LDO线性稳压器提高白光LED亮度匹配

摘要：一个简单的，传统方法与固定偏置电压和镇流电阻在穷人之间的LED匹配的亮度白色发光二极管（LED）供电。这是由于宽的LED正向电压的变化，有时低至1V。一种廉价的LDO线性稳压器可以提高240％亮度匹配的LED正向电压调节LED电流和偏压。

Maxim>AppNotes>DISPLAYDRIVERSPOWER-SUPPLYCIRCUITSKeywords:whiteLEDs,linearregulators,LDO,dc-dcconverters,ballasting,ballastresistorsMar27,2002APPLICATIONNOTE1020LDOLinearRegulatorImprovesWhiteLEDBrightnessMatchingAbstract:Asimple,traditionalmethodofpoweringwhitelight-emitting-diodes(LEDs)withfixedbiasvoltageandballastresistorsresultinpoorbrightnessmatchingbetweenLEDs.ThisisduetowideLEDforwardvoltagevariation,sometimesasmuchas1V.AninexpensiveLDOlinearregulatorcanimprovebrightnessmatchingby240%byregulatingbothLEDcurrentandbiasvoltageinresponsetotheforwardvoltageofoneoftheLEDs.Sincetheirinventionafewyearsago,whitelight-emitting-diodes(LEDs)havebeensteadilygaini