一种DC-DC全区间分段线性斜坡补偿电路设计

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1、万方数据第29卷第2期半导体学报V01．29No．22008年2月JOURNALOFSEMICONDUCTORSFeb．，2008：—=—————————=—————；——————=；——————=—————亍=—————=———。2—2————2—52。—。——。2——。—4APiecewiseLinearSlopeCompensationCircuitforDC—DCConverters。YeQiang+，LaiXinquan，LiYanming，YuanBing，andChenFuji(InstituteofElectronicCAD．XidianUniversi

2、ty，Xi’an710071，China)Abstract：Topreventsub-harmonicoscillationandimprovethestabilityandloadcapacityofthesystem，apiecewiseIinearslopecompensationcircuitisdesigned．Comparedwiththetraditionaldesign，thiscircuitprovidesacompensationsignalwhoseslopevariesfromdifferentdutycyclesat一40～85℃，andred

3、ucesthenegativeeffectofslopecompensationonthesystem'sloadcapacityandtransientresponse．AcurrentmodePWMBoostDC-DCconverteremployingthisslopecorn·pensationcircuitisimplementedinaUMC0．6“m．BCDprocess．Theresultsindicatethatthecircuitworkswellandeffee-tively，andtheloadcapacityisincreasedby20％。T

4、hechipareaofthepiecewiselinearslopecompensationcircuitls0．Olmm2，whichconsumesonly8肛Aquiescentcurrent，andtheefficiencyrangesupto93％．Keywords：DC．DCconverter；slopecompensation；EEACC：2570P；2570A；2560PCLCnumber：TN433Documentcode：AlIntroductionpiecewiselinear；dutycycleArticleID：0253—4177(2008)

5、02—0281-07InmediumandsmallpowerDC／DCswitchedpowersupplies[¨．thepeakcurrent—modecontrollingtechniqueinconstantfrequencyPWMclosedloopfeedbackcontrollingsystemiswidelyusedtoachievebetterdynamicperformance，higherprecision，largergainbandwidth，andprotectionfromtransientlargecurrent．Forthedutyc

6、ycleD>50％，thereisaninherentopen．100pinstabilityandsub．harmonicoscillationintheconstantfrequencypeakcurrent．modeL20control-lingsystem．Iftheconventionalcompensationthatisstableunderalldutycyclesincludingthemaximumdi／dt(theworstcondition)promisedwiththecon-stantcompensationrateisused，thenit

7、willIeadtoalargeslopecompensationanddamagethetransientresponsecharacteristicandpeakinductorcurrentoftheswitchedpowersupply．Especiallyintheunloadconditions，theexcessivecompensationmaymakethepeakcurrent．modecontroIchangeintothevoltage-modecontrol。whichisunexpected．Therefore