标签: dc控制器

Inmanyapplications,aDC/DCConverterisusedtoproducearegulatedvoltageorcurrent,derivedfromanunregulatedpowersupply,orfromabattery.Examplesoftheseapplicationsincludebatterychargers,elec-tronicairpurifiers,emergencyexitsigns,anddistrib-utedpowersystems.Insomeofthoseapplications,adedicatedSwitchedModePowerSupply(SMPS)ControllerICisusedinconjunctionwithamicrocontroller.Inotherapplica-tions,however,adedicatedSMPSControllerICmaybeoverkill.AnalternativeapproachistogeneratealowcostSMPSfunctioninasmartmicrocontroller,suchasthePIC16C620A.ThisApplicationNoteshowsamethodofusingthemicrocontrollertoperformsimpleSMPScontrolfunctions.Twocircuitswerebuiltforevaluation.Onecircuitpro-videsaConstantVoltageoutput,theotheraConstantCurrentoutput.AN216DC/DCConverterControllerUsingaPICmicroMicrocontrollerInanytypeofDC/DCConvertercircuit,thepowerAuthor:HartonoDarmawaskitadeviceselectionsareveryimportant.Thekeyparame-MicrochipTechnologyInc.terstolookforinthetransistorQ1aretheswitchingtimeandcurrentrating.Thesetwoparametersgreatlyaffectthemaximumswitchingfrequencyofthecon-……