7368音频功放.pdf

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1、TA7368PG/FGTOSHIBABipolarLinearIntegratedCircuitSiliconMonolithicTA7368PG,TA7368FGAudioPowerAmplifierTA7368PGTheTA7368PGandTA7368FGaresuitablefortheaudiopoweramplifierofportablecassettetaperecorderandradio.Features•Veryfewexternalparts(onlythreecapacitors)•Lowquiescentcurren

2、t:ICCQ=6.6mA(typ.)(VCC=6V)•OutputpowerTA7368FGTA7368PG:Pout=720mW(typ.)(VCC=6V,RL=4Ω,THD=10%)TA7368PG/FG:Pout=450mW(typ.)(VCC=6V,RL=8Ω,THD=10%)•Voltagegain:GV=40dB(typ.)•Operatingsupplyvoltagerange:VCC=2~10V(Ta=25°C)WeightSIP9−P−2.54A:0.92g(typ.)SSOP10−P−225−1.00:0.09g(typ.)

3、BlockDiagramVCCRIPPLE+2/59/2RIPPLEFILTERVin1/4+−7/10Pout+−RL3/64/75/86/9NFPHASEPRE-GNDPW-GND+/:TA7368PG/TA7368FG12006-04-28TA7368PG/FGPrecautionForUseAndApplication1.Inputstage/:TA7368PG/TA7368FGTheinputstageofpoweramplifier(equivalentcircuit)iscomprisedofaPNPdifferentialpai

4、r(Q2andQ3)precededbyaPNPemitterfollower9/2(Q1)whichallowsDCreferencingofthesourcesignaltoground.Thiseliminatedtheneedforaninputcouplingcapacitor.However,incasethebrushnoiseofvolumebecomesaproblem,provideseriallyacouplingFROMPIN7/10Q2Q3capacitortotheinputside.R54R2.Adjustment

5、ofvoltagegain1/4Q1Q4ThevoltagegainisfixedatGV≒40dBbytheresistors(R4andR5)inIC,1ΩRhowever,itsreductionispossiblethroughaddingRfasshowninFigure2.27kD15/83/6Inthiscase,thevoltagegainisobtainedbythefollowingequation.Fig.1R5+R4+RfGV=20logR4+RfIN1/4ItisrecommendedtousethisICwithth

6、evoltagegainofGV=28dBorVinNFover.RfR4+3/6−R53.Ripplerejectionratio+90ΩAddingCRIP,torippleterminal2asshowninFigure3,theripple10Ωrejectionratioisimprovedfrom−25dΒtyp.to−45dΒtyp.Fig.2RIPPLE4.PowerdissipationCareshouldbetakentousethisICbelowmaximumpowerdissipation.2/5Becauseitma

7、yoverabsolutemaximumratingdependingonoperatingCRIP+condition.•TA7368PGPD=900mW(Ta=25°C)Fig.3•TA7368FGPD=400mW(Ta=25°C)5.Phase−compensationSmalltemperaturecoefficientandexcellentfrequencycharacteristicisneededbycapacitorsbelow.•Oscillationpreventingcapacitorsforpoweramplifier

8、output•Bypasscapacitorforripplefilter•CapacitorbetweenVCCandGND22006-04-28T