标签: an-4140
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AN-4140www.fairchildsemi.comApplicationNoteAN4140TransformerDesignConsiderationforoff-lineFlybackConvertersusingFairchildPowerSwitch(FPSTM)1.IntroductionForflybackcoverters,thetransformeristhemostimportantfactorthatdeterminestheperformancesuchastheefficiency,outputregulationandEMI.Contrarytothenormaltransformer,theflybacktransformerisinherentlyaninductorthatprovidesenergystorage,couplingandisolationfortheflybackconverter.Inthegeneraltransformer,thecurrentflowsinboththeprimaryandsecondarywindingatthesametime.However,intheflybacktransformer,thecurrentflowsonlyintheprimarywindingwhiletheenergyinthecoreischargedandinthesecondarywindingwhiletheenergyinthecoreisdischarged.Usuallygapis……
