反激式开关电源的设计方法

1/141:1.11.2.1.3PCBLayout.1.4.1.5.2:2.12.22.3PCBLayout.2.4.2.4.1:GaussxNpxAeLpxIpB100(max)B(max)=(Gauss)Lp=(uH)Ip=(A)Np=()Ae=(cm2)B(max)TDKFerriteCorePC40100B(max)3900Gauss3000~3500GausspowerAdapter()3000GaussAePower2.4.2:Vin(min)Vin(win)Power2.4.3:2/14BobbinBobbin6A/mm22.4.4:0.50.5xDVinDxVVoNpNsD(min))1()(NS=NP=Vo=VD=Vin(min)=D=2.4.5Ip:IpIp(min)*PoutIavVin2*max1IavDIpKIp=Iav=Pout=K=Ip2.4.6LpIpKIfTonLp*VinTonLpILp=Ton=I=2.4.7NpNs3/14GaussxNpxAeLpxIpB100(max)*max*LpIpNpBAexDVinDxVVoNpNsD(min))1()(Ns2.4.8:NsVoVcc*VccNsNvccVo2.4.9CRS10-05:66160Vdc10.6W(5.3V/2A)K=0.3Dmax=0.42=0.8f=200KHzT=5us:FEY12.8Ae11.4mm2Ip10.60.201(min)*66*0.8PoutIavAVinIpK0.32*2*0.201max0.420.736110.3IavDIpAKLpIpKI=Ip*1-K=0.736*1-0.3=0.515A*66*5*0.422690.515VinTonLpuHI*269*0.73657.9max*0.3*11.4LpIpNpBAe58xDVinDxVVoNpNsD(min))1()(Ns6.797Bmax:4/14Vcc=12V*12*7155.30.3VccNsNvccVo2.5:2.5.1FS1:IinIin(0.42A)2A/250VPin(max)Iin2.5.2TR1():C1()IinPowerIinSpec(115V/30A230V/60A)()SCK053(3A/5)C1(Power)2.5.3VDR1():PowerAC(Fuse)Power(07D471K)2.5.4CY1CY2(Y-Cap):Y-CapY1Y2ACInputFG(3Pin)Y2-CapACInput2Pin(LN)Y1-CapY1Y2(Y1)(Y1Y2Y1)FGY2-CapY-CapEMI(LeakageCurrent)(3Pin750uAmax)2.5.5CX1(X-Cap)RX1:X-CapEMIEMI(EN55022)ClassAClassB150K~30MHz30MH~1GHz2.5.6LF1():EMIEMI()EMI5/142.5.7BD1():ACDCIin1A/600V600V2.5.8C1():C1()Vin(min)Vin(min)Vin(min)ACInput90V~132V(Vc1190V)200V;ACInput90V~264V(180V~264V)Vc1380V400V2.5.9D2():2.5.10R10():PWMICVCC3843VCC8.4V(Min.Load)VCC()2.5.11C7():PWMIC100uf/25V2.5.12Z1(Zener):3843VCC3843Pin3ZenerDiodeZenerDiodePin31V.Z1Z1Q1VGS(1/2W).2.5.13R2():3843R2C73843VCCR2turnonPinR2turnonPin220K/2WM.O.2.5.14R4(LineCompensation):3843Pin390V/47Hz264V/63Hz(750K~1.5M1/4W)2.5.15R3C6D1(Snubber):6/14SnubberSnubber:1.Q1offSpikeSnubberSpikeQ12.SnubberEMI.D11N4007(1A/1000V)EMI.R32WM.O.C6(500V)2.5.16Q1(N-MOS):3A/600V6A/600V6A/600VRDS(ON)3A/600VIDS3A3A/600V6A/600V3A/600VQ1VDS2.5.17R8:R8Q1Q12.5.18R7(Rs):3843Pin31VR7R42WM.O.R7R43843Pin30.85V~0.95V(1V1V)2.5.19R5C3(RCfilter):3843Pin3R51K1/8WC3102P/50VC3(3843Pin31V);Pin2.5.20R9(Q1Gate):R9EMIQ1turnon/turnoffEMIQ1(turnoff);Q1turnon/turnoffQ1EMI51-1501/8W2.5.21R6C4():3843DataSheetRCC410nf(5%)R6DA-14B33C4103P/50VPER63.74K1/8W45KHz2.5.22C5:RCfilter7/14101P/50V2.5.23U1(PWMIC):3843PWMICPhotoCoupler(U2)DutyCyclePin3(1V)3843KA3843(SAMSUNG)UC3843BN(S.T.)UC3843BNKA38432KHzfT(:EMI)KA3843UC3843BN2.5.24R1R11R12C2():3843ErrorAMP()R1R11R12C2ErrorAMPC2()2.5.25U2(Photocoupler)(Photocoupler)()TL431U23843Pin6(output)off(Low)Q1Photocoupler(primacytosecondary5.6mm)2.5.26R13():PhotocouplerR13PhotocouplerU2()R13PhotocouplerU22.5.27U3(TL431)R15R16R1816//151816//13RRRRRxVrefVo38V(TL431VKA36VPhotocouplerVFVo38V)TL431Vref2.5VR15R16R15R16(2K)2.5.28R14C9():8/14Dynamicload2.5.29D4():3.3V(OutputVoltageRegulator)TL431(Vref=2.5V)TL432(Vref=1.25V)PhotocouplerTL431U2U3(10mA)100V1N4148(0.15A/100V)2.5.30C8():U2U31u/50V2.5.31D5():D5:a.b.DA-14B334A10A(Schottky)D515A10AVF15AVF40V15A/40VSchottky2.5.32C10R17(snubber):D5spikespike(D5)snubberspikeEMIR171/2WC10500Vsnubber(264V/63Hz)R17,C102.5.33C11C13():(LXZYXA:a.Rippleb.c.2.5.34R19():()2.5.35L3C12(LC):LCL3()C123:()a.b.3.1DA-14B33()3.1.1:3.1.1.13843PIN3(fullload4A):90V/47Hz=0.83V115V/60Hz=0.83V132V/60Hz=0.83V180V/60Hz=0.86V230V/60Hz=0.88V264V/63Hz=0.91V3.1.1.2DutyCycle,fT:%5.4735.2115.108.4647/90CycleDutyusTustonKHzfHzVT%2.1535.2125.38.4660/264CycleDutyustustonKHzfHzVT3.1.1.3Vin(min)=100V(90V/47Hzfullload)3.1.1.4Stress(264V/63Hzfullload):Q1MOSFET:D5:10/14D4:3.1.1.5()Pinmax.:.)(max2.1)4(26.11)0.18A(8.4V47/90WAVHzV.)(max8.8)4(26.11)0.13A(8.4V63/264WAVHzV3.1.1.6Static(fullload)Pin(w)Iin(A)Iout(A)Vout(V)P.F.Ripple(mV)Pout(w)eff90V/47Hz18.70.3643.300.573213.2270.7115V/60Hz18.60..3143.300.522813.2271.1132V/60Hz18.60.2843.300.502913.2271.1180V/60Hz18.70.2143.300.493013.2370.7230V/60Hz18.90.1843.300.462913.2269.9264V/60Hz19.20.1643.300.452913.2368.93.1.1.7FullRange(0.3A-4A)()3.1.1.8()90V/47HzVout=8.3V264V/63HzVout=6.03V3.1.1.9O.C.P.()90V/47Hz=7.2A264V/63Hz=8.4A90V/47Hz=OK115V/60Hz=OK132V/60Hz=OK180V/60Hz=OK230V/60Hz=OK264V/63Hz=OK11/143.1.1.10Pin(max.)90V/47Hz=24.9W264V/63Hz=27.1W3.1.1.11DynamictestH=4At1=25msslewRate=0.8A/ms(Rise)L=0.3At2=25msslewRate=0.8A/ms(Full)90V/47Hz264V/63Hz3.1.1.12HI-POTtest:HI-POTtest:3Pin(FG)HI-POTtest1500Vac/1minuteY-CAPY2-CAP2Pin(FG)HI-POTtest3000Vac/1minuteY-CAPY1-CAPDA-14B333PINHI-POTtest1500Vac/1minute3.1.1.13Groundingtest:3Pin(FG)(Groundingtest)FG()100m(25A/3Second)12/143.1.1.14()EMIEMID5BYV118(10A/40VSchottky)PBYR1540CTX(15A/40V)3.1.1.15EMI:EMI:Conduction()Radiation()(FCC:450K-30MHzCISPR22:150K-30MHz)(30M-300MHzConductionRadiation)3.1.1.16::PCB3.1.2:EMI()()13/14