tda7492

September2011DocID14926Rev51/321TDA749250W+50WdualBTLclass-DaudioamplifierFeatures■50W+50WcontinuousoutputpoweratTHD=10%withRL=6ΩandVCC=25V■40W+40WcontinuousoutputpoweratTHD=10%withRL=8ΩandVCC=25V■Wide-rangesingle-supplyoperation(8-26V)■Highefficiency(η=90%)■Fourselectable,fixedgainsettingsofnominally21.6dB,27.6dB,31.1dBand33.6dB■Differentialinputsminimizecommon-modenoise■Standbyandmutefeatures■Short-circuitprotection■Thermaloverloadprotection■Externallysynchronizable■ECOPACK®,environmentally-friendlypackageDescriptionTheTDA7492isadualBTLclass-DaudioamplifierwithsinglepowersupplydesignedforLCDTVsandmonitors.Thankstothehighefficiencyandexposed-pad-up(EPU)packageonlyasimpleheatsinkisrequired.PowerSSO-36withexposedpadupTable1.DevicesummaryOrdercodeOperatingtemp.rangePackagePackagingTDA74920to70°CPowerSSO-36EPUTubeTDA749213TR0to70°CPowerSSO-36EPUTapeandreelΩloads................................114.2Characterizationsfor8-Ωloads................................154.3Characterizationsfor4-Ωloads................................184.4Testboard.................................................215Applicationscircuit.........................................226Applicationsinformation....................................236.1Modeselection.............................................236.2Gainsetting...............................................246.3Inputresistanceandcapacitance...............................246.4Internalandexternalclocks...................................256.4.1Mastermode(internalclock).................................256.4.2Slavemode(externalclock)..................................256.5Outputlow-passfilter........................................266.6Protectionfunctions.........................................276.7Diagnosticoutput...........................................276.8Heatsinkrequirements.......................................287Packagemechanicaldata...................................29TDA7492ContentsDocID14926Rev53/328Revisionhistory...........................................31ListoftablesTDA74924/32DocID14926Rev5ListoftablesTable1.Devicesummary..........................................................1Table2.Pindescriptionlist.........................................................8Table3.Absolutemaximumratings..................................................9Table4.Thermaldata.............................................................9Table5.Electricalspecifications.....................................................9Table6.Modesettings...........................................................23Table7.Gainsettings............................................................24Table8.HowtosetupSYNCLK...................................................25Table9.PowerSSO-36EPUdimensions.............................................30Table10.Documentrevisionhistory.................................................31TDA7492ListoffiguresDocID14926Rev55/32ListoffiguresFigure1.Internalblockdiagram(showingonechannelonly)...............................6Figure2.Pinconnections(topview,PCBview).........................................7Figure3.Outputpowervs.supplyvoltage............................................11Figure4.THDvs.outputpower(1kHz)..............................................12Figure5.THDvs.outputpower(100Hz).............................................12Figure6.THDvs.frequency.......................................................13Figure7.Frequencyresponse.....................................................13Figure8.Crosstalk..............................................................13Figure9.FFTperformance(0dB)..................................................14Figure10.FFTperformance(-60dB).................................................14Figure11.Outputpowervs.supplyvoltage............................................15Figure12.THDvs.outputpower(1kHz)..............................................15Figure13.THDvs.output(100Hz)..................................................16Figure14.THDvs.frequency.......................................................16Figure15.Frequencyresponse.....................................................16Figure16.Crosstalk..............................................................17Figure17.FFTperformance(0dB)...................................................17Figure18.FFTperformance(-60dB).................................