白光LED驱动翻盖手机

摘要：开关转换器集成电路设计为白光LED驱动器和一个模拟开关控制LED照明在移动手机（翻盖）三种形式。

Maxim>AppNotes>SWITCHESANDMULTIPLEXERSKeywords:mobilephones,clamshellphones,whiteLEDs,keyboardilluminationSep23,2005APPLICATIONNOTE3624DrivingWhiteLEDsinClamshellPhonesAbstract:Aswitching-converterIC―designedasawhite-LEDdriver―andananalogswitchcontrolthreeformsofLEDilluminationinamobile(clamshell)phone.ThiscircuitmultiplexesthedrivetothreesetsofLEDsfoundinsideclamshellphones.Thesephonesusuallyhaveanexternaldisplaythatisilluminatedwhenanincomingtelephonecalloccurs.Oncetheclamshellisopened,theexternaldisplayilluminationisswitchedoffandthemaininternaldisplayandkeyboardilluminationareactivated.ThecircuitinFigure1isbasedaroundtheMAX1848(IC1)whiteLEDdr