Transcription of SLVA390– February 2010 Calculating Efficiency
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ApplicationReportSLVA390 February2010 CalculatingEfficiencySubmitDocumentation FeedbackCopyright 2010 ,TexasInstrumentsIncorporated2LR M S_LD CRP = IR 222 RMS_L OII= I +12 DRMS_LOI= largeportfolioofDC-DCconverterswhichoper ateovera , , quickandeasymethodtoobtainthepowersupply ' a DC-DCconverterare: Inductorconductionlosses MOSFET conductionlosses showsthecurrentthroughtheinductorin a givenby:(1)WhereRDCRis givenby:(2)Where I = ripplecurrentTypically I is about30% ,theinductorcurrentcanbecalculatedtobe:( 3)2 CalculatingEfficiencySLVA390 February2010 SubmitDocumentationFeedbackCopyright 2010 ,TexasInstrumentsIncorporated2 LODCRP = IR 2Q1 RMS_Q1 DSON1P = IR 22OQ1 ODSON1 INVIP =I +RV12 D 2Q2 RMS_Q2 DSON2P= IR , it :(4)3 PowerDissipatedintheMOSFETsFigure3 showsthecurrentthroughthehigh- thehigh-sideMOSFETis givenby:(5)WhereRDSON1is :(6)Figure4 showsthecurrentthroughthelow- thelow-sideMOSFETis givenby:(7)WhereRDSON2is :3 SLVA390 February2010 CalculatingEfficiencySubmitDocu
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