75105EVM 3 SubmitDocumentationFeedback

www.ti.com BoardLayout 3.1 Layout Figure1,Figure2,andFigure3showtheboardlayoutfortheTPS75105EVM-174PWB. Figure1.AssemblyLayer 4 TPS75105EVM SLVU182–September2006 SubmitDocumentationFeedback

www.ti.com BoardLayout Figure2.TopLayerRouting SLVU182–September2006 TPS75105EVM 5 SubmitDocumentationFeedback

www.ti.com SchematicandBillofMaterials Figure3.BottomLayerRouting 4 Schematic and Bill of Materials ThissectionprovidestheTPS75105EVM-174schematicandbillofmaterials. 6 TPS75105EVM SLVU182–September2006 SubmitDocumentationFeedback

www.ti.com SchematicandBillofMaterials 4.1 Schematic Figure4.TPS75105EVM-174Schematic 4.2 Bill of Materials Table1.TPS75105EVM-174BillofMaterials Count RefDes Value Description Size PartNumber MFR 1 C1 1.0m F Capacitor,Ceramic,16V,X5R,10% 0603 C1608X5R1C105K TDK 4 D1A,D1B, Diode,LED,White,30mA 1210 SML-LX2832UWC- Lumex D2A,D2B TR 2 J1,J2 Header,2pin,100milspacing,(36-pinstrip) 0.100· 2 PTC36SAAN Sullins 2 JP1,JP2 Header,3pin,100milspacing,(36-pinstrip) 0.100· 3 PTC36SAAN Sullins 4 JP3–JP6 Header,2pin,100milspacing,(36-pinstrip) 0.100· 2 PTC36SAAN Sullins 0 R1 Open Resistor,Cip,1/16W,1% 0603 1 U1 IC,LDO,TwoBankLEDDriver1/PWM WCSP-0 TPS75105YFF TI BrightnessControl 1 — PCB,1.8In· 1.2In· 0.062In HPA174 Any 6 — Shunt,100mil,Black 0.100 929950-00 3M 4.3 Related Documentation From Texas Instruments TPS7510x,LowDropout,Two-BankLEDDriverwithPWMBrightnessControldatasheet(SBVS080) 4.4 If You Need Assistance ContactyourlocalTIsalesrepresentative. SLVU182–September2006 TPS75105EVM 7 SubmitDocumentationFeedback

EVALUATIONBOARD/KITIMPORTANTNOTICE TexasInstruments(TI)providestheenclosedproduct(s)underthefollowingconditions: Thisevaluationboard/kitisintendedforuseforENGINEERINGDEVELOPMENT,DEMONSTRATION,OREVALUATION PURPOSESONLYandisnotconsideredbyTItobeafinishedend-productfitforgeneralconsumeruse.Personshandlingthe product(s)musthaveelectronicstrainingandobservegoodengineeringpracticestandards.Assuch,thegoodsbeingprovidedare notintendedtobecompleteintermsofrequireddesign-,marketing-,and/ormanufacturing-relatedprotectiveconsiderations, includingproductsafetyandenvironmentalmeasurestypicallyfoundinendproductsthatincorporatesuchsemiconductor componentsorcircuitboards.Thisevaluationboard/kitdoesnotfallwithinthescopeoftheEuropeanUniondirectivesregarding electromagneticcompatibility,restrictedsubstances(RoHS),recycling(WEEE),FCC,CEorUL,andthereforemaynotmeetthe technicalrequirementsofthesedirectivesorotherrelateddirectives. Shouldthisevaluationboard/kitnotmeetthespecificationsindicatedintheUser’sGuide,theboard/kitmaybereturnedwithin30 daysfromthedateofdeliveryforafullrefund.THEFOREGOINGWARRANTYISTHEEXCLUSIVEWARRANTYMADEBY SELLERTOBUYERANDISINLIEUOFALLOTHERWARRANTIES,EXPRESSED,IMPLIED,ORSTATUTORY,INCLUDING ANYWARRANTYOFMERCHANTABILITYORFITNESSFORANYPARTICULARPURPOSE. Theuserassumesallresponsibilityandliabilityforproperandsafehandlingofthegoods.Further,theuserindemnifiesTIfromall claimsarisingfromthehandlingoruseofthegoods.Duetotheopenconstructionoftheproduct,itistheuser’sresponsibilityto takeanyandallappropriateprecautionswithregardtoelectrostaticdischarge. EXCEPTTOTHEEXTENTOFTHEINDEMNITYSETFORTHABOVE,NEITHERPARTYSHALLBELIABLETOTHEOTHER FORANYINDIRECT,SPECIAL,INCIDENTAL,ORCONSEQUENTIALDAMAGES. TIcurrentlydealswithavarietyofcustomersforproducts,andthereforeourarrangementwiththeuserisnotexclusive. TIassumesnoliabilityforapplicationsassistance,customerproductdesign,softwareperformance,orinfringementof patentsorservicesdescribedherein. PleasereadtheUser’sGuideand,specifically,theWarningsandRestrictionsnoticeintheUser’sGuidepriortohandlingthe product.Thisnoticecontainsimportantsafetyinformationabouttemperaturesandvoltages.ForadditionalinformationonTI’s environmentaland/orsafetyprograms,pleasecontacttheTIapplicationengineerorvisitwww.ti.com/esh. NolicenseisgrantedunderanypatentrightorotherintellectualpropertyrightofTIcoveringorrelatingtoanymachine,process,or combinationinwhichsuchTIproductsorservicesmightbeorareused. FCCWarning Thisevaluationboard/kitisintendedforuseforENGINEERINGDEVELOPMENT,DEMONSTRATION,OREVALUATION PURPOSESONLYandisnotconsideredbyTItobeafinishedend-productfitforgeneralconsumeruse.Itgenerates,uses,and canradiateradiofrequencyenergyandhasnotbeentestedforcompliancewiththelimitsofcomputingdevicespursuanttopart15 ofFCCrules,whicharedesignedtoprovidereasonableprotectionagainstradiofrequencyinterference.Operationofthis equipmentinotherenvironmentsmaycauseinterferencewithradiocommunications,inwhichcasetheuserathisownexpense willberequiredtotakewhatevermeasuresmayberequiredtocorrectthisinterference. EVMWARNINGSANDRESTRICTIONS ItisimportanttooperatethisEVMwithintheinputvoltagerangeof2.7Vto5.5V. Exceedingthespecifiedinputrangemaycauseunexpectedoperationand/orirreversibledamagetotheEVM.Ifthereare questionsconcerningtheinputrange,pleasecontactaTIfieldrepresentativepriortoconnectingtheinputpower. Applyingloadsoutsideofthespecifiedoutputrangemayresultinunintendedoperationand/orpossiblepermanentdamagetothe EVM.PleaseconsulttheEVMUser'sGuidepriortoconnectinganyloadtotheEVMoutput.Ifthereisuncertaintyastotheload specification,pleasecontactaTIfieldrepresentative. Duringnormaloperation,somecircuitcomponentsmayhavecasetemperaturesgreaterthan85(cid:176) C.TheEVMisdesignedto operateproperlywithcertaincomponentsabove60(cid:176) Caslongastheinputandoutputrangesaremaintained.Thesecomponents includebutarenotlimitedtolinearregulators,switchingtransistors,passtransistors,andcurrentsenseresistors.Thesetypesof devicescanbeidentifiedusingtheEVMschematiclocatedintheEVMUser'sGuide.Whenplacingmeasurementprobesnear thesedevicesduringoperation,pleasebeawarethatthesedevicesmaybeverywarmtothetouch. MailingAddress:TexasInstruments,PostOfficeBox655303,Dallas,Texas75265 Copyright©2006,TexasInstrumentsIncorporated

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