光耦设计裕度的计算
光耦设计裕度的计算CalculationofDesignMarginforCTRofOptocouplers.Author:KevinWildashLastupdated:01Sept1998File:ctr1.doc1.Introduction:Optocouplersareusedinswitchmodepowersupplyunits(PSU)toisolatesignalswhichcrosstheprimarytosecondaryisolationboundary.Typicalusesareinthefeedbackandshutdowncircuits.SuchcircuitsarecriticaltothecorrectoperationofthePSUandfortheprotectionofthecustomer'sequipment.Sincetheperformanceofanoptocouplerdegradeswithage,itisnotsufficienttoassumethatifaPSUisworkingtodaythatitwillthereforebeworkingcorrectlytomorrow.Acalculationofthepredictedperformanceisnecessary.Thispaperdetailsaprocedurewhichwillallowtheeng
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