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时间: 2019-12-27 21:05
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Thedensityofportableelectronicequipmentrequiresthedesignengineertopayparticularattentiontoanumberofimportantdesignparameters.Forthepowerconversioncircuitry,twooftheseparametersaretheefficiencyandthetotalcircuitryfootprint.Keepingtheefficiencyhighextendsbatterylifeandcontrolsthetemperatureriseoftheequipment.LimitingthecircuitryfootprinthelpsminimizethesizeofthePrintedCircuitBoard(PCB)and,ultimately,thetotalcostofthedevice.TheMCP1612isanidealchoiceforsuchadesign.SinceboththeswitchingandsynchronousMOSFETsareinternalandswitchingis1.4MHz,theinductor,inputandoutputcapacitorsizeisminimized.Theoutputvoltageissetbyusingasimpleresistordivider,withahigh-bandwidthloopbeingaccomplishedbyaseriesresistorcapacitortoground.Efficienciesof90%andatypicalshutdowncurrentof0.01µAhelptoextendbatterylife.ThisApplicationNotecontainsalloftheinformationneededtodesignasynchronousbuckconverterusingtheMCP1612.Italsocontainsareal-worlddesignexamplewithmeasuredlaboratorydata.AN968SimpleSynchronousBuckConverterDesign-MCP1612Author:CliffEllisonSolvingthestandardinductorequationforinductorMicrochipTechnologyInc.ripplecurrent(IL)yields:VLIL=------×TLINTRODUCTION……