TPS63020评估手册

User'sGuideSLVU365–March2010TPS63020EVM-487Thisuser’sguidedescribesthecharacteristics,operation,anduseoftheTPS63020EVMevaluationmodule(EVM).TheEVMisdesignedtohelptheusereasilyevaluateandtesttheoperationandfunctionalityoftheTPS63020.Thisuser’sguideincludessetupinstructionsforthehardware,aschematicdiagram,abillofmaterials,andprinted-circuitboardlayoutdrawingsfortheevaluationmodule.Contents1Introduction..................................................................................................................12SetupandResults..........................................................................................................23BoardLayout................................................................................................................54SchematicandBillofMaterials...........................................................................................7ListofFigures1TurnONIntoElectronicLoad.............................................................................................32OutputRippleVin3V......................................................................................................43OutputRippleVin4V......................................................................................................44EfficiencyOverLi-IonCellRange........................................................................................55LoadStep100mAto500mA.............................................................................................56AssemblyLayer.............................................................................................................67TopLayerRouting..........................................................................................................68BottomLayerRouting......................................................................................................79Schematic....................................................................................................................7ListofTables1PerformanceSpecificationSummary.....................................................................................22TPS63020EVM-487BillofMaterials.....................................................................................81IntroductionTheTexasInstrumentsTPS63020isahighlyefficient,single-inductor,buck-boostconverterina14-pin,3-mm×4-mmQFNpackage.Bothfixedandadjustableoutputvoltageunitsareavailable.1.1BackgroundTheTPS63020EVM-487usestheTPS63020adjustableversionandissetto3.3-Voutput.TheEVMoperateswithfull-ratedperformancewithaninputvoltagebetween1.8Vand5.5V.1.2PerformanceSpecificationTable1providesasummaryoftheTPS63020EVM-487performancespecifications.Allspecificationsaregivenforanambienttemperatureof25°C.1SLVU365–March2010TPS63020EVM-487SubmitDocumentationFeedbackCopyright©2010,TexasInstrumentsIncorporatedSetupandResults=1000mA2.03.65.5VOutputvoltageIout=0mAto1000mA3.23.33.4VOutputcurrent3.6Vin010002500mAOperatingfrequency2400kHzEfficiency3.6Vinat1000-mAload90%Outputripple3.6Vinat500-mAload25mV1.3ModificationsTheprinted-circuitboard(PCB)forthisEVMisdesignedtoaccommodateboththefixedandadjustableversionsofthisintegratedcircuit(IC).Ifthefixedversionisinstalled,R1isreplacedwitha0-ΩresistorandR2isopen.Extrapositionsareavailableforadditionalinputandoutputcapacitors.1.3.1AdjustableOutputICU1OperationU1isconfiguredforevaluationoftheadjustableoutputversion.Thisunitissetto3.3V.ResistorsR1andR2areusedtosettheoutputvoltagebetween1.2Vand5.5V.Seethedatasheetforrecommendedvalues.1.3.2FixedOutputOperationU1canbereplacedwiththefixedversionforevaluation.Withthefixedversion,R1needstobereplacedwitha0-Ωresistor;R2positionisopen.2SetupandResultsThissectiondescribeshowtoproperlyusetheTPS63020EVM-487.2.1Input/OutputConnectorandHeaderDescriptions2.1.1J1–VINPositiveinputconnectionfromtheinputsupplyforU1.2.1.2J2–SenseVinSenseandGNDSense,lowcurrentsenselinesforsamplinginputvoltageatinputcapacitor.2.1.3J3–GNDVinGNDreturnconnectionfromtheinputsupplyforU1,commonwithJ6.2.1.4J4–VOUTOutputvoltageconnection.2.1.5J5–SenseVoutSenseandGNDSenselowcurrentsenselinesforsamplingoutputvoltageatoutputcapacitor.2.1.6J6–GNDVoutGNDreturnconnectionforoutputvoltage,commonwithJ3.2.1.7J7–PGGNDPowerGood(PG)testpointandGNDconnection.2TPS63020EVM-487SLVU365–March2010SubmitDocumentationFeedbackCopyright©2010,TexasInstrumentsIncorporatedVOUT1V/divENPin–ENABLEShortingjumperbetweenthecenterpinandONturnsontheunit.InstallingashortingjumperbetweenthecenterpinandOFFturnstheunitoff.2.1.9JP2–PWRSaveInstallingashortingjumperbetweenthecenterpinandOFFdisablespower-savingmode;jumperbetweencenterpinandONenablespower-savingmode.Thecenterpincanbeusedtosynchronizetheunitwithanexternalclock;seedatasheetforadditionaldetails.2.2SetupTooperatetheEVM,connectaninputsupplytotheappropriatepins,andconnectaloadtotheappropriatepins.2.3Power-UpThesoft-startcircuitiscontrolledbyarampto