资源描述：
《一种基于双极工艺的ldo设计与应用》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、ABSTRACTABSTRACTWiththeimprovementofsemiconductortechnologyandthedevelopmentofportableelectronicdevices,asakindofpowermanagementchip,thelow-dropoutlinearregulator(LDO)withtheadvantagesofsmallnoiseandripples,simplestructureandlowcosthasaconsiderablywidef
2、ieldofapplications.LDOisalsoaneffectivesolutiontotheproblemoflowefficiencyofconventionallinearregulators,andhasalreadybecomemainstreamdirectioninlinearregulatorresearchareas.AnewgenerationofLDOdevelopstowardlowsupplyvoltage,lowpowerconsumption,higheffic
3、iencydirection.ComparedwiththeCMOSprocess,thedeviceadoptingbipolarprocesshastheadvantagesoflowmismatch,higherpowerdensityandasmallerchipsize,andhasasmallerparasiticcapacitancesothatithasabettertransientresponsecharacteristic,andcanalsoprovidegreaterdriv
4、ingcurrent.Bipolarprocessoccupiesacertainpositionwithitsmaturetechnology,highspeedanddrivingability.HighpowerLDObasedonthebipolarprocessisdesigned.Ultra-PNPisusedasadjustingtube,becauseitconsumesrelativelysmallquiescentcurrentresponsingtothehighloadcur
5、rent.Itprovides3.3Voutputvoltage,loadcurrentrangingfrom10mAto5Aand500mVdropoutvoltage.Inaddition,over-temperature,over-currentandover-voltageprotectioncircuitsaredesignedtoensurethatthechipcanworksafely.Over-currentortoolowinputvoltageresultsintheoutput
6、erroridentificationsignal.Thischiphastheadvantagesofhavingasimpleperipheralcircuit,lowpowerconsumptionandhighefficiency.First,thispaperintroducesthebasicconcepts,theworkingprinciples,thekeymodulecircuitstructure,stabilityofthesystemandcompensationmethod
7、s,andthenelaboratesontheperformanceparametersandsystemarchitectureofLDOtoprovideatheoreticalbasisforthespecificcircuitdesign.Inaddition,inaccordancewiththedesignspecificationsofLDO,thebandgapreference,theerroramplifier,thecomparator,theprotectioncircuit
8、andtheadjustingtubeoftheLDOaredesignedandsimulated.LDOsystemfrequencycompensationisⅡ万方数据ABSTRACTdiscussed,analyzedanddesigned,andsystemloopstabilityisverifiedbysimulation,aswellastheoutputaccuracy,quiescentcurrentandconversioneff
