FlybackTra
sformer3
465WFlybacktra
sformerDesig
Example
1TypeI
putACLi
eVoltagea
dFreque
cyVac85Vacfs60Hz2TypeOutputPowera
dEfficie
cyPout465Wη80Pi
58125W265Vac
Pi

Pout
h
Vac_pkVmi

3TypeDCli
kcapacitorvaluea
dmi
imumDCli
kvoltageCi
150uF2Pi
Vmi
Vac_pk2Vmi
894V4TypeSMPSswitchii
gfreque
cyfsw70kHz
Ci
fs
fig1DCLi
kCapVoltage
5TypeSMPSMaxDutyDuty_max6Calculatedvaluestswto
_maxIi
_dc_avgIpk
045
tsw
ususAA
1fsw
142857164285710731
to
_maxtswDuty_max
ABC
Ipk
ACB
7IftheaboveIpkistoohightypelowerIpkIpk_mosfet25A
Pi
Ii
_dc_avgVmi
Ii
_dc_avgIpk2Duty_max
Ipk_i
i
Ipk_sps
Ii
_dc_avg
Duty_max
to
_max
Ipk_i
iΔI
06A19A
Ipk_i
iIpkIpk_sps
tsw
fig2CCMDCM
Vi
to
_max8CalculatedLmvalueLmDILm3025uHAccordi
gtothedesiredoperati
gmodefig2ADCMorCCCMcha
getheIpk_mosfetIfyouwa
tDCMi
creaseIpk_mosfetIfyouwa
tCCMdecreaseIpk_mosfet
9Typecorei
formatio
Acore814ΔB02TESLASelectacoreaccordi
gtotheoutputpowerfromtheCoreDataSheetΔBshouldbelesstha
50ofBsatVmi
10Typeoutputvoltagea
ddiodeforwarddropVo12VVFW05V11CalculatedvaluesNp
NsA
B
AB
Np
353018658516366032819
Vi
to
_maxAcoreDBNpVi
Duty_max
Ns
VoVFW1Duty_max

VoVFW
Duty_max
to
_max
tsw
fig3Tra
sformerE
ergy
NpNs

12Type
umberoftur
stodetermi
etheotheroutputsNp35Tur
Tur
Ns62416666736254833333351041667Tur
VVoVFW612525520833300Voiscalculatedbasedo
VFW07V13Calculatedwi
di
gdiameter
Vo34666666675557633333333971666666711851383333330707
1
fFlybackTra
sformer3
DCMcaseIi
_rmsId_rmsAwiAwgpAwgs0735867476049364644304328821101022AAmm2mmmm
CCMcaseIi
_rmsId_rmsAwiAwgpAwgs11029517135238546545405299661347952AAmm2mmmm
2
fr