PWM调光的高亮度发光二极管（ HB LED）的直流电压控制

摘要：此LED驱动电路包括迟滞控制器U1（MAX16820的），相关功率元件和控制电路的基础上的四运放U2（LMX324）。U1驱动从24V源5个高亮度发光二极管，使用唯一的电感L1，MOSFETQ1的，赶上二极管D1。

Maxim>AppNotes>DisplayDriversLEDLightingKeywords:high-brightnessLEDs,HBLEDs,hystereticcontrollers,LEDdrivers,temperature-basedcurrentfoldbackNov19,2010APPLICATIONNOTE4509DCVoltageControlsPWMDimmingofHigh-BrightnessLEDs(HBLEDs)Abstract:ThisLED-drivercircuitincludesahystereticcontrollerU1(MAX16820),relatedpowercomponents,andacontrolcircuitbasedonthequadopampU2(LMX324).U1drivesfiveHBLEDsfroma24Vsource,usingonlyinductorL1,MOSFETQ1,andcatchdiodeD1.AsimilarversionofthisarticleappearedintheJune24,2008issueofElectronicDesignmagazine.High-brightnessLEDs(HBLEDs)aremakinginroadsintothemoretraditionallightingthatincludesaDCdistributionsystem(anexampleisthe24VMR-16trackli