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降压型高功率LED驱动器

上传者: 2022-06-23 22:19:09上传 PDF文件 349.87 KB 热度 0次

Thecircuitandfirmwaredescribedinthisapplication

notedemonstratesaminimalpartscountdriver/control-

lerforahigh-power(1Worgreater)LED.Thecircuitis

basedonabucktopologyswitchingpowersupply

usingtheon-chipcomparatorperipheralwithinthe

PIC12F675PIC

®

microcontroller.Theswitchingpower

supplydesignensuresefficientpowertransferbetween

thesystembatteryandtheoutputLED.

TheFlashPICmicrocontrollerisusedtoimplement

intensitycontrol,automatedintensitycompensationfor

lowbatteryconditions,andtheabilitytoplaybackpre-

programmedFlashsequences.TheFlashPICmicro-

controlleralsoallowsthecreationofacustomPC-

basedgraphicaluserinterface,usingthePICkit™1

FlashStarterKitforprogrammingthepre-programmed

Flashsequences.Thecombinationoftheswitching

powersupplydesignandthemicrocontrollerresultsin

anefficientcircuitwithadvancedautomatedfeatures

whilekeepingthecircuitsimpleandinexpensive.AN874BuckConfigurationHigh-PowerLEDDriverVoltageandCurrentAuthor:KeithCurtisMicrochipTechnologyInc.The1wattchosenmodulerequiresatypicaldriveof3.4Vat350mAtoproduceitsfulloutputbrightness.Themaximumcurrentdrivefortheunitis500mA.INTRODUCTIONExceedingthemaximumcurrentspecificationforthemodule,evenbyshortdurati

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