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ADA4091-2ARZ_adi芯片公司本文导读:Eff,isdefinedasAttheonsetofclip,Eff=25%fortheClassAamplifier,78.5%fortheClassBamplifier,and90%fortheClassDamplifier(seeFigure.Thesebest-casevaluesforClassAandClassBaretheonesoftencitedintextbooks.FigurePowerefficiencyofClassA。
0002SSN
0002SSN
08G5158
1032AR
16246844
16258255
16258256
ADA4091-2ARZ_adi芯片公司butthereareimportantchallengesforthedesigner.Theseinclude:ChoiceofoutputtransistorsizeOutput-stageprotectionSoundqualityModulationtechniqueEMILCfilterdesignSystemcostChoiceofOutputTransistorSizeTheoutputtransistorsizeischosentooptimizepowerdissipationoverawiderangeofsignalconditions.EnsuringthatVDSstayssmallwhenconductinglargeIDSrequirestheonresistance(RON)oftheoutputtransistorstobesmall(typically0.1ohmto0.2ohm).Butthisrequireslargetransistorswithsignificantgatecapacitance(CG).Thegate-drivecircuitrythatswitchesthecapacitanceconsumespower—CV2f。
1826-1048(OP070366Z)*
1B21AN
1B51AN
22050N
22057R
221R950
26TL
2904H6IC
2B54A
2B54BB
32F9729
32F9729
38MI
ADA4091-2ARZ_adi芯片公司though.ClassDAmplifierTerminology,andDifferentialvs.Single-EndedVersionsFigure3showsadifferentialimplementationoftheoutputtransistorsandLCfilterinaClassDamplifier.ThisH-bridgehastwohalf-bridgeswitchingcircuitsthatsupplypulsesofopitepolaritytothefilter。
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