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1、PreparedBy:Ivan.Zhang3GProductsC33,C34BurntIssue3G產(chǎn)品C33,C34炸機(jī)問題Index索引Failurehistory失效歷史Problemdescription問題描述Failureanalysis失效分析Designexperiment設(shè)計(jì)實(shí)驗(yàn)ConclusionandCA結(jié)論和改善措施ProblemDescription問題描述Background背景TheC33andC34failureratesuddenlytoriseinJan.2009andcausedtheproductionlinetoshutdown.MRBmeeti
2、ngheldtodiscusstheshorttermandlongtermcorrectiveactionandplantwithstoodbigshippingpressureaccordingly.2009年11月份3G產(chǎn)品C33,C34不良率大幅上升，產(chǎn)線因此停線。工廠召開MRB會議討論對策，出貨壓力驟升。Pic.13GProductsProblemDescription問題描述Symptom癥狀ThefailedunitswiththesymptomthatC33,C34,Q10,Q11burntatfirstACstartup.TheunitscanpassallATEtes
3、titemafterreplacingtheC33,C34,Q10,Q11.不良機(jī)器在Runup第一個(gè)測試項(xiàng)目---ACstartUP項(xiàng)起機(jī)瞬間便炸C33,C34,Q10,Q11同時(shí)擊穿。更換C33,C34,Q10,Q11后機(jī)器可以通過所有ATE測試。FailureHistory失效歷史TherepairrecordshowsthefailurecantracebacktoJan.2009,itmeanssuchfailureexistedfromthebeginningof3GproductsbuildinSTJplant.Thefailurerateisabout974ppm.維修記
4、錄顯示失效狀況可以追溯到2009年1月，也就說這種失效從3G產(chǎn)品在STJ工廠生產(chǎn)就存在著。失效率大約為974ppm。.CauseAndEffectDiagram特性要因圖C33,C34burntMechanicalDamageComponentSMTProcessDesign/ApplicationTestProcessOthersPossibleCauseDescriptionandhintsDesign/ApplicationSuspectthereisdesignmarginalorapplicationissueonthePSU.ComponentSuspectcomponent
5、swithsomethingwrongSMTProcessNoabnormalitywasfoundonSMT.MechanicalDamageSuspectmechanicaldamage.TestProcessNoabnormitywasfound.OthersNoabnormitywasfound.ApplicationAnalysis應(yīng)用分析Circuitanalysis電路分析Sch.1RelatedschematicdiagramApplicationAnalysis應(yīng)用分析Waveform.1ACline:186V,loading:0AWaveform.4ACline:23
6、0V,loading:33AWaveform.3ACline:230V,loading:0AWaveform.2ACline:186V,loading:33AApplicationAnalysis應(yīng)用分析Waveform.5ACline:264V,loading:0AWaveform.6ACline:264V,loading:33AWaveformdescription:CH1:C33Voltage;CH2:C34Voltage.C33,C34workasthesnubbercapacitorofQ10andQ11,inthishalf-bridgetopology,theC33andC
7、34arechargedjustwhentheAClineturnedon,whentheQ10ison,theQ11isoff,theC33dischargesatthesametime;SoandC34,Q11.ApplicationAnalysis應(yīng)用分析以上波形中，CH1:C33電壓波形;CH2：C34電壓波形。C33,C34作為緩沖電容保護(hù)Q10,Q11，在此半橋拓?fù)渲?，我們從上面的波形可以看到，加市電瞬間，C33,C34
