Transcription of Power Loss Calculation With CSI Consideration for ...
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ApplicationReportSLPA009A June2011 RevisedJuly2011 PowerLossCalculationWithCommonSourceIndu ctanceConsiderationforSynchronousBuckCon vertersDavidJauregui,BoWang, PowerStageABSTRACTT hesynchronousbuckconverterisa widelyusedtopologyinlow-voltage, (CSI)is theinductancesharedbythemaincurrentpatha ndthegatedriverloopina (HS)FETCSI hassignificantimpactonconverterperforman ce,especiallyswitchingpowerloss:thegreat ertheHSCSI, PowerBlock, ,a complementarydesigncalculator(SLPC015) is a a June2011 RevisedJuly2011 PowerLossCalculationWithCommonSourceIndu ctanceConsiderationforSynchronousBuckCon vertersSubmitDocumentationFeedbackCopyri ght 2011,TexasInstrumentsIncorporated 2co nd(HS)ds(ON)HSRMS(HS)P= RI 2cond(L S)ds(ON)LSRMS(L S)P= RI = +++ -+- 22ripp leripplerippleripp leRMS(HS ) oneofthemostpopulartopologiesfortoday s a singleprocessorcontinuetoincrease,variou scha
To account for the effect of CSI in power loss, Equation 5 and Equation 6 need to be modified. The new calculations are analyzed in detail as follows: 1. Switching power loss in period t1 First, analyze area QGS2 in Figure 2. When the gate-sourcevoltage reaches the threshold voltage VTH,
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