为主导的驱动程序的电源供应

PowerSuppliesforLEDDrivingElsevierUSPLDPrelimsH83411422008Page:1Trim:7.59.25inElsevierUSPLDPrelimsH83411422008Page:2Trim:7.59.25inPowerSuppliesforLEDDrivingSteveWinderAMSTERDAM�BOSTON�HEIDELBERG�LONDONNEWYORK�OXFORD�PARIS�SANDIEGOSANFRANCISCO�SINGAPORE�SYDNEY�TOKYONewnesisanimprintofElsevierElsevierUSPLDPrelimsH83411422008Page:3Trim:7.59.25inNewnesisanimprintofElsevier30CorporateDrive,Suite400,Burlington,MA01803,USALinacreHouse,JordanHill,OxfordOX28DP,UKCopyright2008byElsevierInc.Allrightsreserved.Nopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmittedinanyformorbyanymeans,electronic,mechanical,photocopying,recording,orotherwise,withoutthepriorwrittenpermissionofthepublisher.PermissionsmaybesoughtdirectlyfromElsevier’sScience&TechnologyRightsDepartmentinOxford,UK:phone:(þ44)1865843830,fax:(þ44)1865853333,E-mail:[e-mail]questonlineviatheElsevierhomepage(),byselecting‘‘Support&Contact’’then‘‘CopyrightandPermission’’andthen‘‘ObtainingPermissions.’’Recognizingtheimportanceofpreservingwhathasbeenwritten,Elsevierprintsitsbooksonacid-freepaperwheneverpossible.LibraryofCongressCataloging-in-PublicationDataApplicationsubmittedBritishLibraryCataloguing-in-PublicationDataAcataloguerecordforthisbookisavailablefromtheBritishLibrary.ISBN:978-0-7506-8341-8ForinformationonallNewnespublicationsvisitourWebsiteat||:7.59.25inTableofContentsPreface.....................................................................................................ixChapter1:Introduction................................................................................11.1ObjectivesandGeneralApproach.............................................................11.2DescriptionofContents.............................................................................2Chapter2:CharacteristicsofLEDs................................................................72.1ApplicationsforLEDs...............................................................................82.2LightMeasure..........................................................................................122.3EquivalentCircuittoanLED..................................................................132.4VoltageDropVersusColorandCurrent.................................................142.5CommonMistakes...................................................................................15Chapter3:DrivingLEDs............................................................................173.1VoltageSource.........................................................................................173.2CurrentSource.........................................................................................243.3TestingLEDDrivers................................................................................293.4CommonMistakes...................................................................................303.5Conclusions..............................................................................................31Chapter4:LinearPowerSupplies................................................................334.1Introduction.............................................................................................334.2AdvantagesandDisadvantages................................................................374.3Limitations...............................................................................................374.4CommonErrorsinDesigningLinearLEDDrivers.................................37Chapter5:Buck-BasedLEDDrivers............................................................395.1AnExampleBuckConverterControlIC.................................................405.2BuckCircuitsforDCApplications..........................................................415.3BuckCircuitsforACInput......................................................................46ElsevierUSPLDPrelimsH83411422008Page:5Trim:7.59.25in