Class D Audio Amplifier Basics.pdf

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1、ApplicationNoteAN-1071ClassDAudioAmplifierBasicsByJunHonda&JonathanAdamsTableofContentsPageWhatisaClassDAudioAmplifier?–TheoryofOperation..................2TopologyComparison–Linearvs.ClassD.........................................4AnalogytoaSynchronousBuckCon

2、verter..........................................5PowerLossesintheMOSFETs...........................................................6HalfBridgevs.FullBridge....................................................................7MajorCauseofImperfection............

3、....................................................8THDandDeadTime............................................................................9AudioPerformanceMeasurement........................................................10ShootThroughandDeadTime........

4、....................................................11PowerSupplyPumping........................................................................12EMIConsideration:QrrinBodyDiode.................................................13Conclusion......................

5、.....................................................................14AClassDaudioamplifierisbasicallyaswitchingamplifierorPWMamplifier.Thereareanumberofdifferentclassesofamplifiers.Thisapplicationnotetakesalookatthedefinitionsforthemainclassifications.www.ir

6、f.comAN-10711AN-1071WhatisaClassDAudioAmplifier-non-linearityofClassBdesignsisovercome,TheoryofOperationwithouttheinefficienciesofaClassAdesign.EfficienciesforClassABamplifiersisaboutAClassDaudioamplifierisbasicallyaswitch-50%.ingamplifierorPWMamplifier.Therea

7、reanum-berofdifferentclassesofamplifiers.WewilltakeClassD–Thisclassofamplifierisaswitchingalookatthedefinitionsforthemainclassifica-orPWMamplifierasmentionedabove.Thistionsasanintroduction:classofamplifieristhemainfocusofthisappli-cationnote.Inthistypeofamplif

8、ier,theswitchesClassA–InaClassAamplifier,theoutputde-areeitherfullyonorfullyoff,significantlyre-vicesarecontinuouslyconductingfortheentireducingthepowerlossesintheoutputdevices.cyc