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Thisarticlewillintroduceyoufoursimple,usefulamplifiercircuitsofTDA2003.TDA2003isaSTMicroelectronicsaudioamplifierICwithamaximumoutputpowerof10W,commonlyusedinstereoamplificationincarRadio.TheICcanoutputamaximumcurrentof3.5Aandhasverylowharmonicandcrossoverdistortion.Forfurther,detailedintroductiontoTDA2003pleaseclickheretoview:TDA2003CatalogI.TDA2003IntegratedOTLPowerAmplifierCircuit1.1ComponentRequired1.2CircuitIntroduction1.3CircuitInstallationPrecautionsII.TDA2003PowerAmplifierCircuit②2.1CircuitIntroduction2.2CircuitCharateristics2.3CircuitInstallationPrecautionsIII.TDA2003PowerAmplifierCircuit③IV.TDA2003Based10WAudioPowerAmplifierCircuitI.TDA2003IntegratedOTLPowerAmplifierCircuit1.1ComponentRequiredIntegratedblockTDA2003:1Resistorsof1,2.2,39,220:1ofeach03F,0.03F,100F,470F,1000Fcapacitors:1ofeach1Fcapacitor:2pcsSpeaker8,0.25W:14Vpowersupply:11.2CircuitIntroductionThecircuitusestheTDA2003integratedblock,whichisasimplecircuitwithawidepassbandandbeautifulsoundquality,andcanbewidelyusedinvariousaudioandvoiceamplificationcircuits.TDA2003IntegratedOTLPowerAmplifierCircuitPin①oftheintegratedblockistheinput,pin②isconnectedtoexternalcapacitorC2andexternalresistorR3,togethertheyconstituteanACnegativefeedback,toimprovethesoundqualityoftheamplifier.C3,R1istheanti-self-excitationnetwork,C4istheoutputcouplingcapacitor,C6,C7isthepowersupplyhighandlowpassfiltercapacitor,thesupplyvoltageVCCis14.4V,thequiescentcurrentis45mA,theresistanceoftheloadRLis4,andthepoweris6W.1.3CircuitInstallationPrecautions1.TheorderofthepinsofTDA2003mustbejudgedcorrectly,andsolderingerrorsarenotallowed.WhensolderingelectrolyticcapacitorsC1,C2,C4,C6,besuretonotethatthepositiveandnegativepolaritiesofthecapacitorscannotbereversed.2.ThevoltageofthepowersupplyVCCcannotbetoohighortoolow,itisappropriatetobeabout14.4V.3.Afterthesolderingiscompleted,youcanusetheaudiooutputjackoftheradioorrecordertoconnecttheearphonetotheinputpin1inthepicture.4.HeatsinksshouldbeinstalledontheintegratedblockTDA2003topreventdamageduetolongworkinghours.II.TDA2003PowerAmplifierCircuit②2.1CircuitIntroductionTDA2030adoptsV-shaped5-pinsinglein-lineplasticpackagestructure.ThefollowingfigureisanotherclassicpoweramplifierapplicationcircuitdiagramofTDA2003.Thisintegratedcircuitiswidelyusedincarstereoradiorecordersandmediumpoweraudioequipment.Ithasthecharacteristicsofsmallsize,largeoutputpower,andlowdistortion,andithasaninternalprotectioncircuit.ItalySGScompany,AmericanRCAcompany,JapanHitachicompany,NECcompany,etc.allhavesimilarproductsproduced.Althoughtheirinternalcircuitsareslightlydifferent,thepositionsandfunctionsoftheleadpinsarethesame.TDA2003PowerAmplifierCircuit22.2CircuitCharateristicsVeryfewexternalcomponentsLargeoutputpower,Po=18W(RL=4)Theuseofultra-smallpackage(TO-220)canincreasetheassemblydensity.Minimalbootimpact.Itcontainsvariousprotectioncircuits,soitissafeandreliabletowork.Themainprotectioncircuitsare:short-circuitprotection,thermalprotection,accidentalopencircuitofthegroundwire,reverseconnectionofpowersupplypolarity(Vsmax=12V),andloaddischargevoltagekickback.TDA2030Acanoutput16Weffectivepowerwhenworkingat19Vand8impedanceataminimumvoltageof6Vandamaximumof22V,THD0.1%.Undoubtedly,itisverysuitableforthepoweramplificationpartofcomputeractivespeakersorsmallpoweramplifier.2.3CircuitInstallationPrecautions1.TDA2030hasaloaddischargevoltagekickbackprotectioncircuit.Ifthepeakvoltageofthepowersupplyvoltageis40V,thenanLCfiltermustbeinsertedbetweenpin5andthepowersupplytoensurethatthepulsetrainonpin5remainswithinthespecifiedrange.2.Thermalprotection:Thermallimitprotectionhasthefollowingadvantages,itcaneasilywithstandoutputoverload(evenforalongtime),orprotectitwhentheambienttemperatureexceeds.3.Comparedwithordinarycircuits,theheatsinkcanhaveasmallersafetyfactor.Ifthejunctiontemperatureexceeds,itwillnotdamagethedevice.Ifthishappens,Po=(andPtotofcourse)andIowillbereduced.4.Thedecouplingofthegroundwireandtheoutputmustbeconsideredinthedesignoftheprintedcircuitboard,becausethesecircuitshavelargecurrents.5.Theheatsinkdoesnotneedtobeinsulatedduringassembly,theleadlengthshouldbeasshortaspossible,andthesolderingtemperatureshouldnotexceed260Cfor12seconds.6.AlthoughTDA2030requiresfewcomponents,theselectedcomponentsmustbequality-guaranteedcomponents.III.TDA2003PowerAmplifierCircuit③TDA2003PowerAmplifierCircuit3Inthiscircuit,pin1isthesignalinputandsignalflow;thesignaliscoupledtothetda2003-1pinviaa4.7microfaradcapacitor,avolumeadjustmentpotentiometeranda47microfaradcapacitor,the2pinisanRCnetwork,the3pinisgrounded,andthe4pinhasfouroutputs.Thetwocomponentsconnectedinparallelwiththespeakerareanti-self-excitation.Pin5ispowersupply.Twocapacitorsfilterhighfrequenciesandfilterlowfrequencies.220ohmsfor2feetand4feetisnegativefeedback,47ohmsdividedby220ohmsisthemagnification.IV.TDA2003Based10WAudioPowerAmplifierCircuitTDA2003Based10WAudioPowerAmplifierCircuitThisamplifyingcircuitcanapproximate10wattsofpowerto2ohmsand4ohmsto4watts.Themaximumpowercanbeobtainedwitha16VDCpowersupplyanda2ohmimpedancespeakerwithacurrentofmorethan1A.Apowerofmorethan4wattscanobtaina12voltDCpowersupplyandacurrentofmorethan14ohmimpedance.

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