IEC 61000 ESD, EFT, and Surge Bus Protection for CAN ...

1 1 TIDUB36B March2016 RevisedJanuary2017 SubmitDocumentationFeedbackCopyright 2016 2017,TexasInstrumentsIncorporatedIEC 61000 ESD,EFT,and SurgeBus Protectionfor CANR eferenceDesignTI DesignsIEC 61000 ESD,EFT,and SurgeBus Protectionfor CANR eferenceDesignTI DesignsTI Designsprovidethe foundationthat you needincludingmethodology,testingand designfiles toquicklyevaluateand customizethe Designshelpyouaccelerateyourtime to E2E BoardLevelIEC 61000 -4-2 ESDE valuation BoardLevelIEC 61000 -4-4 EFT Evaluation BoardLevelIEC 61000 -4-5 SurgeEvaluation EasyControlof TransceiversLogicI/O Pins Pad Site Evaluationof MultipleTVSD iodeStructures BournsTransientBlockingUnit (TBU)HighSpeedProtection BournsRadialLeadedMetalOxideVaristor(MOV )OvervoltageProtection BournsThyristorOvervoltageProtection BournsGas DischargeTube(GDT)

2 OvervoltageProtection GeneralPurposeEvaluationModuleFor Half-DuplexTI CANT ransceiversFeaturedApplications ClassicalCANand CANFD Operationin HighlyLoadedCANN etworksDownto 10- kbpsNetworksUsingTXDDTO IndustrialAutomation,Control,Sensors,and DriveSystems Building,Security,and ClimateControlAutomation CANBus StandardsSuchas CANopen,DeviceNet,NMEA2000,ARNIC825,ISO1 1783,andCANaerospaceAn IMPORTANTNOTICEat the end of this TI referencedesignaddressesauthorizeduse, intellectualpropertymattersand otherimportantdisclaimersand March2016 RevisedJanuary2017 SubmitDocumentationFeedbackCopyright 2016 2017,TexasInstrumentsIncorporatedIEC 61000 ESD,EFT,and SurgeBus Protectionfor CANR eferenceDesign1 DesignOverviewIndustrialnetworkssuchas CAN,RS-485,RS-422,RS-232,and Profibusare expectedto withstandharshsystem-leveltransientsin theirend be causedbyelectrostaticdischargeduringhand ling,interruptionof inductiveloads,relaycontactbounce.

3 Or meettheserequirementscan be challengingwithoutthe propertoolsand knowledgeaboutthe standardsthat the 61000 ESD,EFT,and SurgeBus Protectionfor CANR eferenceDesign(TIDUB36) showsapracticalexampleof how to protectthe ISO 11898standard,the IEC 61000 -4-xtransienttest standards,andthe implementationof systemlevelprotectionagainstthesetransie ntswith manystandardsthat may be referencedby engineerslookingto ensureESDrobustnessin theirend (HBM),MachineModel(MM),and ChargedDeviceModel(CDM)are themostcommonESDstandardsin industry,as mostvendorsprovidedataon theseparametersin thesupportingdocumentationfor a not take into accountsystem-levelESDeventsand are solelymeantas thedevicemakesit throughthe handlingand assemblyprocesswithoutbeingdamagedby ,MM,and CDMare sufficientmodelsfor manyapplications,but someindustrialapplicationsaresubjectedto o muchgreaterstressesthanthe energylevelsthat next threesectionsdiscussthe IEC 61000 -4-2 ElectrostaticDischargeImmunityTest,IEC 61000 -4-4 ElectricalFastTransient/BurstImmunityTes t.

4 The IEC 61000 -4-5 SurgeImmunityTeststandardsand the expectedlevelsof energythe industrialsystemmay March2016 RevisedJanuary2017 SubmitDocumentationFeedbackCopyright 2016 2017,TexasInstrumentsIncorporatedIEC 61000 ESD,EFT,and SurgeBus Protectionfor 61000 -4-2 ElectrostaticDischargeImmunityTestThe IEC 61000 -4-2 ESDimmunitytest is a system-levelESDtest that imitatesa chargedoperatordischargingontoan end characteristicsof the IEC ESDtest differfromthat of otherESDstandardsin rise times,the amountof energydeliveredduringthe strike,and the numberof strikesadministeredduringthe two typesof testingmethodsinvolvedwith the IEC ESD:contactdischargeand air contactESDtest dischargesan ESDpulsefroman IEC ESDgun directlyontothe deviceundertest (DUT).

5 The air ESDdischargetest involvesmovingthe chargedESDgun towardsthe DUTuntil the air breaksdownenoughto allowconductionof the ESDstrikebetweenthe ESDgun and the IEC ESDtestingis performedwith bothpositiveand negativepolarities,and a passingscoreis not achievedunlessbothpolaritiesat a singlelevelare the IEC 61000 -4-2 ESDtest voltagelevelsand the IEC 61000 4-2 ESDTestVoltageLevelsCONTACTDISCHARGEAIR DISCHARGEL evelTestVoltage(kV)PeakCurrent(A)LevelTe stVoltage(kV) *SpecialSpecial*SpecialNOTE:* is an levelmustbe specifiedin the specified,specialtest equipmentmay be showsthe basicshapeof the IEC ESDpulseand showsthe timingsequenceof the test CurrentWaveformof the IEC ESDP ulseand TimingSequenceof the March2016 RevisedJanuary2017 SubmitDocumentationFeedbackCopyright 2016 2017,TexasInstrumentsIncorporatedIEC 61000 ESD,EFT,and SurgeBus Protectionfor 61000 -4-4 ElectricalFastTransientand BurstImmunityTestThe IEC 61000 -4-4electricalfast transient(EFT)

6 Or burstimmunitytest is meantto simulatethe switchingtransientscausedby the interruptionof inductiveloads,and EFT test isperformedon powerlines,I/O datalines,I/O controllinesand EFT test is a burstofpulsesthat havepredeterminedamplitudeand typicaldurationof a burstis 15 ms ata repetitionrate of 5 kHz,although100 kHz repetitionis a morerealistictest. The burstperiod,whichisthe time fromthe startof one burstto the startof the next burst,is 300 ms. The test requirestheapplicationof six burstframesof ten secondsdurationwith ten atypicalEFT test sequence3 millionpulsesare deliveredto the DUTthrougha capacitiveclampwhichcouplesthe energyinto the lists the IEC 61000 -4-4 EFT test voltagelevelsand repetitionrates:Table2.

7 IEC 16000 4-2 ESDTestVoltageLevelsON POWERPORT,PEON I/O SIGNAL,DATAANDCONTROLPORTSL evelTestVoltage(kV)RepetitionRate(kHz)Te stVoltage(kV)RepetitionRate(kHz) or or 100215 or or 100325 or 10015 or 100445 or 10025 or 100*SpecialSpecial*SpecialNOTE:* is an levelmustbe specifiedin the showsthe basicshapeof the IEC EFT pulseand showsthe timingsequenceof the test VoltageWaveformof an EFT (Burst)Pulseand TimingSequenceof an March2016 RevisedJanuary2017 SubmitDocumentationFeedbackCopyright 2016 2017,TexasInstrumentsIncorporatedIEC 61000 ESD,EFT,and SurgeBus Protectionfor 61000 4-5 SurgeImmunityTestThe IEC 61000 -4-5surgeimmunitytest is the mostseveretransientimmunitytest in termsof test is meantto simulatetransientscausedby director indirectlightningstrikesas well asthe switchingof powersystemsincludingload changesand surgegenerator s outputwaveformsare specifiedfor openand this test are high current(dueto low generatorimpedance)

8 And long the surgeimmunitytest is approximately1000timeslongerthanthat of IEC ESDandIEC EFT,resultingin test requiresfive positivesurgepulsesand five negativesurgepulseswith a time intervalbetweenpulsesof one ,this time intervalis reducedto somethingshorterthanone minuteto help reduceoveralltest lists the IEC surgeopencircuitvoltagetest IEC SurgeOpenCircuitVoltageTestLevelsLEVELOP EN-CIRCUITVOTLAGE 10%(kV) *SpecialNOTE:* May be any levelabove,below,or in betweenthe levelmay be specifiedin the showsthe basicshapeof the IEC surgepulseand showsthe timingsequenceof the test Voltageand CurrentWaveformof a SurgePulseand TimingSequenceof a March2016 RevisedJanuary2017 SubmitDocumentationFeedbackCopyright 2016 2017,TexasInstrumentsIncorporatedIEC 61000 ESD,EFT,and SurgeBus Protectionfor CANR eferenceDesign3 SystemDescriptionIn this TI Design,thereare four differentprotectioncircuitarchitecturesu singdevicesfromBournsInc.

9 Circuitone encompassesa TVSdiodeon the bus pins,circuittwo implementsthe sameTVSdiodeon thebus pins alongwith metaloxidevaristors(MOVs)and a transientblockingunit (TBU).Circuitthreeagainusesthe TVSdiodeand TBU,but the MOVis replacedby a thyristor,and in circuitfour the thyristorisswappedfor a gas dischargetube(GDT).All of thesecircuitsprovideprotectionfor the CANtransceiverfromlethalESD,EFT (burst),and TVSdiodeacts as a clampingcircuitredirectingthe transientenergyto ground, MOV,thyristor,and GDTprotectthe BournsTBUfromexposureto excessivetransientvoltage,clampingthe transientto a levelless thanthe transientcurrentexceedsthe TBUtriggercurrentlimit,the sub-microsecondresponseof theTBUlimitsthe currentflow to the MOV,thyristor,and GDTreducethe transientsto a fewhundredvoltsof clampingvoltagewhilethe TBUslimit transientcurrentto less than1 mA.

10 Figure4 showsthe TI Designwith all CANT ransceiverWithTVSD iode,MOV,Thyristor,GDT,and Standardand Transceivers7 TIDUB36B March2016 RevisedJanuary2017 SubmitDocumentationFeedbackCopyright 2016 2017,TexasInstrumentsIncorporatedIEC 61000 ESD,EFT,and SurgeBus Protectionfor CANR eferenceDesign4 ISO11898-42 Standardand 2 StandardControllerareanetworkor CANis an InternationalStandardizationOrganization (ISO)definedserialcommunicationbus originallydevelopedfor the automotiveindustryto replacethe complexwiringharnesswith a two-wirebus. The specificationcallsfor high immunityto electricalinterferenceand the abilitytoself-diagnoseand to expandedpopularityfor CANin industrialapplicationssuchas buildingautomation,processcontrolautomat ion,elevators,constructio