Transcription of LC Filter Design (Rev. A) - Texas Instruments
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LC Filter Design (Rev. A) - Texas Instruments
1 SLAA701A October2016 RevisedNovember2016 SubmitDocumentationFeedbackCopyright 2016,TexasInstrumentsIncorporatedLC FilterDesignAll trademarksare the propertyof October2016 RevisedNovember2016LC FilterDesignABSTRACTIn higher-powerclass-Damplifiers,generallya bove10 W of outputpower,a filteron the outputof theamplifieris filteris passivein natureand usesbothan inductorand a capacitoron ,it is referredto as an LC the LC filteriscriticalto meetthe desiredaudioperformance,efficiency,EMC/E MIrequirements,and costfor the a guideto aid in the sectionof LC filtercomponentsforclass-Damplifiersto meettarget-designgoalsof the end (BTL).. (PBTL).. (SE).. (Traditional) OutputLC AD ModulationWithType-1or Resistance(DCR).. of Figures1 Stereo(Two-Channel)BTL (Traditional) October2016 RevisedNovember2016 SubmitDocumentationFeedbackCopyright 2016,TexasInstrumentsIncorporatedLC FilterDesign6 Effectof Q on AD FilterResponseWithCBTL= F and LBTL= 10 BD or AD FilterResponseWithCg= F and LBTL= 10 AD FilterResponseWithCBTL= F, Cg= F, and LBTL= 10 ModulationFilterConvertedto +Nvs OutputPower,4.
allow for four channels with a single stereo BTL amplifier as shown in Figure 3. Some amplifiers also allow a combination of 1× BTL and 2× SE channels for support of 2.1 audio systems with a single device. Due to the PWM modulation of a class-D amplifier, a DC voltage of PVDD / 2 or half of the supply voltage is present after the LC filter.
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