currentsnot

404notfound是什么意思  时间:2021-02-25  阅读:()
byKentWaltersandBobWernerSchottkyrectifiershavebeenusedforover25yearsinthepowersupplyindustry.
Theprimaryadvantagesareverylowforwardvoltagedropandswitchingspeedsthatapproachzerotimemakingthemidealforoutputstagesofswitchingpowersupplies.
Thislatterfeaturehasalsostimulatedtheiradditionaluseinveryhighfrequencyapplicationsincludingverylowpowerinvolvingsignalandswitchingdioderequirementsoflessthan100picoseconds.
TheserequiresmallSchottkydeviceswithlowcapacitance.
ThereverserecoverytimeofSchottkydiodesareextremelyfast(butsoft)recoverycharacteristics.
Whatlittlereverserecoverytimetheymayexhibitisprimarilydictatedbytheircapacitanceratherthanminoritycarrierrecombinationasinconventionalpnjunctionrectifiers.
ThischaracteristicprovidesverylittlereversecurrentovershootwhenswitchingtheSchottkyfromtheforwardconductingmodetothereverseblockingstate.
Thecombinationofvery"fast-softswitchingproperties"ofaSchottkycanalsoeliminatetheneedforsnubbercircuitsinmanyapplicationsthatmayotherwiseberequiredwithfastorultrafastrectifiersdisplayingabruptrecoverycharacteristics.
Thesefeaturesmakeschottkyrectifiersaveryattractivechoiceforlowparasiticswitchinglosses.
DesignconsiderationswithSchottkydevicesarelimitedinsomeapplicationscomparedtopnjunctionrectifiersbecausetheirreverseleakagecurrentsaremanytimeshigher.
AlsoSchottkyrectifiershavemaximumratedjunctiontemperaturestypicallyintherangeof125°Cto175°C,comparedtothetypical200°Cforconventionalpnjunctionswhichfurtherinfluencesleakagecurrentbehavior.
Forsomeapplications,Schottkydevicesarelimitedinavailablereverseblockingvoltageratingscomparedtoconventionalpnjunctionrectifiers.
Neverthelesswithjudiciousselection,manyapplicationsareoptimizedwithSchottkyrectifiersandtheiruniqueoperatingcharacteristics.
Schottkyrectifiersseldomexceed100voltsintheirworkingpeakreversevoltage(VRWM),sincedevicesmoderatelyabovethisratinglevelwillresultinforwardvoltagesequaltoorgreaterthanequivalentpnjunctionrectifiers.
TheSchottkyrectifierpropertiesdescribedaboveareprimarilydeterminedbythemetalenergybarrierheightofmaterialdepositedonthesiliconbythemanufacturer.
Ametalwithalowenergybarrierheightwillminimizeforwardvoltage,butwillalsoberestrictedinitshightemperatureoperatingcapabilityandhaveveryhighreverseleakagecurrents.
Ahighbarriermetalheightselectionwillminimizetemperatureandleakagecurrentsensitivitybutwillincreasetheforwardvoltage.
Dependingontheapplicationrequirements,thesedesignfeaturescanbeusedasatradeoffinproperchoicewhenselectingaschottkyrectifierusingdifferentbarriermetalsfromamanufacturer.
MicrosemiCorporationoffersavarietyofbarriermetaloptionsonann-epitaxiallayeroveralowresistivitysubstrateforoptimizingparametricperformanceinadditiontoaprotectiveguardringandpassivation.
ThisconfigurationisshowninFigure1.
AreliableschottkyjunctionisdesignedwithapnjunctionguardringtoIntroductiontoSchottkyRectifiersMicroNoteSeries401terminatetheperimeterwithadiffusedpregion.
Thisalsoservesasatransientvoltagesuppressorforreverseenergyabsorptionandover-voltageprotectionincloseproximitytotheSchottkyjunction.
ThisperimeterregioneffectivelyisdrivenintoavalanchebreakdownbeforetheSchottkyisdamagedbyexcessiveamountsofreversecurrentflowandenergyduringtransientevents.
Thevoltage-currentdeviceprotectiverelationisillustratedinFigure2alongwiththetypicalelectricalparametersspecifiedforSchottkyrectifiers.
Insomecases,Schottkyrectifiersarealsospecifiedwithareverseavalancheenergytest.
ThiswillhelpensureasafelevelofoperationinveryfastswitchedapplicationsresultinginhighLdi/dtinductive(suchastransformer)voltagekicksorothersourcesofover-voltagetransientsthatcanbrieflydrivetheSchottkybeyonditsmaximumratedVRWM.
Insuchapplications,thesespecialreverseenergyrequirementsshouldberequestedforadditionalscreeningbytheuserwhennototherwisespecified.
MicrosemiCorporateApplicationsKentWalters(602)941-6300SchottkyBarrierMetalFigure1VerticalstructureofSchottkyRectifierDieReverseVoltageVBRForwardVoltageReverseCurrentAvalancheofpnjunctionSchottkywithoutguardringVRWMSchottkyJunction25°C100°Cto150°CForwardCurrentFigure2SchottkyVoltage-CurrentCharacteristicsandTypicalParametersPARAMETERSSPECIFIEDAT25°CVFForwardVoltageatIFIFForwardCurrentVRWMWorkingPeakReverseVoltageIFSMForwardSurgeCurrentMaximum(Specifiednon-repetitive8.
3ms,1/2sine)IRMaximumLeakageCurrentatVRWMVBRNotSpecified(Typically20%to30%higherthanVRWM)IRatVRWM25°CIRatVRWM100to150°CIFVFatIFSeries401SchottkyRectifiersSiO2PassivationFrontMetaln+substraten-epilayerGuardringBackMetal

hostkey荷兰/俄罗斯机房,GPU服务器

hostkey应该不用说大家都是比较熟悉的荷兰服务器品牌商家,主打荷兰、俄罗斯机房的独立服务器,包括常规服务器、AMD和Intel I9高频服务器、GPU服务器、高防服务器;当然,美国服务器也有,在纽约机房!官方网站:https://hostkey.com/gpu-dedicated-servers/比特币、信用卡、PayPal、支付宝、webmoney都可以付款!CPU类型AMD Ryzen9 ...

提速啦香港独立物理服务器E3 16G 20M 5IP 299元

提速啦(www.tisula.com)是赣州王成璟网络科技有限公司旗下云服务器品牌,目前拥有在籍员工40人左右,社保在籍员工30人+,是正规的国内拥有IDC ICP ISP CDN 云牌照资质商家,2018-2021年连续4年获得CTG机房顶级金牌代理商荣誉 2021年赣州市于都县创业大赛三等奖,2020年于都电子商务示范企业,2021年于都县电子商务融合推广大使。资源优势介绍:Ceranetwo...

SugarHosts糖果主机商更换域名

昨天,遇到一个网友客户告知他的网站无法访问需要帮他检查到底是什么问题。这个同学的网站是我帮他搭建的,于是我先PING看到他的网站是不通的,开始以为是服务器是不是出现故障导致无法打开的。检查到他的服务器是有放在SugarHosts糖果主机商中,于是我登录他的糖果主机后台看到服务器是正常运行的。但是,我看到面板中的IP地址居然是和他网站解析的IP地址不同。看来官方是有更换域名。于是我就问 客服到底是什...

404notfound是什么意思为你推荐
绵阳电信绵阳电信宽带资费湖南商标注册湖南商标注册最好的公司bluestacks安卓模拟器BlueStacks如何安装使用?1433端口怎么开启本机1433端口手机区号有的手机号中间的号码是地区区号,那是什么卡网站联盟怎样进入网站联盟ps抠图技巧ps的抠图技巧是什么创维云电视功能创维电视怎么用,我买了个创维云电视,现在不知道怎么用手机往电视上传照片,谁能解答以下,idc前线穿越火线河北的服务器好卡 有人知道怎么回事嘛 知道的速回小米手柄小米手柄怎么用?
美国加州vps 免费域名申请 主机屋 重庆服务器托管 服务器评测 流媒体服务器 美国便宜货网站 魔兽世界台湾服务器 牛人与腾讯客服对话 云全民 河南移动邮件系统 炎黄盛世 ftp教程 免费美国空间 上海服务器 域名dns 114dns 徐州电信 北京主机托管 windowsserver2008 更多