高功率白光LED驱动器工作在1或2节碱性电池

摘要：一个DC-DC升压转换器为基础的白光LED驱动器上运行一个或两个碱性电池，电压低至0.8V时开始。

Maxim>AppNotes>DISPLAYDRIVERSPOWER-SUPPLYCIRCUITSKeywords:whiteLEDs,currentsource,stepupconverter,boostconverterMar23,2006APPLICATIONNOTE3755High-PowerWhite-LEDDriverOperateson1or2AlkalineCellsAbstract:Awhite-LEDdriverbasedonaDC-DCstep-upconverteroperatesononeortwoalkalinecells,andstartswithvoltagesaslowas0.8V.Replacingincandescentbulbswithhigh-powerwhiteLEDsyieldshigherreliabilityandgreaterluminousefficiency.AdirectconnectionbetweentheLEDandbattery,however,isnotideal.Comparedwiththealkalinebatteriesusedinmostportableapplications,apowersourceforwhiteLEDsshouldactmorelikeacurrentsourceandofferhigheroperatingvoltages.Itshoul