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DesignSpreadsheetfortheMC33063deviceinstepuptopology:Selectpackage,demoboard:SOICFALSETRUEFALSEPackagePDIPSOICDFNCustomRthja(°C/W)1071234790RelatedtomentionedPCBTmax(°C)150150150150Pdmax(W)0.950.6251.20.6251230.625PCBone-layer,size:28x41mm,35umcopperthickness,840sqmmcopperareaRESULTS:Tamax:114.89°C<--MaximumambienttemperaturePd:0.29W<--PowerDissipationatthedeviceThemaximumambienttemperatureisrelatedtoone-layerPCBwithparametersmentionedbelowyellowtable.ThevalueofmaximumambienttemperatureiscalculatedformaximumallowablejunctiontemperatureTj=150°C.1)InsertDesignParameters=InputParameter=CalculatedParameter(DONOTCHANGE)=WarningUnitScrollBarsforfastVinandVoutsetting:VIN12V<--WorstCaseInputVoltage(minimumVin)InputVoltage:2.5V<Vin<38VVOUT28V<--DesiredoutputvoltageNote:(Vin+2)<Vout<40VIOUT0.175A<--DesiredoutputcurrentD60%<--DutyCycle.MaximumdutycycleoftheMC30063is84%600.4E-313.42)InputConductionLossParametersfromFree-wheelingDiodeDatasheetsUnitVF0.6V<--DiodeForwardVoltage(Example:1N5819=0.6V)VSAT0.9V<--SaturationVoltageofPowerSwitchTransistor-FoundinElectricalCharacteristicsofDatasheet,DarlingtonConfiguration3)SetDIL/IL(avg)ForMaximumOutputCurrentitissuggestedthatΔILshouldbechosentobelessthan10%oftheaverageinductorcurrent,IL(avg).ThiswillhelppreventIpk(sw)fromreachingthecurrentlimitthresholdsetbyRSC.Ifthedesigngoalistouseaminimuminductancevalue,letΔIL=2*IL(avg).Thiswillproportionallyreduceoutputcurrentcapability.UnitDIL/IL(avg)15%<--DIL/IL(avg)Iripple0.07A<--RippleCurrent,DIL4)InputtargetfrequencyUnitTargetf50kHz<--Targetedmaximumswitchingfrequency5.00E+04Timingcapacitor480.2893309nF<--TimingcapacitorcapacitanceNO5)ThespreadsheetcalculateskeyparametersfortheremainingcomponentselectionUnitton/toff1.50ton12.01us12.0E-6IL(avg)0.44A<--AverageInductorCurrent.Ipk(sw)0.47A<--PeakInductorCurrent.ForBoostConverterthisequalsIL(avg)+Iripple/2UnitRSC637mOhm<--MinimumShortCircuitResistorValue637.3E-3L2029uH<--Minimuminductancevalue-increasinginductancedecreasesripplecurrent2.0E-3RL0.086O
