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PKS606Y Datasheet(PDF) 9 Page - Power Integrations, Inc. |
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PKS606Y Datasheet(HTML) 9 Page - Power Integrations, Inc. |
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9 / 24 page  PKS603-607 Rev. I 10/06 offthepowersupply.Thisprotectstheloadandsupplyfrom acontinuousfaultcondition.RemovingtheACinputresets thiscondition. TheoutputvoltageisdeterminedbytheZenerdiodeVR2,the voltagedropacrossR12andtheforwarddropofD9andtheLED ofoptocouplerU2.ResistorR13providesbiascurrentthrough D9andVR2,toensurethatVR2isoperatingclosetoitsknee voltage,whileR12setstheoverallgainofthefeedbackloop. CapacitorC15boostshighfrequencyloopgaintohelpdistribute theenabledswitchingcyclesandreducepulsegrouping. Whentheoutputvoltageexceedsthefeedbackthresholdvoltage, currentwillflowintheoptocouplerLED,causingcurrentflowin thetransistoroftheoptocoupler.WhenthisexceedstheENABLE pinthresholdcurrentthenextswitchingcycleisinhibited,asthe outputvoltagefalls(belowthefeedbackthreshold)aconduction cycleisallowedtooccurandbyadjustingthenumberofenabled cyclesoutputregulationismaintained.Astheloadreduces thenumberofenabledcyclesdecreases,loweringtheeffective switchingfrequencyandscalingswitchinglosseswithload. Thisprovidesalmostconstantefficiencydowntoverylight loads,idealformeetingenergyefficiencyrequirements. PeakSwitch deviceU1issuppliedfromanauxillarywinding onthetransformerwhichisrectifiedandfilteredbyD7andC6. ResistorR7providesapproximately2mAofsupplycurrentinto theBYPASSpincapacitorC8.Duringstartuporfaultconditions whenthebiasvoltageislow,theBYPASSpinissuppliedfrom ahighvoltagecurrentsourcewithinU1,eliminatingtheneed forseparatestartupcomponents. Components Q1-2, R9-11, R14, C13, C16, and VR3 form anovervoltageandovercurrentprotectioncircuit.Anoutput overvoltageorovercurrentconditionfiresSCRQ2,clamping theoutputvoltageandforcingPeakSwitchU1intolatching shutdownafter30ms.ThelowpassfilterformedbyR10and C13addsadelaytotheover-currentsense.Theshutdown conditioncanberesetbybrieflyremovingACpowerfor~3 seconds(maximum).ThelatchingfunctionwithinPeakSwitch significantlyreducesthesizeoftheSCRandoutputrectifier, D8,astheshortcircuitcurrentonlyflowsfor50msbeforethe supplylatchesoff. This design meets EN55022 Class B conducted EMI with >10dBmarginevenwiththeoutputRTNdirectlyconnected toearthground. Key Application Considerations PeakSwitch Design Considerations Output Power Table Thedatasheetmaximumoutputpowertable(Table1)represents themaximumpracticalcontinuousoutputpowerlevelthatcan beobtainedunderthefollowingassumedconditions: 1.TheminimumDCinputvoltageis100Vorhigherfor 85VACinput,or220Vorhigherfor230VACinputor single100/115VACwithavoltagedoubler. 2.Efficiencyof70%forY/Fpackageddevices,75%forP packageddevicesat85-265VAC,75%for230VACinput allpackages 3.MinimumdatasheetvalueofI2f 4.Transformerprimaryinductancetoleranceof±10% 5.Reflectedoutputvoltage(V OR)of135V 6.Voltageonlyoutputof15VwithanultrafastPNrectifier diode 7.ContinuousconductionmodeoperationwithtransientK P* valueof0.25 8.Sufficientheatsinkingisprovided,eitherexternally(Y/F packages)orthroughanareaofPCboardcopper(Ppackage) tokeeptheSOURCEpinortabtemperatureatorbelow 110°C. 9.Deviceambienttemperatureof50°Cforopenframedesigns and40°Cforsealedadapters *Belowavalueof1,K P is the ratio of ripple to peak primary current.Topreventreducedpowercapabilityduetopremature terminationofswitchingcycles,atransientK Plimitof≥0.25is recommended.Thisavoidstheinitialcurrentlimit(I INIT)being exceededatMOSFETturnon. Peak vs. Continuous Power PeakSwitch deviceshavecurrentlimitvaluesthatallowthe specifiedpeakpowervaluesinthepowertable.Withsufficient heatsinking,thesepowerlevelscouldbeprovidedcontinuously, however this may not be practical in many applications. PeakSwitch isoptimizedforuseinapplicationsthathaveshort duration,highpeakpowerdemand,butasignificantlylower continuousoraveragepower.TypicalratioswouldbeP PEAK≥ 2×P AVE.ThehighswitchingfrequencyofPeakSwitchallows asmallcoresizetobeselectedtodeliverthepeakpower, buttheshortdurationpreventsthetransformerwindingfrom overheating.Asaveragepowerincreases,itmaybenecessaryto selectalargertransformertoallowincreasedcopperareaforthe windingsbasedonthemeasuredtransformertemperature. The power table provides some guidance between peak power and continuous power in sealed adapters, however specific applications may differ. For example, if the peak powerconditionisverylowdutycycle,saya2secondpeak occurringonlyatpoweruptoaccelerateaharddiskdrive, thenthetransformer’sthermalriseisonlyafunctionofthe continuouspower.However,ifthepeakpoweroccursevery 200msfor50msthenitwouldneedtobeconsidered. Inallcases,theacceptabletemperatureriseofthePeakSwitch andtransformershouldbeverifiedunderworstcaseambient andloadconditions. |
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