Step-1:X’fmrTurnratingInputVoltage:8~20VdcMaxturnonduty:76%Lampvoltage:700Vrms(w/ooutputcap.)N=700/√(72*.76)=113Step-2:CalculateNpNp=Vin×ton/(B×Ae)Where          Np=Minimumnumberofprimaryturns  Vin=Inputvoltage(volts)  ton=ON-timeoftheN-MOSswitches(s)B=Corefluxdensityswing(tesla)          Ae=Smallestcrosssectionareaofthe    corewherefluxflows(mm2)  Ns=Np×N

應該是關機時序的問題造成,在實際應用在產品上應該不會有問題