第1页共12页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第1页共12页更多企业学院：《中小企业管理全能版》183套讲座+89700份资料《总经理、高层管理》49套讲座+16388份资料《中层管理学院》46套讲座+6020份资料《国学智慧、易经》46套讲座《人力资源学院》56套讲座+27123份资料《各阶段员工培训学院》77套讲座+324份资料《员工管理企业学院》67套讲座+8720份资料《工厂生产管理学院》52套讲座+13920份资料《财务管理学院》53套讲座+17945份资料《销售经理学院》56套讲座+14350份资料《销售人员培训学院》72套讲座+4879份资料第2页共12页第1页共12页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第2页共12页更多企业学院：《中小企业管理全能版》183套讲座+89700份资料《总经理、高层管理》49套讲座+16388份资料《中层管理学院》46套讲座+6020份资料《国学智慧、易经》46套讲座《人力资源学院》56套讲座+27123份资料《各阶段员工培训学院》77套讲座+324份资料《员工管理企业学院》67套讲座+8720份资料《工厂生产管理学院》52套讲座+13920份资料《财务管理学院》53套讲座+17945份资料《销售经理学院》56套讲座+14350份资料《销售人员培训学院》72套讲座+4879份资料ImprovementsinBatteryChargerICsKeepPacewithRapidIncreasesinMobileHandsetCapabilitiesIntheeraofglobalwirelessconnectivity,almostnothingismoreimportantthankeepingasmartphoneormobileInternetdevicecharged.ExpandingfeaturesontheconstantlyimprovingportableandhandhelddevicecreateamajorchallengefordesignersofbatterychargerICs.Highresolutionscreensandlargermemoriescombinewithnewcapabilitiestotaxthebattery,requiringbatterychargertechnologythatisnotonlymoreefficientbutalsocapableofmanagingpowerdistribution.第3页共12页第2页共12页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第3页共12页Optimizingpowerconsumptiontoprolongbatterylifehasalwaysbeenadrivingforceinhandheldpowermanagement.Howeverwhatischangingaretheefficiencyexpectationsforcharginghandhelddeviceswhentheyarepluggedintothewall.Thelatestgenerationsofdevicedesignsareusinghigh-efficiencyswitchingchargersinplaceoftraditionallinearchargers.Customerstodaycontinuetodemandshorterchargecycleswhenchargingtheirbattery.Besidehigherefficiencywithrespecttotheconventionallinearchargers,oneofthegreatadvantagesofusingswitchingchargerssolutionisthecapabilitytoboostthechargecurrentfromwhatsuppliedbythesource.ThisisespeciallyimportantwhenpoweringoffofaUSBportwherethecurrentavailablemightbelimitedtolessthan500mA.Higherchargecurrentsequatetoshorterchargecyclesthussatisfyingcustomerexpectations.Therearetwokindsofbatterychargersusedinmosthandheldsnow–linearchargersandswitchingdevices.Linearchargershavealongerhistory.Theyhavetypicallyprovidedarelativelyefficient,simplewaytochargeportabledevices,creatingminimalnoisewithoutmanyexternalcomponents.Butasportabledevicesbecomemorecomplexandaddlayersofnewfeatures,theyneedhigherbatterycapacity.Linearchargerspresentliabilitiesduetopowerdissipation,whichbecomeclearifauserwantstochargeadevicewhileusingatthesametime.Theheatgeneratedwhilesimultaneouslyusingandchargingcandamagethesystemorbattery.Notagoodoutcome.Thealternativeisaswitchingdevice,orswitchmodebatterychargerIC,thatcandeliverhighercurrentlevelstoabatterywhilerequiringaslittlepoweraspossible.Historically,therehavebeensomenoiseissueswiththesekindsofICs.Inaddition,someearlygenerationsofswitchmodedeviceshaverequiredseveralexternalcomponents.However,thebenefitsoftheswitchedmodebatterytopologyareclear.Theyincludehigherefficiencyandlowerp...
