分立LED的MTBF计算方法

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[quote]

MTBFFORDISCRETELEDSANDPHOTODIODES
ThecalculationofMeanTimeBetweenFailure(MTBF)isoftenrequiredasanaidinpredictingthereliabilityofelectronicequipmentunderdifferentoperatingconditions.ThevalueofMTBFforacomponentisbaseduponfailure-ratemodelswhichhavebeendevelopedinconjunctionwithMIL-HDBK-217E.TheMTBFisnotaguaranteeofuseableproductlifetime,butisaguideforplanningtheoperationaluseoftheequipment.Theaccuracyofthevaluescalculatedisdependentuponthevalidityofthemodels.Also,thevalueschosenfortheoperatingparametersmustberepresentativeoftheoperatingparametersduringactualuse.Inthecaseoffiberopticdatacommunicationequipment,anareaofprimaryconcernistheMTBFvaluesforthediscreteLightEmittingDiodes(LEDs)andphotodiodesusedinthefiberoptictransmittersandreceivers.

ThedeterminationofthepredictedMTBFforanLEDorphotodiodeisacalculationusingthepartfailure-ratemodelforoptoelectronicdevicesasfoundinsection5.1.3.10ofMIL-HDBK-217E.Thepartfailure-ratemodel,lP,isasfollows:where:ThevalueforMTBFisthendeterminedfrom:Threeoftheabovementionedfactorsareexplicitlydefinedinsection5.1.3.10ofMIL-HDBK-217E(lB,IIE,andIIQ).Valuesforthesefactors,alongwithdescriptionsofthevariousconditionsidentifiedbyMIL-HDBK-217Earediscussedinthisnote.Thefourthparameter,IIT,maybeobtainedeitherfromtablesprovidedinMIL-HDBK-217Eorfromcalculationsinvolvingparametricdataobtainedfromthedeviceduringactualorsimulatedoperation.IdentificationoftheseparametersandspecificdataapplicabletocomponentsmanufacturedbyHoneywellarealsocontainedinthisapplicationnote.

ThereareseveralsamplecalculationstoaidtheuserindeterminingMTBFvaluesfortheparticularcomponentswhichheisconsidering.Inaddition,thereareanumberoftablesincludedinwhichMTBFvaluesarelistedforvarioustypesofdevicesunderdifferentoperatingconditions.BASEFAILURERATEThedevicebasefailure-rate,lB,isgiveninTable5.1.3.10-3ofMIL-HDBK-217E.ThevaluesforLEDandphotodiodesareshownbelow.BaseFailure-Rate(fromMIL-HDBK-217E,Table5.1.3.10-3)QUALITYFACTORThequalityfactorisgiveninTable5.1.3.10-4ofMIL-HDBK-217E.Thisisreproducedbelowalongwithabriefdescriptionofthevariousqualitylevels.QualityFactors(fromMIL-HDBK-217E,Table5.1.3.10-4)QualityLevelIIQDescriptionJANTXV0.001FulltestingasdefinedbyMIL-S-19500includingScreeningandGroupsA,B,andC.JANTX0.02IdenticaltoJANTXVexceptdoesnotincludethe100%precapvisualinspectioncontainedinScreening.JAN0.1TestingasdefinedbyMIL-S-19500includingGroupsA,B,andC,butnotincludingScreening.LOWER0.5AppliestoallhermeticpackagedLEDsandphotodiodes.PLASTIC1.0Appliestoalldevicesencapsulatedwithorganicmaterials.Productsmeetinganyofthequalitylevelsdefinedinthequalityfactorstable(MIL-HDBK-217E,Table5.1.3.10-4)areavailablefromHoneywell.WhilethereareveryfewfiberoptictypeproductsdefinedbyaslashsheettoMIL-S-19500,atestprogramcanbedesignedwhichwillcarryouttheintentionofMIL-S-19500foranyofthe”metalwindowcan”deviceswhichHoneywelloffers.ApplicationNoteCalculatingMeanTimeBetweenFailureforDiscreteLEDsandPhotodiodesP=BTEQfailures106hoursT=temperaturefactorE=environmentalfactorQ=qualityfactorB=basefailure-ratefailures106hoursMTBF=1PforasingleLED0.0011failures106hoursforaphotodiodeand0.00065failures106hoursB=B=©HoneywellEuropeS.A.Honeywellreservestherighttomakechangesinordertoimprovedesignandsupplythebestproductspossible.
[/quote]

[[i]本帖最后由paulyu于2007-9-2711:19编辑[/i]]

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17 条回复 A文章作者 M管理员
  1. wx_1585643182

    购买了付费内容

  2. wchy1201

    ,英文的啊,密密麻麻的…

  3. neroyu

    好東西, 累積知識!
    感謝!!
    😀

  4. kirk630330

    對數字真的不強,很難懂!

  5. yuaan

    这另外一个帖子发的东西和这个一样啊?

  6. raocaitang

    好东西,谢谢

  7. wanhui.827

    学习

  8. byeice

    好东西看不懂

  9. scutzhj

    下载看了一下,挺好的学习资料,非常感谢楼主

  10. deadxiaoh

    谢谢分享!!!!!!!!

  11. danlings

    我晕啊,英文的啊,密密麻麻的…

  12. liguang304

    好东西,珍藏!!!

  13. zhanghjspace

    先看看再说,呵呵

  14. aboo

    不错哦。thanks

  15. kyvenger


  16. xn_juan

    :)好的啊!
    我以后注意!

  17. paulyu

    xn_juan,發表下載的東西,盡可能的摘要一些內容出來,便于下載。

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