基于自适应恒定导通时间的高效率buck型dc-dc设计

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1、东南大学工程硕士学位论文ⅡAbstractToday，electronicequipmentisfacedwiththesituationofpowerbudgetandvolumecontraction．Whichputforwardhigherrequirementsofvoltageregulationability，efficiency，responsespeedandintegrationofpowermanagementchip．Underthistrend，ConstantOnTimecontrolofDC-DChasbecomethefocusofrese

2、archathomeandabroad，becauseofitscharacteristicofsimplestructure，gooddynamicresponseperformanceandhighefficiencyinlightloadcondition．ThispaperintroducesadesignofhighefficiencyBuckDC-DCbasedonadaptiveConstantOnTimecontr01．It’SstructureadoptsthetechnologyoftheAdaptiveConstantOnTimecontr01．Th

3、epowerMOSFET’SOn-Timeisbasedontheinputvoltage，thereferencevoltageandsystemfrequency，whichensurethesystemhasastrongabilityofadaptability．Thispaperhasestablishedthemodelofthemaincontrolloopandthefrequencylockloop．Thencompletetheopen-loopsimulationbyusingMatlab，whichensurethestabilityofthesy

4、stem．InordertOadapttomoreapplicationrequirements，thesystemadoptedtwokindsofworkingmode．OneofthemistheForcedContinuousMode，whichCanrealizelowoutputvoltagerippleandsuitableforthelownoise．AnotheroneisBurstMode，whichCanrealizehilghefficiencyinlightloadbecausethesystemwokeinDiscontinuousCurren

5、tModeandsomepartsenterSleepingMode．ThesimulationandverificationworkofwholedesignbasedonMatlab，Cadence，Hspiceandothertools．ThechiptestresultsshowthatthesystemCanworknormallyandvariousperformanceindexescanmeetthedesignrequirements．TheDC-DCchipisdesignedwithastandardO．35proBCDprocessofKoreaD

6、ongbuHiTek．Themeasuringresultsshowthatthesystemfrequencyisadjustablein800kHz-2．5MHz,theinputvoltagerangeis3．6V～24V，themaximumoutputcurrentis2．5A，thepeakpowerefficiencyCanreach96．1％，itCanworknormallyinbothforcedcontinuousModeandBurstmode．Multipleindexesofthechipcanbeadjusted,usersCanfindth

7、ebestsolutionaccordingtotherequirementsofapplications．ThechipCanbeusedinthesystemsuchashighefficiency，lownoise．Ithasaverywideapplicationprospect．Keywords：ConstantOnTime，BuckDC-DC，ForcedContinuousMode，BurstMode，frequencylocking，mghefficiencyUI东南大学工程硕士学位论文IV目录摘要⋯⋯⋯⋯⋯⋯