LLC计算(L6599-ST)

HALF-BRIDGELLCRESONANTCONVERTERL6599-basedDesignSpreadsheetVersion1.0ThisworkbookenablestheusertodesignanL6599-basedsingle-outputhalf-bridgeLLCresonantconverter.Theprocedureisintendedforaconverterworkingwithafront-endPFCpreregulatorprovidingthesupplybustotheresonantstage.Itiscomposedof5worksheets(besidesthepresentone),eachdedicatedtoaspecifictask:♦EL_SPEC:inputofconverter'selectricalspecificationandofsomepre-designchoices♦MOS+OUTPUT_STAGE:selectionofthepowerswitch(MOSFET)andofthesecondaryrectifierandoutputcapacitor♦RES_STAGE:calculationoftheresonantconverterparameters♦L6599:selectionofICbiasingcomponents♦SUMMARY:summarizesthecalculationresultsandshowsthebasicelectricalschematicItisrecommendedtousetheworkbookstartingfromthefirstsheetandproceedingfollowingtheordershown.Ineachworksheet,cyancellsrefertodatathatmustbeenteredbytheUser,yellowcellsrefertocalculationresultswhichneedsafurthercheckorastandardvaluechoice.ELECTRICALSPECIFICATIONS:Converterspecification:NOTES:NominalsupplyBUSvoltage:V.dc.nom=395(V)wheretheoperatingfrequencyequalstheresonantfrequencyf.sw=f.rMinimumsupplyBUSvoltage:V.dc.min=320(V)dependingonthehold-upcapabilityofthePFCpre-regulatorMaximumsupplyBUSvoltageV.dc.max=420(V)dependingontheOVPlevelofthePFCpre-regulatorNominaloutputvoltage:V.out=36(V)Maximumoutputpower:P.out=3.333(W)Outputvoltageripple:ΔVout=100(mV)Expectedefficiency:η%=97.5%onlyresonantconvertercircuitPre-designchoices:Minimumoperatingfrequency:f.sw.min=51.2(kHz)Maximumoperatingfrequency:f.sw.max=112.35(kHz)Straycapacitanceathalf-bridgenode:C.stray=120(pF)foreseenvaluewithoutC.osscontributionK.conf=1incaseoffullbridgerectificationK.conf=2incaseoftransformercentertapwindingenterdataintocyancellssuggestion:1:2rangeSecondaryoutputrectifierconfiguration:K.conf=2outputrequirementsenterdataintocyancellsHalf-bridgemosfetstress:I.MOS=0.017(Arms)estimatedmaxoperatingdraincurrentV.DS=420(V)maxoperatingdrain-sourcevoltageV.(br).DSS=500(V)suggestedbreakdownvoltageR.(DS)on=35.710(Ω)suggestedONresistanceat25°CSelectthesuitablemosfetfromYourdata-baseandwritetherequiredparametervaluesbelow:Mosfettype:FillwithyourselectedpartnumberChosenmosfetparameters:R.DS.on=0.35(Ω)ONresistanceat25°C(frommosfetdata-sheet)k.mos=1.6TemperaturemultiplierforRds.ONat100°CC.oss=90(pF)EffectivedraincapacitanceOutputdiodestress:I.DIODE=0.073(Arms)estimatedmaxdiodermscurrentI.D.avg=0.046(Aavg)estimatedmaxdiodeavgcurrentV.RRM=86(V)minimumsuggestedbreakdownvoltage(with20%derating)SelectthesuitablediodefromYourdata-baseandwritetherequiredparametervaluesbelow:Diodetype:FillwithyourselectedpartnumberChosendiodeparameters:V.F=1.06(V)diodeforwarddropthreshold(fromdiodedata-sheet)R.d=36(mΩ)diodedynamicresistanceI.R=240(µA)diodeleakagecurrentPowerlosses:Maxtotalpowerdissipation:P.diss.tot=0.085(W)forexpectedefficiencyηMosfetpowerdissipation:P.d.mos=0.036(W)(totaldissipationofhalf-bridgemosfets)Diodepowerdissipation:P.d.rect=0.116(W)(totaldissipationofoutputdiodes)Outputvoltageripple:ΔVout=100(mV)MaxcapacitorESR:ESR.max=686(mΩ)Capacitorripplecurrent:I.o.ac.max=0.045(A)OUTPUTCAPACITORSELECTION:HALF-BRIDGEMOSFETSELECTION:STP14NK50ZFPSTTH8L06FPOUTPUTDIODESELECTION:Parameterschoice:Resonancefrequency:f.r=90(kHz)selectavaluebetweenf.sw.minandf.sw.msxMarginfactorforQ.minvalue:k.marg=0.94startingvalueintherange:0.80-0.95Calculations:Idealtransformertransferratio:n=5.329Maximumrequiredgain:M.max=1.234Minimumrequiredgain:M.min=0.940Maxnormalizedfrequency:f.n.max=1.248ACequivalentresistance:R.ac=9214.806(Ω)Inductanceratio(L.r/L.m):λ=0.177Minimumqualityfactorvalue:Q.zvs=0.008Minoperatingfrequency:f.sw.Min=54.075(kHz)Incasethecalculatedminfrequencyf.sw.MinislowerMinimumnormalizedfrequency:f.n.min=0.601orhigherthantheexpectedfrequencyf.sw.min,pleaseincreaseordecreasetheresonancefrequencyf.r,unlessPleasecheck=f.sw.min=51.2(kHz)youaccepttheobtainedminimumswitchingfrequencyvalue.Calculatedresonantcapacitorvalue:C.r=23.192(nF)Pleaseusethehigherstandardvalue:C.r.std=40(nF)Transformerturnratio:N.T=5.780Transformerleakageinductance:L.r=78.000(μH)Transformerprimaryinductance:L.p=520.000(μH)PrimarysidermscurrentI.prim.rms=0.253(A)SecondarysidermscurrentI.sec.rms=0.073(A)X=10.594Incasetherelationship:TgΦ≥Xisnotverified,TgΦ=42.119choosealowervaluefork.marg,anditeratetheprocess.Pleasecheck=enterdataintocyancellsHALF-BRIDGERESONANTCONVERTERDESIGN:Minimumoperatingfrequency:f.sw.Min=54.07(kHz)FromresonantstagecalculationsheetMaximumoperatingfrequency:f.sw.max=112.35(kHz)FromelectricalspecsheetStart-upfrequency:f.start=300(kHz)Suggestedvaluethreetofourtimesf.sw.MinSelectCosccapacitor:C.f=330(pF)Typicalvaluesare220÷1000pFMinimumfrequencysettingresistor:R.fmin=18.680(kΩ)PleaseusethenearestvalueR.fmin=10(kΩ)Soft-startfrequencysettingresistor:R.ss=2.199(kΩ)PleaseusethenearestvalueR.ss=3.3(kΩ)Soft-starttimingcapacitor:C.ss=0.909(µF)PleaseusethenearestvalueC.ss=1(µF)Maximumfrequencysettingresistor:IfStand-bypinisconnectedtopin#4:R.fmax_1=9.279(kΩ)PleaseusethenearestvalueR.fmax_1=10(kΩ)IfBurstmodeisused:R.fmax_2=