高效率D类音频放大器延长便携式应用的电池寿命
摘要:本应用笔记探讨D类(开关模式和滤波器)音频放大器的运作和效益。如MAX4295单声道和立体声滤波器MAX9701与提高工作效率提供高品质的音频相比,传统的线性音频放大器(A类,B类,AB类)时,开关模式放大器。本应用笔记介绍了传统的线性音频放大器设计概述,然后比较他们与D类放大器设计。新的G类放大器的优点是公认的。文章显示效率的计算和D类放大器的输出滤波器的设计。D类放大器的高效率表现与MAX9701。Maxim>AppNotes>AmplifierandComparatorCircuitsAudioCircuitsKeywords:audioamplifier,speakerdriver,BTL,bridge-tiedload,switchingaudio,ClassD,PWM,switch-mode,H-bridge,efficiencySep20,2010APPLICATIONNOTE1760High-EfficiencyClassDAudioAmplifiersExtendBatteryLifeinPortableApplicationsAbstract:ThisapplicationnoteexaminestheoperationandbenefitsofaClassD(switch-modeandfilterless)audioamplifier.Switch-modeamplifierssuchasthemonoMAX4295andstereofilterlessMAX9701offerhighqualityaudiowithimprovedefficiencywhencomparedtotraditionallinearaudioamplifiers(ClassA,ClassB,andClassAB).ThisapplicationnotepresentsanoverviewoftraditionallinearaudioamplifierdesignsandthencomparesthemwithClassDampli