slva059a-Buck Boost

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1、ApplicationReportSLVA059A-March1999−RevisedNovember2002UnderstandingBuck-BoostPowerStagesinSwitchModePowerSuppliesEverettRogersSystemPowerABSTRACTAswitchingpowersupplyconsistsofthepowerstageandthecontrolcircuit.Thepowerstageperformsthebasicpowerconversionfromtheinputvoltageto

2、theoutputvoltageandincludesswitchesandtheoutputfilter.Thisreportaddressesthebuck-boostpowerstageonlyanddoesnotcovercontrolcircuits.Detailedsteady-stateandsmall-signalanalysisofthebuck-boostpowerstageoperatingincontinuousanddiscontinuousmodeispresented.Variationsinthestandardb

3、uck-boostpowerstageandadiscussionofpowerstagecomponentrequirementsareincluded.Contents1Introduction...................................................................................22Buck-BoostStageSteady-StateAnalysis........................................................3

4、2.1Buck-BoostSteady-StateContinuousConductionModeAnalysis...............................32.2Buck-BoostSteady-StateDiscontinuousConductionModeAnalysis.............................72.3CriticalInductance.......................................................................113Bu

5、ck-BoostPowerStageSmallSignalModeling................................................123.1Buck-BoostContinuousConductionModeSmall-SignalAnalysis..............................133.2Buck-BoostDiscontinuousConductionModeSmall-SignalAnalysis............................164Variation

6、softheBuck-BoostPowerStage......................................................214.1FlybackPowerStage.....................................................................215ComponentSelection.........................................................................245.1Output

7、Capacitance......................................................................245.2OutputInductance.......................................................................265.3PowerSwitch...........................................................................275.4OutputD

8、iode................................................................