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Basic Calculation of a Buck Converter ... - Texas Instruments

(max)VMaximum Duty Cycle: D =V OUTINVINVOUTIINIOUTCINCOUTLDSWA pplicationReportSLVA477B December2011 RevisedAugust2015 BasicCalculationof a BuckConverter's PowerDC/DCApplicationsABSTRACTT hisapplicationreportgivesthe formulasto calculatethe powerstageof a buckconverterbuiltwith anintegratedcircuithavinga integratedswitchandoperatingin is notintendedto givedetailson the functionalityof a buckconverteror howto compensatea ,see the referencesat the end of this containsthe a BuckConverterFigure1 showsthe basicconfigurationof a buckconverterwherethe switchis integratedin the selectedintegratedcircuit( IC). Someconvertershavethe diodereplacedby a secondswitchintegratedinto theconverter(synchronousconverters).If this is the case,all equationsin this documentapplybesidesthepowerdissipatione quationof the the PowerStageThe followingfour parametersare neededto calculatethe powerstage:1.

I 100 IR1/2 FB³ ´ R 1 R 2 IR1/2 IFB V OUT V FB P = I VD F F´ I = IF OUT(max) ´ -(1 )D!I = (0.2 to 0.4) IL OUT(max)´ www.ti.com Rectifier Diode Selection VIN = typical input voltage VOUT = desired output voltage fS = minimum switching frequency of the converter ΔIL = estimated inductor ripple current, see the following: The inductor ripple current cannot be calculated with …

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