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LittelfuseOCSelectionTrainingAnthonyChang2ConfidentialandProprietarytoLittelfuse,Inc.©2006Littelfuse,Inc.Allrightsreserved.WhoWeAre...•LittelfuseInc.成立於1927年，為專業製造保險絲公司。自1999至2005年投入了過電壓保護元件製造而成為一家線路保護元件的CircuitProtectionProvider的跨國公司。總部設在美國伊利諾州DesPlaines市，擁有十幾家工廠分佈在美、歐、亞三大洲七個國家，在世界各地設有區域性營銷中心。3ConfidentialandProprietarytoLittelfuse,Inc.©2006Littelfuse,Inc.Allrightsreserved.1927—Firstinstrumentfuses1976—ATO®bladefuse1992—Surfacemount(D-Case)1994—SquareNanofuse1994—A-Case(1206)1996—0603surfacemount1997—PTCResettableDevice1999—ESDProtectors/HarrisSuppression2002LeadFree1206,0603&0402sizeFuse2002SemitronOverVoltageProducts(TVSDiodes&GDT)2003TECCOR(PowerThyristor&Sidactor)2004WickmannIntegration4ConfidentialandProprietarytoLittelfuse,Inc.©2006Littelfuse,Inc.Allrightsreserved.Fuseselection•Fusereview•Basicsoffuse•ApplicationofAspects•Selectingafuse–Fuserating–I2trating•Exampleofin-rushcurrent•Demonstrationoftriptimes•DownsidesandsolutionsOverview:5ConfidentialandProprietarytoLittelfuse,Inc.©2006Littelfuse,Inc.Allrightsreserved.Fusefunctionality-LimitedcurrentvsPotentialcurrentCircuitresponsewithoutfuseprotection–currentiseventuallydisrupted(inanunpredictablemanner)duetothefailureofacomponentorcircuitboardtraceFusedcircuit-currentisinterruptedinacontrolledmanner(bythefuse)toavoiddamagetocircuitcomponents-circuitisallowedtofail“gracefully”FuseAFuseisaTemperatureSensitiveDevicethatservesasanintentionalWeakLinkinanelectricalcircuit.Itinterruptsoverloadandshort-circuitconditionswhenitsmetallicelementmelts;therebyhaltingtheovercurrentcondition.6ConfidentialandProprietarytoLittelfuse,Inc.©2006Littelfuse,Inc.Allrightsreserved.FuseReview:ConstructionTraditionalCartridgeTypeVs.SlimlineThinFilmTypeCAPSOLDERFILAMENTBODYSOLDERCAPCartridgefuseThinFilmfuseThemetallicelement(filament)meltsanddisconnectsthepowertothecircuit.7ConfidentialandProprietarytoLittelfuse,Inc.©2006Littelfuse,Inc.Allrightsreserved.SMDFuse1.-CeramicBody.2.-FuseendcapsTin-LeadandRoHS(SilverorGold)platedcaps.3.-Filament(AgAlloy)for451&CeramicYarnandTinplatewirefor452451series452series8ConfidentialandProprietarytoLittelfuse,Inc.©2006Littelfuse,Inc.Allrightsreserved.FuseSolutionsfor:•ACmainsovercurrentprotection•Tip/RingcircuitprotectionCartridgeandleadedfuse•Industrystandardformfactors(cartridge,axialleaded,radialleaded)•DesignedtoIEC,UL,METI•Fast-acting,medium-acting,andslo-bloversionsavailable•Low,enhancedandhigh-breakingcapacityversionsavailable•Keyfeatureisthewidearrayofformfactors,amperageratings,voltageratingsandbreakingcapacitiesthatareavailable9ConfidentialandProprietarytoLittelfuse,Inc.©2006Littelfuse,Inc.Allrightsreserved.Cartridge,leadedfuse•Powersupply•Poweradaptor•TVSS•Lightingballast•Consumerelectronics–DVD,television,settopbox•Homeappliances–Washer,dryer,refrigerator,airconditioner,humidifier•Tip/ring-PowerCross(2AG)Targetapplications:AClineprotectionforpowersuppliesAClineCommon/groundPowermodulePowerplugPowersystemUltraMOV,CIII,LAseriesradialleadedMOVCartridgeorleadedfuseFusePowersupplyTip/ringcircuitPowersupply10ConfidentialandProprietarytoLittelfuse,Inc.©2006Littelfuse,Inc.Allrightsreserved.FuseSolutionsfor:•BatterypackandDCbusovercurrentprotectionSurfaceMountChipFuse•Space-efficientformfactors(0402,0603,1206)•Amperageratingsfrom0.062Ato7.0A•Lowprofileforheight-sensitiveapplications•Constructedonanepoxy-basedsubstratesimilartothecircuitboardonwhichitwillbeinstalled.Avoidstemperaturecoefficientofexpansion(TCE)mismatchthatcouldcausereliabilityproblemsinthefield.•KeyfeatureofFR-4substrateishighermeltingi2tvaluethanceramicchipfuse,whichminimizesnuisancetrippingduringin-rushcurrentevents.Lowerresistancevaluesalsominimizepowerdissipation.11ConfidentialandProprietarytoLittelfuse,Inc.©2006Littelfuse,Inc.Allrightsreserved.Solutionsfor:•ACmains/DCbusovercurrentprotection•Tip/RingcircuitprotectionSurfaceMountFuse•IncludesNano2,TeleLink®andUMFseries•RatedforACandDCcircuits•Amperageratingsfrom0.25Ato15.0A•Constructedusingceramictubebodiestoincreasebreakingcapacityandworkingvoltage•Keyfeaturesarehighermeltingi2tvaluethanchipfuse,whichminimizesnuisancetrippingduringin-rushcurrentevents;wire-in-airdesignminimizesthermalde-ratingfactorandextendsusabletemperaturerange.FuseNano2UMFfuseTeleLink®fuseNano2fuse12ConfidentialandProprietarytoLittelfuse,Inc.©2006Littelfuse,Inc.Allrightsreserved.Chipfuses•Batterypack•Harddiskdrive•Cellphone•Digitalcamera•LCDmonitorinverter(smallpanels)•MP3/PMPplayer•BluetoothheadsetWire-in-AirSMDfuses•Motherboards(servers,notebooks)•LCDmonitorinverter(largepanels)•Telecomequipment(TeleLink)•AutomotiveElectronicsmodules–Telematics,climatecontrol,navigation,bodycontrollersTargetapplications:Protectionofinvertercircuit(LCD)DCinputCommon/groundInvertercircuitDCinputPowersystemMLV(MLAseries)Diode(SMAseries)ChipfuseNano2fuseProtectionofDCbus(HDD)DatabusVBUSSignalGroundHDDunitRibboncable/connectorMotherboard0402,0603MLVSMAJdiodeShieldGround0467–Pb-free0434–Pb/Sn0435–Pb-freeD0DnInverterFuseInverter13ConfidentialandProprietarytoLittelfuse,Inc.