Transcription of How to Measure the Loop Transfer Function of …
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How to Measure the Loop Transfer Function of …
ApplicationReportSNVA364A October2008 bodeplotwithonlyanaudiogenerator(orsimpl esignalgenerator) explainedinaneasytofollowstep-by-stepman nersothata powersupplydesignercanstartperformingthe semeasurementsin a :Analyzinga Caseswitha TypicalBodePlotofa October2008 RevisedApril2013AN-1889 HowtoMeasuretheLoopTransferFunctionofPow erSuppliesSubmitDocumentationFeedbackCop yright 2008 2013, a Bodeplotis ideallymeasuredwitha networkanalyzerbutcanalsobeobtainedwithv erysimpleequipmentavailablein :SettinguptheCircuitThefirststepis tobreaktheloopofthepowersupplyin ordertohavea pointtoinjecta ,theloopisbrokenatthelowimpedanceoutputn odeabovethehighsidefeedbackresistorin goodinjectionpoint, showsa ,A andB,a smallresistanceshouldbeputin goodvalueis a 20 resistortheadjustedoutputvoltagewillbene gligiblyinfluencedbutthenodestoinjecta parallelwiththeR1feedbackresistorshoulds tayinparallelwithR1andnotbemodifiedbythe introductionofthe20 soundmechanicalmeasurementstructureis shownin Figure2.
Introduction www.ti.com 1 Introduction The regulation characteristics of most power management circuits are defined by the converter loop transfer function which can be plotted in a Bode plot.
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