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1PCB(,200021):PCBPCBPCBPCBPCBBasicPCBLayoutGuidelinesforOnBoardPowerSupplyDevelopmentChenZhouSemtechInternationalAG,ShanghaiAbstract:PCBlayoutofonboardpowersupplyisoneofthemostcriticaltasksofaproductdesigner.Inmanycases,awelldesignedpowersupplyonpapermayturnouttobeunworkableduetopoorPCBlayout.Inthispaper,basicguidelinesofpowersupplyPCBlayoutarepresented.Severalpracticalpowersupplylayoutexamplesareexplainedindetail.Keywords:PCBlayout,powersupply1.ACDCPCB1PCBPCBPCBPCBPCBVINR72.2RC131800uF/6.3VR85.1RR102.2RC121800uF/6.3VC154.7uF/16VC84.7uFC111800uF/6.3VQ2IPD09N03C91uFR92.2RR31.5KC104.7uFR61.5KR51KC11800uF/16VQ1IPD09N03R10RD2D1N4148C31uFC447nFC21800uF/16VR41kL12uHC51nFU1SC110413245678COMP/SSDLGNDDHBSTPHASEVCCSENSEC61nFC141nVOUTD1D1N4148112V,3.3V,15A)2.PCB2.1222dAC0rεε=(d)(A)(ESR)(L)3(ZC)3(ZC)(f0)(C)(L):LC21f0π=f0,fC2j1ZCπ−=f0,:fL2jZCπ=f0,(ESR)445PCB(VIN)(RL)ESL,VINRLVINRL#1,35PCB(a)(b)2.26B(t)6mC0lALµ=(AC)(lm)(L)(ESR)(CP)7(ZL)7(ZL)(f0)(L)(CP):P0LC21fπ=f0,fL2jZLπ=f0,:fC2j1ZLπ−=f0,(ESR)(CP)(CP)8488(CP)(C)8#4#5#1#2#3#1#5(CP)(C)9PCB(VIN)(RL)CP,VINRLVINRL9PCB(a)(b)2.3PCB1010(a)(b)10(a)10(b)11#251111PCB(GroundPlane)2.412122.5PCB(VIAS)13131414(Decouple)ESLPCB15#5#4#36152.616162.7(Analog)(Digital)PCBPCB17173.PCB1181PWMC131800uF/6.3VR85.1RR102.2RVINC121800uF/6.3VC154.7uF/16VC84.7uFQ2IPD09N03C111800uF/6.3VC91uFR92.2RR31.5KC104.7uFR61.5KVOUTR51KC11800uF/16VQ1IPD09N03C31uFD2D1N4148R10RC21800uF/16VR41kC447nFL12uHC51nFU1SC110413245678COMP/SSDLGNDDHBSTPHASEVCCSENSEC141nC61nFD1D1N4148R72.2R18()()#673.1PCBPCB19(#1)(CIN),(Q1)(Q2)(#2)(Q2),(L),(COUT)#1#2#119PCB20PCB2020PCB,(CIN)(ESL)CIN#1#2(L)(CP),(COUT)(ESL)21PCB#1#2(Q1)(Q2)(L)Q1Q2L(L)(COUT)PCB213.2PCBPCBVCC(GND)(22)8223.3PCB123(1)PCB12V3.3V15APWM(SemtechSC1104)PCBPCB23PCB()(PCB)(C1,C2),(Q1),(Q2),(L1),(C10,C11,C12,C13),(PCB)(SC1104A)PCBPCB3.4PCB22412V3.3V3A(SemtechSC4519)DVDADSL+3.3VR44.7kVout12C5100pF+12VEN12C41.5nFC10.22uFC310uFD2C210uFSC451912345678BSTINSWGNDENFBCOMPSYNCSYNC12L16.8uHD31N4148R29.31KVin12R00R34.7KR116.9K24(12V,3.3V/2.5A)PCB1)(C3),(SC4519)(GND),(D2)C3D2SC45192)(VIN),(VOUT),(C3),(C2),(D2),(SC4519)(R1,R2),(R3,C4,C5),(EN),(SYNC)3)(SC4519)(#4)(VIA)VINR72.2RC131800uF/6.3VR85.1RR102.2RC121800uF/6.3VC154.7uF/16VC84.7uFC111800uF/6.3VQ2IPD09N03C91uFR92.2RR31.5KC104.7uFR61.5KR51KC11800uF/16VQ1IPD09N03R10RD2D1N4148C31uFC447nFC21800uF/16VR41kL12uHC51nFU1SC110413245678COMP/SSDLGNDDHBSTPHASEVCCSENSEC61nFC141nVOUTD1D1N4148#7925PCB(VIN)PCB,(VOUT)PCB(L1)PCB,(R3,C4,C5)PCBD2(SC4519)26PCB(C3)PCB(SC4519)25SC4519PCB2726SC4519PCB3.4PCB3PCB12V5V3.3V,2.6V,1.8V,1.2V(SemtechSC2453)SC24534.5V30V700KHz15A0.5VTSSOP-2827+12VinR112Q2-1FDS6898A4536R2215KC130.1uFR2120KR1820KR428.0KC210uF/6.3VC110uF/6.3VC31uF+5VinC161nFR1528.0KR132C17100uF/6.3VR1210KTP3C1410uFR32D21N5819HW+1.2V/3AD11N5819HWQ1-1FDS6898A4536R1042.2KC191uFC1247pFR17750R94.99KC1010uFTP2C8100uF/6.3VC92.2nFSC2453U123242512269715320241319181752814272111110221668GD1LPH1GD1HEO2BST1OSCSYNCAGNDEO1GD2LFB1BD4FB2PH2GD2HBST2FB4BDIILIM2VINPGNDILIM1BD3FB3PVCCAVCCSS/SDPOKQ3FZT749C242.2nF+1.8V/0.1AR213KC2247pFC71.5nFL115uHR6750Q2-2FDS6898A+3.3VinConnectboththepowergroundandcontrolgroundatU1pin21L210uH+3.3V/3AC60.1uFR2020KU2SC156314236578INOUTSHDNADJGNDGNDGNDGNDR52C50.1uFC151uFR110C40.1uFC113.9nFR820KC2110uF/16VQ1-2FDS6898A+2.5V/1AC18100pFR71K103.3V5V,1.2V12V,2.6V1.8V3.3VPCB27(SC2453)(SC245321)283028SC245329SC245330SC24534.PCB1),2)3)4)5)6)7)8)#811[1]Schmitt,Ron.ElectromagneticsExplained.[2]Fluke,John.ControllingConductedEmissionsByDesign.[3]Montrose,Mark.EMCandthePrintedCircuitBoard:Design,Theory,andLayoutMadeSimple.[4]Erickson,RobertW.SupplementaryNotesonEMIandLayoutFundamentalsforSwitched-ModeCircuits.[5]Novak,Istvan.PoweringDigitalBoards,DistributionandPerformance.[5]SC1104Datasheet.SemtechInternationalAG.[6]SC4519Datasheet.SemtechInternationalAG.[7]SC2453Datasheet.SemtechInternationalAG.
本文标题:开关电源PCB排版基本要点
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