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User's Guide SLOU310 –September 2011 TPA2025D1 Audio Power AmplifierEvaluationModule This document describesthe operationof the TPA2025D1 evaluationmodule thatusers may use to evaluatetheTPA2025D1 AudioPower Amplifier.IncludedaretheTPA2025D1EVM schematic,boardart, and billofmaterials.

Contents

1 Introduction

Thissectionprovidesan overviewoftheTexas Instruments(TI)TPA2025D1 audiopower amplifier evaluationmodule (EVM).Itincludesa briefdescriptionofthemodule and a listofspecifications.

1.1 Description

The TPA2025D1 isa high-efficiency,class-D,audiopower amplifierand an integratedboostconverter.It drivesup to2 W intoa 4-Ω speakerfromlowsupplyvoltages. The TPA2025D1 audiopower amplifierEVM isa complete,stand-aloneaudioamplifier.Itcontainsthe TPA2025D1 WCSP (YZG) Class-Daudiopower amplifierwithan integratedboostconverter.All components and theEVM arePb-Free. 1SLOU310 –September 2011 TPA2025D1 AudioPower AmplifierEvaluationModule SubmitDocumentationFeedback Copyright© 2011,Texas InstrumentsIncorporated

Operation www.ti.com

1.2 TPA2025D1 Specifications

VBAT Supplyvoltagerange 2.5V to5.2V IDD Supplycurrent 3 A Maximum PO Continuousoutputpower perchannel,4 Ω,VBAT = 3.6V 2 W VI Audioinputvoltage 0 V toVBAT R L Minimum loadimpedance 4 Ω

2 Operation

Thissectiondescribeshow tooperatetheTPA2025D1EVM.

2.1 Quick-StartListforStand-AloneOperation

Use thefollowingstepswhen operatingtheTPA2025D1EVM as a stand-aloneorwhen connectingthe EVM intoexistingcircuitsorequipment.

2.1.1 Power and Ground

1. Ensuretheexternalpower sourcesaresettoOFF. 2. Setthepower supplyvoltagebetween 2.3V and 5.2V.When connectingthepower supplytothe EVM, attachthepower supplygroundconnectiontotheGND connectorfirst,and thenconnectthe positivesupplytotheVDD connector.Verifythatcorrectconnectionsaremade tothebanana jacks.

2.1.2 Audio

1. Ensurethattheaudiosourceissettotheminimum level. 2. ConnecttheaudiosourcetotheinputRCA jackIN.Incase ofdifferentialaudioinput,ensurethatthe jumper,JP SE ,isnotinserted.Incase ofa single-endedaudioinput,ensurethatthejumper,JP SE, is inserted,therebygroundingIN+ throughtheinputcapacitorC2. 3. Connecta speaker(4Ω to32 Ω)totheoutputbanana jacks,OUT+ and OUT –. 4. FLT Out+ and FLT OUT- testpointsallowtheusertoconnecttheoutputsoftheamplfierthroughan RC filterforaudiomeasurements.(Many audioanalyzerswillnotgivethecorrectreadingson a Class-Damplifierwithoutadditionalfiltering.)Note thattheusermust providethenecessaryresistors, R7 and R8 tocompletethefilters.The typicalvalueforR7 and R8 is1.0kΩ. 5. The filteredoutputoftheTPA2025D1 can be measured between testpointsFILT OUT – and FILT OUT+

2.1.3 AGC Control

The TPA2025D1 has threeselectableinflectionpointsettings:3.25V,3.55V,and 3.75V. 1. Remove thejumper,AGC ,toselectthe3.25-Vinflectionpoint(AGC1). 2. Installthejumper,AGC ,between pins2 and 3 toselectthe3.55-Vinflectionpoint(AGC2). 3. Installthejumper,AGC, between pins1 and 2 toselectthe3.75-Vinflectionpoint(AGC3).

2.1.4 AmplifierGain

The TPA2025D1 has a fixedsettingof20 dB.

2.1.5 Shutdown Controls

1. The TPA2025D1 providesshutdowncontrolfortheClass-Damplifierand theboostconverter.The EN pinenablestheboostconverterand Class-Damplifier.Itisactivehigh. 2. Pressand holdpushbuttonS1 toplacetheboostconverterand theClass-Damplifierinshutdown. ReleasepushbuttonS1 toactivatetheClass-Damplifierand boostconverter.The boostconverteronly turnson ifan audiosignal(> 2 VPEAK )ispresentatone oftheoutputs(OUT+ orOUT-).

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PVDDI = I VBAT 0.8 /c230 /c246/c180/c231 /c247 /c180/c232 /c248 L BOOST VBAT (PVD D VBAT)L = ΔI PVDD /c180 /c45 /c180 /c180 f www.ti.com Operation NOTE: The TPA2025D1 has an autopass-throughmode. Under normaloperation(EN = HIGH),the boostconverterautomaticallyturnsoffifno audiosignalispresentatone oftheinputs(IN+ orIN-).

2.2 Boost Settings

The defaultvoltagefortheboostconverteris5.9V (unloaded)and cannotbe changed.Ifno audiosignal ispresent,theboostconverterisautomaticallydisabled.Once theaudiosignalispresentatIN+ and IN-, theboostconverterenablesautomatically,when theoutputsignalexceeds2 VPEAK .

2.2.1 Boost Terms

The followingisa listoftermsand definitions: C MIN Minimum boostcapacitancerequiredfora givenripplevoltageon PVOUT (PVDD) L Boostinductor fboost Switchingfrequencyoftheboostconverter IPVDD Currentpulledby theclass-Damplifierfromtheboostconverter IPVDD Currentpulledby theclass-Damplifierfromtheboostconverter IL Currentthroughtheboostinductor. PVDD (PVOUT) Supplyvoltagefortheclass-Damplifier(Voltagegeneratedby theboostconverter output) VBAT (VDD) SupplyvoltagetotheTPA2025D1 (SupplyvoltagetotheEVM). ΔIL Ripplecurrentthroughtheinductor. ΔV Ripplevoltageon PVOUT (PVDD) due tocapacitance

2.2.2 Changing theBoost Inductor

Workinginductancedecreasesas inductorcurrentincreases.Ifthedropinworkinginductanceissevere enough,itmay cause theboostconvertertobecome unstable,orcause theTPA2025D1 toreachits currentlimitata loweroutputpower thanexpected.Inductorvendorsspecifycurrentsatwhichinductor valuesdecreaseby a specificpercentage.Thiscan varyby 10% to35%. Inductanceisalsoaffectedby dc currentand temperature. Inductorcurrentratingisdeterminedby therequirementsoftheload.The inductanceisdeterminedby two factors:theminimum valuerequiredforstabilityand themaximum ripplecurrentpermittedinthe application. Use Equation1 todeterminetherequiredcurrentrating.Equation1 shows theapproximaterelationship between theaverageinductorcurrent,IL,totheloadcurrent,loadvoltage,and inputvoltage(IPVDD , PVOUT, and VBAT, respectively.)InsertIPVDD ,PVDD, and VBAT intoEquation1 tosolveforIL.The inductormust maintainatleast90% ofitsinitialinductancevalueatthiscurrent. (1) The minimum workinginductanceis1.3μH. A lowervaluemay cause instability. Ripplecurrent,ΔIL,ispeak-to-peakvariationininductorcurrent.Smallerripplecurrentreducescorelosses intheinductoras wellas thepotentialforEMI.Use Equation2 todeterminethevalueoftheinductor,L. Equation2 shows therelationshipsamong inductanceL,VBAT, PVDD, theswitchingfrequency,fboost,and ΔIL.Insertthemaximum acceptableripplecurrentintoEquation2 tosolveforL. (2) 3SLOU310 –September 2011 TPA2025D1 AudioPower AmplifierEvaluationModule SubmitDocumentationFeedback Copyright© 2011,Texas InstrumentsIncorporated

I (PVD D VB AT)C = 1.5 V PVD D /c180 /c45/c180 /c68 /c180 /c180 f PVD D BOOST I (PV DD V BAT)C = V PV DD /c180 /c45 /c68 /c180 /c180 f Operation www.ti.com ΔIL isinverselyproportionaltoL.MinimizeΔIL as much as isnecessaryfora specificapplication.Increase theinductancetoreducetheripplecurrent.Note thatmaking theinductancetoolargepreventstheboost converterfromrespondingtofastloadchanges properly.TypicalinductorvaluesfortheTPA2025D1 are 2.2μH to4.7μH. Selectan inductorwitha smalldc resistance,DCR. DCR reducestheoutputpower due tothevoltage dropacrosstheinductor.

2.2.3 Changing theBoost Capacitor

The valueoftheboostcapacitorisdeterminedby theminimum valueofworkingcapacitancerequiredfor stabilityand themaximum voltagerippleallowedon PVOUT intheapplication.The minimum valueof workingcapacitanceis4.7μF.Do notuse any component witha workingcapacitancelessthan4.7μF. Workingcapacitanceisdefinedas theratedcapacitancereducedby theDC Biasfactor,temperature,and agingparametersofthecapacitorbeingused.Itmay be necessarytorequesttheseparametersfromthe capacitormanufacturer.Forbestperformance,onlyconsiderceramiccapacitorswithX5R orX7R dielectric. ForX5R orX7R ceramiccapacitors,Equation3 shows therelationshipsamong theboostcapacitance,C, toloadcurrent,loadvoltage,ripplevoltage,inputvoltage,and switchingfrequency(IPVOUT ,PVOUT, ΔV, VDD, fboost respectively).Insertthemaximum allowedripplevoltageintoEquation3 tosolveforC. A factor ofabout1.5isincludedtoaccountforcapacitancelossdue todc voltageand temperature. (3) Foraluminum ortantalumcapacitors,Equation4 shows therelationshipsamong theboostcapacitance, C, toloadcurrent,loadvoltage,ripplevoltage,inputvoltage,and switchingfrequency(IPVOUT ,PVOUT, ΔV, VDD, fboost respectively).Insertthemaximum allowedripplevoltageintoEquation4 tosolveforC. Solve thisequationassumingESR iszero. (4) Capacitanceofaluminum and tantalumcapacitorsisnormallyinsensitivetoappliedvoltage,so no factor of1.5isincludedinEquation4.However,theESR inaluminum and tantalumcapacitorscan be significant.Choose an aluminum ortantalumcapacitorwithan ESR around30 m Ω.Forbestperformance withtantalumcapacitors,use atleasta 10-V rating.Note thattantalumcapacitorsmust generallybe used atvoltagesofhalftheirratingsorless.

2.3 Power Up

1. Verifythatthecorrectconnectionsareas describedinSection2.1. 2. Verifythatthevoltagesettingofthepower supplyisbetween 2.5V and 5.2V,and turnon thepower supply.ProperoperationoftheEVM begins. 3. Adjusttheaudiosignalsourceas needed.

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1 OUT+

0.5in 0.5in 0.5in 0.5in 0.5in 0.5in 0.5in 0.5in IN 100ohms/4A FB1 MPZ2012S101A 100ohms/4A FB2 MPZ2012S101A 10ufd/10V 1.00K 1 2 R4 22ufd/10V DNP 6.8V A1A2 D1 D2 A1A2B3 A3 D1 D2 AGNDPGNDBGNDEN AGC IN+ OUT- OUT+ PVDDVBA T SW GND GND AGC DNP TVS2 DNP TVS1 DNP GND GND 0.0 1 2R100 0.0 R101 2.2uH 1 2 GND JP SE GND FLT OUT- GND C11 0.1ufd/16V GND GND TP2 GND TP1 GND FLT OUT+ 1.0ufd/10V 1 2 1.0ufd/10V 1 2 C12 2 1 0.1ufd/16V GND TP A2025D1YZG STANDOFF HARDWARE www.ti.com Reference

3 Reference

ThissectionincludestheEVM schematic,boardlayoutreference,and partslist.

3.1 TPA2025D1EVM Schematic

Figure1.TPA2025D1EVM Schematic 5SLOU310 –September 2011 TPA2025D1 AudioPower AmplifierEvaluationModule SubmitDocumentationFeedback Copyright© 2011,Texas InstrumentsIncorporated

Reference www.ti.com

3.2 TPA2025D1EVM PCB Layers

Figure2.EVM Assembly Layer Spacer Figure3.EVM Top Layer

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www.ti.com Reference Figure4.EVM Layer 2 Spacer Figure5.EVM Layer 3 7SLOU310 –September 2011 TPA2025D1 AudioPower AmplifierEvaluationModule SubmitDocumentationFeedback Copyright© 2011,Texas InstrumentsIncorporated

Reference www.ti.com Figure6.EVM Bottom Layer

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www.ti.com Reference

3.3 TPA2025D1EVM BillofMaterials

Table1.TPA2025D1EVM BillofMaterials REFITEM MANU PARTNUM QTY VENDOR PARTNUM DESCRIPTION VENDOR MANUFACTURERDESIGNATORS TEXAS TEXAS1 TPA2025D1YZG 1 U1 TPA2025D1YZG AudioPower Amplifier INSTRUMENTS INSTRUMENTS SEMICONDUCTORS STTRANSIENT VOLTAGE SUPPRESSION2 ESDALC6V1-1BT2 (0)DNP TVS1,TVS2 ESDALC6V1-1BT2 MOUSER MICROELECTRONIBIDIR 6.1V9A SOD-882 ROHS CS CAPACITORS CAP SMD0603 CERM 1000PFD 50V 5%3 C1608C0G1H102J 2 C7,C8 445-1293-1 DIGI-KEY TDK CORP.COG ROHS CAP SMD0603 CERM 4700PFD 50V 10%4 ECJ-1VB1H472K 2 C9,C10 PCC1780CT DIGI-KEY PANASONICX7R ROHS CAP SMD0805 CERM 10UFD 10V10% X7R5 GRM21BR71A106KE51L 1 C3 490-3905-1 DIGI-KEY MURATAROHS CAP SMD0805 CERM 22UFD 10V 20% X5R6 LMK212BJ226MG-T 1 C5 587-1958-1 DIGI-KEY TAIYO YUDENROHS CAP SMD0603 CERM 0.1UFD 16V 10% X7R7 ECJ-1VB1C104K 2 C11,C12 PCC1762CT DIGI-KEY PANASONICROHS CAP SMD0603 CERM 1.0UFD 10V 10% X5R8 GRM185R61A105KE36D 2 C1,C2 490-3893-1 DIGI-KEY MURATAROHS RESISTORS R5 P100KGCT RESISTOR SMD0603 100K OHM 5% THICK9 ERJ-3GEYJ104V 1 DIGI-KEY PANASONICFILM 1/10W ROHS RESISTOR SMD0603 THICK FILM 1.00K10 RC0603FR-071KL 1 R4 311-1.00KHRCT DIGI-KEY YAGEOOHM 1% 1/10W ROHS RESISTOR SMD0603 0.0OHM 5% THICK11 ERJ-3GEY0R00V 2 R100,R101 P0.0GCT DIGI-KEY PANASONICFILM 1/10W ROHS INDUCTORS INDUCTOR POWER SMD1008 2.2uH12 1239AS-H-2R2N=P2 1 L1 1239AS-H-2R2N=P2 TOKO JAPAN TOKO JAPANRDC=80mOHMS 2.3ADFE252012C ROHS 13 MMSZ5235BT1 (0)DNP D1 ZENER DIODE,6.8V,SMT SOD-123 FERRITE BEAD, 100 Ohms 4A 100MHz14 MPZ2012S101A 2 FB1,FB2 445-1567-1 DIGI-KEY TDKSM0805 ROHS 9SLOU310 –September 2011 TPA2025D1 AudioPower AmplifierEvaluationModule SubmitDocumentationFeedback Copyright© 2011,Texas InstrumentsIncorporated

Reference www.ti.com Table1.TPA2025D1EVM BillofMaterials(continued) REFITEM MANU PARTNUM QTY VENDOR PARTNUM DESCRIPTION VENDOR MANUFACTURERDESIGNATORS HEADERS, JACKS, AND SHUNTS 15 26630301RP2 1 AGC 2663S-03 HEADER 3 PIN,PCB 2.0MM ROHS DIGI-KEY NORCOMP 16 26630201RP2 1 JP SE 2663S-02 HEADER 2 PIN,PCB 2.0MM ROHS DIGI-KEY NORCOMP

17 PJRAN1X1U01X 1 IN 65K7770 JACK, RCA 3-PINPCB-RA BLACK ROHS NEWARK SWITCHCRAFT

18 810-002-SP2L001 2 JP SE, AGC (1) SP2-001E SHUNT, BLACK AU FLASH 2 MM ROHS DIGI-KEY NORCOMP TESTPOINTS AND SWITCHES KEYSTONE19 5002 1 FLT OUT- 5002K PC TESTPOINT, WHITE, ROHS DIGI-KEY ELECTRONICS KEYSTONE20 5001 2 TP1 GND,TP2 GND 5001K PC TESTPOINT, BLACK, ROHS DIGI-KEY ELECTRONICS KEYSTONE21 5000 1 FLT OUT+ 5000K PC TESTPOINT, RED, ROHS DIGI-KEY ELECTRONICS STANDOFFS AND HARDWARE

22 TL1015AF160QG 1 S1 EG4344CT SWITCH, MOM, 160G SMT 4X3MM ROHS DIGI-KEY E-SWITCH

STANDOFF,4-40,0.5INx3/16IN,ALUMRND KEYSTONE23 2027 4 SO1,SO2,SO3,SO4 2027K DIGI-KEYF-F ELECTRONICS GND, VDD, OUT+,24 111-2223-001 4 J587 BINDING-POST,NONINS,THRU,ROHS DIGI-KEY EMERSON NPCSOUT- COMPONENTS NOT ASSEMBLED

25 R0603_DNP 2 R7, R8

26 C0603_DNP 2 C4, C6

(1) PlaceShuntsOnlyOn Pin2ofJP SE and on Pin3ofAGC

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EvaluationBoard/KitImportantNotice Texas Instruments(TI)providestheenclosedproduct(s)underthefollowingconditions: Thisevaluationboard/kitisintendedforuse forENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and isnotconsideredby TItobe a finishedend-productfitforgeneralconsumer use.Personshandlingthe product(s)must have electronicstrainingand observegood engineeringpracticestandards.As such,thegoods beingprovidedare notintendedtobe completeintermsofrequireddesign-,marketing-,and/ormanufacturing-relatedprotectiveconsiderations, includingproductsafetyand environmentalmeasures typicallyfoundinend productsthatincorporatesuch semiconductor components orcircuitboards.Thisevaluationboard/kitdoes notfallwithinthescope oftheEuropean Uniondirectivesregarding electromagneticcompatibility,restrictedsubstances(RoHS),recycling(WEEE), FCC, CE orUL, and thereforemay notmeet the technicalrequirementsofthesedirectivesorotherrelateddirectives. Shouldthisevaluationboard/kitnotmeet thespecificationsindicatedintheUser’s Guide,theboard/kitmay be returnedwithin30 days fromthedateofdeliveryfora fullrefund.THE FOREGOING WARRANTY ISTHE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND ISIN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED,OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. The userassumes allresponsibilityand liabilityforproperand safehandlingofthegoods.Further,theuserindemnifiesTIfromall claimsarisingfromthehandlingoruse ofthegoods.Due totheopen constructionoftheproduct,itistheuser’s responsibilityto takeany and allappropriateprecautionswithregardtoelectrostaticdischarge. EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. TIcurrentlydealswitha varietyofcustomersforproducts,and thereforeourarrangementwiththeuserisnot exclusive. TIassumes no liabilityforapplicationsassistance,customer productdesign,softwareperformance,or infringementof patentsor servicesdescribedherein. PleasereadtheUser’s Guide and,specifically,theWarningsand RestrictionsnoticeintheUser’s Guide priortohandlingthe product.Thisnoticecontainsimportantsafetyinformationabouttemperaturesand voltages.Foradditionalinformationon TI’s environmentaland/orsafetyprograms,pleasecontacttheTIapplicationengineerorvisitwww.ti.com/esh. No licenseisgrantedunderany patentrightorotherintellectualpropertyrightofTIcoveringorrelatingtoany machine,process,or combinationinwhichsuch TIproductsorservicesmightbe orareused. FCC Warning Thisevaluationboard/kitisintendedforuse forENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and isnotconsideredby TItobe a finishedend-productfitforgeneralconsumer use.Itgenerates,uses,and can radiateradiofrequencyenergyand has notbeen testedforcompliancewiththelimitsofcomputingdevicespursuanttopart15 ofFCC rules,whicharedesignedtoprovidereasonableprotectionagainstradiofrequencyinterference.Operationofthis equipmentinotherenvironmentsmay cause interferencewithradiocommunications,inwhichcase theuserathisown expense willbe requiredtotakewhatevermeasures may be requiredtocorrectthisinterference. EVM Warnings and Restrictions ItisimportanttooperatethisEVM withintheinputvoltagerangeof–0.3V to6 V and theoutputvoltagerangeof–0.3V toVDD +0.3V . Exceedingthespecifiedinputrangemay cause unexpectedoperationand/orirreversibledamage totheEVM. Ifthereare questionsconcerningtheinputrange,pleasecontacta TIfieldrepresentativepriortoconnectingtheinputpower. Applyingloadsoutsideofthespecifiedoutputrangemay resultinunintendedoperationand/orpossiblepermanentdamage tothe EVM. PleaseconsulttheEVM User's Guide priortoconnectingany loadtotheEVM output.Ifthereisuncertaintyas totheload specification,pleasecontacta TIfieldrepresentative. Duringnormaloperation,some circuitcomponents may have case temperaturesgreaterthan85°C. The EVM isdesignedto operateproperlywithcertaincomponents above 85°C as longas theinputand outputrangesaremaintained.These components includebutarenotlimitedtolinearregulators,switchingtransistors,pass transistors,and currentsense resistors.These typesof devicescan be identifiedusingtheEVM schematiclocatedintheEVM User's Guide.When placingmeasurement probesnear thesedevicesduringoperation,pleasebe aware thatthesedevicesmay be verywarm tothetouch. MailingAddress:Texas Instruments,PostOfficeBox 655303,Dallas,Texas 75265 Copyright© 2011,Texas InstrumentsIncorporated

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