一種pfm控制的低功耗acdc電源管理芯片設(shè)計

1、東南大學(xué)碩士學(xué)位論文一種PFM控制的低功耗ACDC電源管理芯片設(shè)計姓名：謝正開申請學(xué)位級別：碩士專業(yè)：集成電路設(shè)計指導(dǎo)教師：常昌遠(yuǎn)20090417ABSTRACTABSTRACTNowmoreandmoreelectronicproductsareportableandmultifunctional，whichmaketheAC／DCconvertersmusthavespecialproperties，suchashigheffici

2、encylowpowersmallboardspaceandlowcostHowtoimprovetheefficiencyandpowerconsumptiontoprolongthebatterylifeanddecreasethecostwhichistheprimaryconsiderationinAC／DCconverterdesignsAmethodthatdesignsahighefficiencylow—powerswi

3、tchingpowerAC／DCconvenerwithpulsefrequencymodulation(PFM)modeispresentedWhentheloadcurrentislarge，theconverteropermesinthevoltagecontrolbasedPFMmode，andmodulatestheswitchingfrequencyaccordingtothechangeoftheloadcurrent，i

4、nordertosteadytheoutputvoltageWhentheloadcurrentsmall，theswitchingfrequencysmall(1essthan16kHzapproximately)andthefeedbackvoltagetoohi曲，theconveneroperatesinthevoltagecontrolbasepulseskippingmodeandentersthesleepstatus50

5、thatitCandecreasepowerThechipisimplementedusingASMC12pmBiCMOSprocessThesimulationresultsindicatethattheconvertercalloperateinPFMandpulseskippingmode，alsoitcanperformseamlessswitchingbetweenthem，displayinggoodload／linereg

6、ulmionStartupcurrentlessthan9釁，thequiescentcurrentlessthan600pAandsleepmodepowerlessthan200mWFirstofall，thewholechipfunctiondiagramisdesignedafteranalyzingtheprincipleofPFMAC／DCconvenerandthesystemrequiredfunctionAndthen

7、，thesubblockcircuitisdesignedaccordingtothewholechipfunctionandstructureInsub—blockcircuitsection，thetypicalcircuitsincludingreferenceblock，startupblockcurrentlimitblockCVblockCCblockandprotectblockareintroducedThebasicp

8、rincipleofeverysubblockcircuitsisnotedandthesimulmionresultisgivenattheendofeachsegmentBasedontheprincipleanalysisofthewholechipanddesignedofthesubblockcircuit，thewholechipsimulationresultsdonebycadencet001Finallythelayo