LLC計算(L6599-ST)培訓課件

L6599PERIPHERALCOMPONENTSDESIGN:,,,,enterdataintocyancells,,,,,,,

Minimumoperatingfrequency:,f.sw.Min=,54.07,(kHz),Fromresonantstagecalculationsheet,,,,,,,

Maximumoperatingfrequency:,f.sw.max=,112.35,(kHz),Fromelectricalspecsheet,,,,,,,

Start-upfrequency:,f.start=,300,(kHz),Suggestedvaluethreetofourtimesf.sw.Min,,,,,,,

SelectCosccapacitor:,C.f=,330,(pF),Typicalvaluesare220÷1000pF,,,,,,,

Minimumfrequencysettingresistor:,R.fmin=,18.680,(kΩ),Pleaseusethenearestvalue,,,R.fmin=,10,(kΩ),,

Soft-startfrequencysettingresistor:,R.ss=,2.199,(kΩ),Pleaseusethenearestvalue,,,R.ss=,3.3,(kΩ),,

Soft-starttimingcapacitor:,C.ss=,0.909,(μF),Pleaseusethenearestvalue,,,C.ss=,1,(μF),,

Maximumfrequencysettingresistor:,PLEASEUSERfmax_1ORRfmax_2IFONLYCONTINUOSSWITCHINGOPERATION,,,,,,,,,,

,ISALLOWEDORBURSTMODEOPERATIONATLIGHTLOADISNEEDED,,,,,,,,,,

IfStand-bypinisconnectedtopin#4:,R.fmax_1=,9.279,(kΩ),Pleaseusethenearestvalue,,,R.fmax_1=,10,(kΩ),,

IfBurstmodeisused:,R.fmax_2=,3.480,(kΩ),Pleaseusethenearestvalue,,,R.fmax_2=,3.9,(kΩ),,

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Currentprotectioncircuit:,,,,,,,,,,,

"Twosensingsolutionscanbeused,pleaseselectoneandfollowthecalculation.",,,,,,,,,,,

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Nominalresonanttankpeakcurrent:,I.rt.peak=,0.357,(Apeak),calculatedatV.dc.min,,,,,,,

Maximumoverloadcurrentatprimary:,I.cr.pk=,4.9,(Apk),selectatleast1.1to1.2timesI.rt.peak,,,,,,,

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A)USINGCURRENTSENSINGBYRESISTOR:,,,,,,,,,,,

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Filterresistor:,R.A=,4.7,(kΩ),Typicalvaluesare1÷10kOhm,,,,,,,

Currentsenseresistor:,R.s=,0.816,(Ω),Pleaseusethenearestvalue,,,,,R.s=,0.91,(Ω)

Powerdissipation:,P.d=,0.029,(W),Pleaseselectresistorwithsuitablepowerrating,,,,,,,

Filtercapacitor:,C.A=,0.039,(μF),Pleaseusethenearestvalue,,,,,C.A=,0.033,(μF)

B)USINGCURRENTSENSINGBYCURRENTDIVIDER(LOSSLESS):,,,,,,,,,,,

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Seriesresistor:,R.A=,100,(Ω),Typicalvaluesare47÷220Ohm,,,,,,,

Seriescapacitor:,C.A=,400,(pF),Pleaseusethenearestvalue,,,,C.A=,390,(pF),

Parallelresistor:,R.B=,53,(Ω),Pleaseusethenearestvalue,,,,R.B=,56,(Ω),

Parallelcapacitor:,C.B=,33,(nF),Pleaseusethenearestvalue,,,,C.B=,33,(nF),

Delaypin(#2):,,,,,,,,,,,

Overloaddelaycapacitor:,C.delay=,0.47,(μF),Typicalvaluesare0.1÷1uF,,,HastobefoundbytrialtogetthebestsuitableTSHduringoverload(seeL6599data-sheet),,,,

Allowedworkingtimeatsoftstartfreq.:,T.mp=,4.7,(ms),Converteroperationtimeatsoftstartfrequencyf.startduringoverload(seeL6599data-sheet),,,,,,,

Off-timeduringhic-cupmode:,T.stop=,1000,(ms),Typicalvaluesare0.2÷1s,,,,,,,

Overloaddelayresistor:,R.delay=,851,(kΩ),Pleaseusethenearestvalue,,,,R.delay=,820,(kΩ),(donotexceed1.2MΩ)

Linepin(#8)usedforsequencing:,,,,,,,,,,,

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ConverterONthresholdforstart-up:,V.on=,370,(V),MinimumvoltagefromPFCforcorrectoperations,,,,,,,

ConverterOFFthresholdforshut-down:,V.dc.min=,320,(V),MinimumvoltagefromPFCduringmainsdips,,,,,,,

Lined