AN-4137-SMPS-仙童反激式隔离开关电源设计工具

ByChoiBluecellistheinputparametersRedcellistheoutputparameters1.DefinethesystemspecificationsMinimumLinevoltage(Vlinemin)85V.rmsMaximumLinevoltage(Vlinemax)265V.rmsLinefrequency(fL)60HzVo(n)Io(n)Po(n)KL(n)1stoutputforfeedback3.3V2.00A7W142ndoutput5V2.00A10W213rdoutput12V1.50A18W384thoutput18V0.50A9W195thoutput33V0.10A3W76thoutputVA0W0Maximumoutputpower(Po)=46.9WEstimatedefficiency(Eff)70%Maximuminputpower(Pin)=67.0W2.DetermineDClinkcapacitorandDClinkvoltagerangeDClinkcapacitor(CDC)150uFMinimumDClinkvoltage(VDCmin)=92VMaximumDClinkvoltage(VDCmax)=375V3.DetermineMaximumdutyratio(Dmax)Maximumdutyratio(Dmax)0.48MaxnominalMOSFETvoltage(Vdsnom)=460VOutputvoltagereflectedtoprimary(VRO)=85V4.Determinetransformerprimaryinductance(Lm)SwitchingfrequencyofFPS(fs)66kHzRipplefactor(KRF)0.33Primarysideinductance(Lm)=671uHMaximumpeakdraincurrent(Idspeak)=2.01ARMSdraincurrent(Idsrms)=1.07A##MaximumDClinkvoltageinCCM(VDCCCM)375V5.ChoosetheproperFPSconsideringtheinputpowerandcurrentlimitTypicalcurrentlimitofFPS(Iover)2.50AMinimumIoverconsideringtoleranceof12%2.20AA-O.K.6.DeterminethepropercoreandtheminimumprimaryturnsSaturationfluxdensity(Bsat)0.35TCrosssectionalareaofcore(Ae)109.4mm2FPSDesignAssistantver.1.202.01IEDCIEDCRFIIK2)(1)(1CCMKDCMKRFRFMinimumprimaryturns(Npmin)=43.8T7.DeterminethenumberofturnsforeachoutputVo(n)VF(n)#ofturnsVcc(UseVccstartvoltage)12V1.2V6.9=71stoutputforfeedback3.3V0.5V2=22ndoutput5V0.5V2.9=33rdoutput12V1.2V6.9=74thoutput18V1.2V10.1=105thoutput33V1.2V18.0=186thoutput0V0V0.0=0VF:ForwardvoltagedropofrectifierdiodePrimaryturns(Np)=45---enoughturnsUngappedALvalue(AL)2130nH/T2Gaplength(G);centerpolegap=0.34631mm8.DeterminethewirediameterforeachwindingDiameterParallelID(n)rms(A/mm2)Primarywinding0.5mm1T1.1A5.44Vccwinding0.3mm2T0.1A0.711stoutputwinding0.4mm4T3.5A6.972ndoutputwinding0.4mm4T3.7A7.303rdoutputwinding0.4mm3T2.8A7.304thoutputwinding0.4mm2T0.9A3.765thoutputwinding0.4mm1T0.2A1.556thoutputwindingmmT#####A#####Copperarea(Ac)=19.70mm2Fillfactor(KF)0.15Requiredwindowarea(Awr)131.33mm29.ChoosetherectifierdiodeinthesecondarysideVD(n)ID(n)rmsVccdiode70V0.10A1stoutputdiode20V3.50A2ndoutputdiode29V3.67A3rdoutputdiode70V2.75A4thoutputdiode103V0.95A5thoutputdiode184V0.19A6thoutputdiode0V#####A10.Determinetheoutputcapacitor1stoutputcapacitor2000uF100mΩ2.9A0.642ndoutputcapacitor2000uF100mΩ3.1A0.673rdoutputcapacitor330uF300mΩ2.3A1.534thoutputcapacitor470uF300mΩ0.8A0.52ΔVo(n)Co(n)RC(n)Icap(n)5thoutputcapacitor47uF480mΩ0.2A0.186thoutputcapacitoruFmΩ#####A#####11.DesignRCDsnubberPrimarysideleakageinductance(Llk)4uHMaximumVoltageofsnubbercapacitor(Vsn)160VMaximumsnubbercapacitorvoltageripple7%Snubberresistor(Rsn)=22.4㏀Snubbercapacitor(Csn)=9.7nF0.185Powerlossinsnubberresistor(Psn)=1.1W(InNormalOperation)PeakdraincurrentatVDCmax(Ids2)=1.75AMaxVoltageofCsnatVDCmax(Vsn2)=147VMaxVoltagestressofMOSFET(Vdsmax)=521V12.DesignFeedbackcontrolloopControl-to-outputDCgain=2Control-to-outputzero(wz)=5000rad/s=fz=HzControl-to-outputRHPzero(wrz)=694765rad/s=frz=HzControl-to-outputpole(wp)=2153rad/s=fp=HzVoltagedividerresistor(R1)5.6㏀Voltagedividerresistor(R2)=18㏀Optocouplerdioderesistor(RD)1㏀KA431Biasresistor(Rbias)1.2㏀Feebackpincapacitor(CB)=33nFFeedbackCapacitor(CF)=47nFFeedbackresistor(RF)=1.2㏀Feedbackintegratorgain(wi)=11398rad/s=fi=HzCompensatorzero(wzc)=3129rad/s=fzc=HzCompensatorpole(wpc)=10101rad/s=fpc=Hz163.641054144.716-2-88.7253.633740.925-2-88403.600993336.840-4-86.8633.531672932.863-6-851003.362222528.7100-9-82.21602.965162124.4160##-77.92502.205751820.3250##-72.24000.895571515.9400##-65.2630-0.65011312.1630##-59.71000-2.0185118.751000##-58.31600-2.901695.741600##-62.12500-3.327562.742500##-68.54000-3.52573-0.84000-8-75.26300-3.5983-1-4.56300-7-80.2796110,6314981,6081,815343vo1RDiDRbiasR1R2BibiasCBvFB1:1FPSvo1'CFRFKA431-40-20020406010100100010000100000Gain(dB)frequency(Hz)Control-to-outputCompensatorT(Closedloopgain)10000-3.6107-5-8.410000-8-83.716000-3.5697-9-1216000##-8625000-3.4485#-1625000##-87.540000-3.1334#-2040000##-88.463000-2.448#-2363000##-89100000-1.0745#-261E+05##-89.4-180-150-120-90-60-30010100100010000100000Phase(degree)frequency(Hz)Control-to-outputCompensatorT(Closedloopgain)ByChoi%%%%%%TTTTTTTT(A/mm2)VVVVΔVo(n)VV##############vo1RDiDRbiasR1R2BibiasCBvFB1:1FPSvo1'CFRFKA431100000######100000FlybackTransformerDesign步驟參數數據單位NoteVINacmin85VacrmsVINacmax265VacrmsVindcmin100.19VVIN(min)=85*√2-20=100VVindcmax354.71Vfs70000HzTs1.43E-05sVo12VdcIo0.5AVf1V輸出整流管壓降Vds10VMos源漏極導通壓降η0.7Po6WPt14.57143WPt=Po/η+Po傳遞功率Dmax0.45Dmin0.187719Dmin=Dmax/{(1-Dmax)×Ku+Dmax}Ku3.540373Ku=Upimax/Up1minDonsDoffs△t60oCCCM&DCMNote:CORE材質TDKPC44μi2400±25%Pvc300KW/m2100KHZ,100℃BS0.39T飽和磁通Br0.06T剩磁100℃Tc=215℃Bm0.33T工作磁感应强度0.12--0.25T与输出功率和频率成反比△B0.198TPt14.57143WPt=Po/η+Po傳遞功率J400A/cm^2電流密度A/cm2(300~500)Ku0.2繞組系數0.2~0.5.AP0.065708cm^4AP=AW*Ae=(Pt*10^4)/(2ΔB*fs*J*Ku)2形狀及規格確定.Ae23mm^2磁芯有效截面积Aw54.04mm^2繞线截面积（鐵芯窗口面積）AL1250nH/N2磁芯无气隙时的等效电感le39.4mm磁路长度AP0.124292cm^4面積乘積Ve900mm^3磁芯体积Wt4.8g磁芯重量Pcl0.42100℃(W)磁芯最大损耗step0Define