Transcription of Analysis and Design of Input Filter for DC-DC Circuit
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Analysis and Design of Input Filter for DC-DC Circuit
1 SNVA801 November2017 SubmitDocumentationFeedbackCopyright 2017,TexasInstrumentsIncorporatedAnalysi sand Designof InputFilterfor DC-DCCircuitApplicationReportSNVA801 November2017 Analysisand Designof InputFilterfor DC-DCCircuitCharlesZhangABSTRACTW hendesigningDC-DCcircuits,it is commonto add the inputfilter circuitbeforethe LCfilter is one of mostfrequentlyusedinputfilter ,if a designis not optimal,inputfilter circuitmaycauselargeoutputnoiseinsteadof suppressingthe noise,and influenceof the inputfilteron the DC-DCcontrollooptransferfunction,and the influenceof a closedloopon the inputfilter,explainswhy inputfiltercausesunexpectedproblem,and suggestshow to eliminatethe side effectof the BuckWithInputLC the the InputImpedanceon trademarksare the propertyof + GNDAPCinUinILIOIOU loadRCRCLLR+ GNDAPC+ inU inI LI OI OU LI d inU d 1 : DloadRCRCLLR inLLCP ininiI dDiuU dDuFunctionof November2017 SubmitDocumentationFeedbackCopyright 2017,TexasInstrumentsIncorporatedAnalysi sand Designof InputFilterfor DC-DCCircuit1 Functionof InputFilterCircuitInputfiltersare widelyusedin mainpurposes:one is to suppressthe noiseand surgefromthe frontstagepowersupply,anotheris to decreasethe interferencesignalat switchingfreq
DC-DC back to the power bus. Thus, a LC filter is often used for DC-DC circuit to pass EMI test. When adopting LC filter to solve an EMI problem, another problem may arise, when the load transient performance changes, audio stability becomes worse at some frequency, some even cause the stability problem.
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