epcos serial capacitors mlsc 的介绍

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1、MLSCMultiLayerSerialCeramicCapacitorMLSC:WhyMLSC?SENSITIVE;riskoffracturedMLCCCRITICALincaseoffracturedMLCCSTANDARDAutomotiveCriticalAreasonthePCB:Applicationsdirectlylinkedtoapowersource/voltagesource(e.g.battery,clamp15or30inacar)without(integrated)current

2、limitation.Problem:Riskofcracksduringtheproductionandmountingprocess->canresultinshortsandlocaloverheatingincaseofunlimitedcurrent.MLSCofEPCOS:TheserialdesignlimitstherisksoffailuresandbringsimprovedreliabilitytotheapplicationMLSC:StressonCeramicCapacitorsStr

3、essontheceramiccapacitorcanbeclassifiedintomechanicalstress(assemblingcracklightblueandyellow,bendingcrackblackanddarkblue)thermalstress(soldershockcrackred)electricalstressIncaseofsuchacrackatastandardMLCCthecrackrunsthroughtheactivearea,hitstwo(ormore)elect

4、rodeswithoppositepolarityandcauseashortcircuit.Incaseofashortcircuitthecurrentcouldflowdirectlyfromthepowersource/voltagesourcethroughtheMLCCtotheconsumerloadnearlywithoutanylimitation.IstheMLSCcrackedinthiswaynoshortcircuitcanoccur,asthereisnolinechannelbetw

5、eenthecapacitor‘spluspoleandminuspoleduetothespecialinnerelectrodedesign(seriesconnectioninonecomponent).TheMLSCreducestheprobabilityofashortcircuitincaseofthementionedcracksofaboutfactor100to500.activeareaMLSC:Requirementsforclamp30applicationsCarmanufacture

6、rs‘requirementsforclamp30applicationsMostcarmanufacturersrequirea(redundant)serialconnectionoftwoMLCCs,ifthePCB/applicationisdirectlylinkedtothebattery.IncaseofashortcuttedMLCC(whichisdirectlylinkedtothebattery)thesecondMLCCpreventsthecurrenttoflowdirectlytot

7、heconsumerload.ThespecialMLSCdesignrepresentstwocapacitorsserialconnectedinoneelementandfulfillstherequirementsofthecarmanufacturersforclamp30applicationsinonecapacitor.Redundantsystemswithtwoorfoursingleelementsarenotnecessaryanymore.Thusthereliabilityforthe

8、wholeapplicationcanbeincreased,placesavingeffectsandreducedassemblingtimeduetolessnumberofcomponents.redundantsystemconsistingoftwosingleceramiccapacitorsoneMLSC(C1andC2inonecomponent)MLS