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EnglishDataSheet:SLUSCI6UC1843A-SPZHCSFS3A–DECEMBER2016–REVISEDFEBRUARY2019UC1843A-SPQMLV类类耐耐辐辐射射电电流流模模式式PWM控控制制器器11特特性性1符合QMLV类(QMLV)标准,SMD5962-867045962P8670409Vxx:–抗辐射加固保障(RHA)能力高达30-krad(Si)总电离剂量(TID)–通过了45krad/LDR(10mrad/s)测试条件(符合MIL-STD-883测试方法1019.
9的3.
13.
3.
b小节定义的1.
5倍过量测试)下的功能性测试且在规定的后辐射参数限值范围内–展现出低剂量率灵敏度的同时在30krad总剂量水平下仍保持在MIL-STD-883、TM1019所允许的预辐射电气限制范围内经过优化适用于离线和DC-DC转换器低启动电流(5kΩ)Figure17.
TimingResistancevsFrequency9.
2.
2.
2CurrentSensingandLimitingTheUC1843A-SPcurrentsenseinputisconfiguredasshowninFigure18.
Current-to-voltageconversionisdoneexternallywithground-referencedresistorRS.
Undernormaloperation,thepeakvoltageacrossRSiscontrolledbytheE/Aaccordingtothefollowingrelation:whereVC=Controlvoltage=E/Aoutputvoltage(2)RScanbeconnectedtothepowercircuitdirectlyorthroughacurrenttransformer,asFigure18shows.
Whileadirectconnectionissimpler,atransformercanreducepowerdissipationinRS,reduceerrorscausedbythebasecurrent,andprovidelevelshiftingtoeliminatetherestraintofground-referencedsensing.
TherelationbetweenVCandpeakcurrentinthepowerstageisgivenby:whereN=Currentsensetransformerturnsratio=1whentransformernotused.
(3)Forpurposesofsmall-signalanalysis,thecontrol-to-sensed-currentgainis:(4)Whensensingcurrentinserieswiththepowertransistor,asshowninFigure18,thecurrentwaveformoftenhasalargespikeatitsleadingedge.
Thisspikeisduetorectifierrecoveryand/orinter-windingcapacitanceinthepowertransformer.
Ifunattenuated,thistransientcanprematurelyterminatetheoutputpulse.
Asshown,asimpleRCfilterisusuallyadequatetosuppressthisspike.
TheRCtimeconstantshouldbeapproximatelyequaltothecurrentspikeduration(usuallyafewhundrednanoseconds).
TheinvertinginputtotheUC1843A-SPcurrent-sensecomparatorisinternallyclampedto1V(Figure18).
Currentlimitingoccursifthevoltageatpin3reachesthisthresholdvalue,thatis,thecurrentlimitisdefinedby:(5)18UC1843A-SPZHCSFS3A–DECEMBER2016–REVISEDFEBRUARY2019www.
ti.
com.
cnCopyright2016–2019,TexasInstrumentsIncorporatedFigure18.
Transformer-CoupledCurrentSensing9.
2.
2.
3ErrorAmplifierTheerroramplifier(E/A)configurationisshowninFigure19.
Thenon-invertinginputisnotbroughtouttoapin,butisinternallybiasedto5V±2%.
TheE/Aoutputisavailableatpin1forexternalcompensation,allowingtheusertocontroltheconverter'sclosed-loopfrequencyresponse.
Figure20showsanE/Acompensationcircuitsuitableforstabilizinganycurrent-modecontrolledtopologyexceptforflybackandboostconvertersoperatingwithinductorcurrent.
Thefeedbackcomponentsaddapoletothelooptransferfunctionatp=πRF.
RFandCFarechosensothatthispolecancelsthezerooftheoutputfiltercapacitorESRinthepowercircuit.
RIandRFfixthelow-frequencygain.
Theyarechosentoprovideasmuchgainaspossiblewhilestillallowingthepoleformedbytheoutputfiltercapacitorandloadtorollofftheloopgaintounity(0dB)at≈SWITCHING/4.
Thistechniqueensuresconverterstabilitywhileprovidinggooddynamicresponse.
Figure19.
E/AConfiguration19UC1843A-SPwww.
ti.
com.
cnZHCSFS3A–DECEMBER2016–REVISEDFEBRUARY2019Copyright2016–2019,TexasInstrumentsIncorporatedFigure20.
CompensationTheE/Aoutputsources0.
5mAandsinks2mA.
AlowerlimitforRFisgivenby:(6)E/Ainputbiascurrent(2-Amax)flowsthroughRI,resultinginaDCerrorinoutputvoltage(VO)givenby:(7)Therefore,thedesignershouldkeepthevalueofRI,aslowaspossible.
Figure21showstheopen-loopfrequencyresponseoftheUC1843A-SPE/A.
ThegainrepresentsanupperlimitonthegainofthecompensatedE/A.
Phaselagincreasesrapidlyasfrequencyexceeds1MHzduetosecond-orderpolesatabout10MHzandabove.
Continuous-inductor-currentboostandflybackconverterseachhavearight-half-planezerointheirtransferfunction.
AnadditionalcompensationpoleisneededtorolloffloopgainatafrequencylessthanthatoftheRHPzero.
RPandCPinthecircuitofFigure14providethispole.
Figure21.
ErrorAmplifierOpen-LoopFrequencyResponse20UC1843A-SPZHCSFS3A–DECEMBER2016–REVISEDFEBRUARY2019www.
ti.
com.
cnCopyright2016–2019,TexasInstrumentsIncorporated9.
2.
3ApplicationCurvesFigure22.
OscillatorFrequencyvsTimingResistanceFigure23.
MaximumDutyCyclevsTimingResistorFigure24.
OscillationSchematic21UC1843A-SPwww.
ti.
com.
cnZHCSFS3A–DECEMBER2016–REVISEDFEBRUARY2019Copyright2016–2019,TexasInstrumentsIncorporated10PowerSupplyRecommendationsThedevicesaredesignedtooperatefromaninputvoltagesupplyrangebetween8Vand40V.
Thisinputsupplyshouldbewellregulated.
IftheinputsupplyislocatedmorethanafewinchesfromtheUC1843A-SPconverter,additionalbulkcapacitancemayberequiredinadditiontotheceramicbypasscapacitors.
Atantalumcapacitorwithavalueof47Fisatypicalchoice;however,thismayvarydependingupontheoutputpowerbeingdelivered.
Powersupplyspecifications:1.
Inputvoltage:95VACto130VAC(50Hz/60Hz)2.
Lineisolation:3750V3.
Switchingfrequency:40kHz4.
Efficiencyfullload:70%5.
Outputvoltage:a.
+5V,±5%;1-to4-Aload,ripplevoltage:50mVP-Pmaxb.
+12V,±3%;0.
1-to0.
3-Aload,ripplevoltage:100mVP-Pmaxc.
–12V,±3%;0.
1-to0.
3-Aload,ripplevoltage:100mVP-PmaxFigure25.
OfflineFlybackRegulator11Layout11.
1LayoutGuidelinesAlwaystrytousealow-EMIinductorwithaferrite-typeclosedcore.
SomeexampleswouldbetoroidandencasedEcoreinductors.
Opencorecanbeusediftheyhavelow-EMIcharacteristicsandarelocatedafartherawayfromthelow-powertracesandcomponents.
MakethepolesperpendiculartothePCBaswellifusinganopencore.
Stickcoresusuallyemitthemostunwantednoise.
22UC1843A-SPZHCSFS3A–DECEMBER2016–REVISEDFEBRUARY2019www.
ti.
com.
cn版权2016–2019,TexasInstrumentsIncorporatedLayoutGuidelines(continued)11.
1.
1FeedbackTracesTrytorunthefeedbacktraceasfaraspossiblefromtheinductorandnoisypowertraces.
Thedesignershouldalsomakethefeedbacktraceasdirectaspossibleandsomewhatthick.
Thesetwoguidelinessometimesinvolveatrade-off,butkeepingthetraceawayfrominductorEMIandothernoisesourcesisthemorecriticalguideline.
RunthefeedbacktraceonthesideofthePCBoppositeoftheinductorwithagroundplaneseparatingthetwo.
11.
1.
2Input/OutputCapacitorsWhenusingalow-valueceramicinputfiltercapacitor,locateitascloseaspossibletotheVINpinoftheIC.
ThiseliminatesasmuchtraceinductanceeffectsaspossibleandgivestheinternalICrailacleanervoltagesupply.
Somedesignsrequiretheuseofafeed-forwardcapacitorconnectedfromtheoutputtothefeedbackpinaswell,usuallyforstabilityreasons.
Inthiscase,itshouldalsobepositionedascloseaspossibletotheIC.
Usingsurfacemountcapacitorsalsoreducesleadlengthandlessensthechanceofnoisecouplingintotheeffectiveantennacreatedbythrough-holecomponents.
11.
1.
3CompensationComponentsExternalcompensationcomponentsforstabilityshouldalsobeplacedclosetotheIC.
TIrecommendstoalsousesurfacemountcomponentsforthesamereasonsdiscussedforthefiltercapacitors.
Theseshouldnotbelocatedveryclosetotheinductoreither.
11.
1.
4TracesandGroundPlanesMakeallofthepower(high-current)tracesasshort,direct,andthickaspossible.
ItisgoodpracticeonastandardPCBtomakethetracesanabsoluteminimumof15mils(0.
381mm)perampere.
Theinductor,outputcapacitors,andoutputdiodeshouldbeascloseaspossibletoeachother.
ThishelpsreducetheEMIradiatedbythepowertracesduetothehigh-switchingcurrentsthroughthem.
Thisalsoreducesleadinductanceandresistance,whichinturnreducesnoisespikes,ringing,andresistivelossesthatproducevoltageerrors.
ThegroundsoftheIC,inputcapacitors,outputcapacitors,andoutputdiode(ifapplicable)shouldbeconnectedclosetogetherdirectlytoagroundplane.
ItwouldalsobeagoodideatohaveagroundplaneonbothsidesofthePCB.
ThisreducesnoisebyreducinggroundlooperrorsandabsorbingmoreoftheEMIradiatedbytheinductor.
Formulti-layerboardswithmorethantwolayers,agroundplanecanbeusedtoseparatethepowerplane(wherethepowertracesandcomponentsare)andthesignalplane(wherethefeedbackandcompensationandcomponentsare)forimprovedperformance.
Onmulti-layerboards,viasarerequiredtoconnecttracesanddifferentplanes.
Itisagoodpracticetouseonestandardviaper200mAofcurrentifthetraceneedstoconductasignificantamountofcurrentfromoneplanetotheother.
Arrangethecomponentssothattheswitchingcurrentloopscurlinthesamedirection.
Duetothewayswitchingregulatorsoperate,therearetwopowerstates:onestatewhentheswitchisonandonewhentheswitchisoff.
Duringeachstatethereisacurrentloopmadebythepowercomponentsthatarecurrentlyconducting.
Placethepowercomponentssothatduringeachofthetwostatesthecurrentloopisconductinginthesamedirection.
Thispreventsmagneticfieldreversalcausedbythetracesbetweenthetwohalf-cyclesandreducesradiatedEMI.
23UC1843A-SPwww.
ti.
com.
cnZHCSFS3A–DECEMBER2016–REVISEDFEBRUARY2019版权2016–2019,TexasInstrumentsIncorporated11.
2LayoutExampleHighpeakcurrentsassociatedwithcapacitiveloadsnecessitatecarefulgroundingtechniques.
Timingandbypasscapacitorsshouldbeconnectedclosetopin5inasinglepointground.
Thetransistorand5kpotentiometerareusedtosampletheoscillatorwaveformandapplyanadjustableramptopin3.
Figure26.
Open-LoopLaboratoryTestFixture24UC1843A-SPZHCSFS3A–DECEMBER2016–REVISEDFEBRUARY2019www.
ti.
com.
cn版权2016–2019,TexasInstrumentsIncorporated12器器件件和和文文档档支支持持12.
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5术术语语表表SLYZ022—TI术语表.
这份术语表列出并解释术语、缩写和定义.
13机机械械、、封封装装和和可可订订购购信信息息以下页面包含机械、封装和可订购信息.
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IMPORTANTNOTICE邮寄地址:上海市浦东新区世纪大道1568号中建大厦32楼,邮政编码:200122Copyright2019德州仪器半导体技术(上海)有限公司PACKAGEOPTIONADDENDUMwww.
ti.
com9-Mar-2021Addendum-Page1PACKAGINGINFORMATIONOrderableDeviceStatus(1)PackageTypePackageDrawingPinsPackageQtyEcoPlan(2)Leadfinish/Ballmaterial(6)MSLPeakTemp(3)OpTemp(°C)DeviceMarking(4/5)Samples5962-8670406VPAACTIVECDIPJG81Non-RoHS&GreenSNPBN/AforPkgType-55to1258670406VPAUC1843A5962-8670406VXAACTIVELCCCFK201Non-RoHS&GreenSNPBN/AforPkgType-55to1255962-8670406VXAUC1843ALQMLV5962-8670409VPAACTIVECDIPJG81Non-RoHS&GreenSNPBN/AforPkgType-55to1258670409VPAUC1843A-SP5962P8670409VPAACTIVECDIPJG81TBDCallTICallTI-55to125P8670409VPAUC1843A-SP5962P8670409VYCACTIVECFPHKU101TBDCallTICallTI-55to125P8670409VYCUC1843A-SP(1)Themarketingstatusvaluesaredefinedasfollows:ACTIVE:Productdevicerecommendedfornewdesigns.
LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect.
NRND:Notrecommendedfornewdesigns.
Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartinanewdesign.
PREVIEW:Devicehasbeenannouncedbutisnotinproduction.
Samplesmayormaynotbeavailable.
OBSOLETE:TIhasdiscontinuedtheproductionofthedevice.
(2)RoHS:TIdefines"RoHS"tomeansemiconductorproductsthatarecompliantwiththecurrentEURoHSrequirementsforall10RoHSsubstances,includingtherequirementthatRoHSsubstancedonotexceed0.
1%byweightinhomogeneousmaterials.
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RoHSExempt:TIdefines"RoHSExempt"tomeanproductsthatcontainleadbutarecompliantwithEURoHSpursuanttoaspecificEURoHSexemption.
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Antimonytrioxidebasedflameretardantsmustalsomeetthe<=1000ppmthresholdrequirement.
(3)MSL,PeakTemp.
-TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.
(4)Theremaybeadditionalmarking,whichrelatestothelogo,thelottracecodeinformation,ortheenvironmentalcategoryonthedevice.
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OnlyoneDeviceMarkingcontainedinparenthesesandseparatedbya"~"willappearonadevice.
IfalineisindentedthenitisacontinuationofthepreviouslineandthetwocombinedrepresenttheentireDeviceMarkingforthatdevice.
PACKAGEOPTIONADDENDUMwww.
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com9-Mar-2021Addendum-Page2(6)Leadfinish/Ballmaterial-OrderableDevicesmayhavemultiplematerialfinishoptions.
Finishoptionsareseparatedbyaverticalruledline.
Leadfinish/Ballmaterialvaluesmaywraptotwolinesifthefinishvalueexceedsthemaximumcolumnwidth.
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MECHANICALDATAMCER001A–JANUARY1995–REVISEDJANUARY1997POSTOFFICEBOX655303DALLAS,TEXAS75265JG(R-GDIP-T8)CERAMICDUAL-IN-LINE0.
310(7,87)0.
290(7,37)0.
014(0,36)0.
008(0,20)SeatingPlane4040107/C08/96540.
065(1,65)0.
045(1,14)810.
020(0,51)MIN0.
400(10,16)0.
355(9,00)0.
015(0,38)0.
023(0,58)0.
063(1,60)0.
015(0,38)0.
200(5,08)MAX0.
130(3,30)MIN0.
245(6,22)0.
280(7,11)0.
100(2,54)0°–15°NOTES:A.
Alllineardimensionsareininches(millimeters).
B.
Thisdrawingissubjecttochangewithoutnotice.
C.
Thispackagecanbehermeticallysealedwithaceramiclidusingglassfrit.
D.
Indexpointisprovidedoncapforterminalidentification.
E.
FallswithinMILSTD1835GDIP1-T8www.
ti.
comPACKAGEOUTLINEC(4.
7)2.
62MAX8X1.
27(7.
02)2X5.
0810X0.
480.
380.
160.
100.
850.
6722.
7MAX(4.
3)(6.
62)B7.
066.
66A7.
276.
77(6.
248)(6.
248)CFP-2.
63mmmaxheightHKU0010ACERAMICDUALFLATPACK4226200/A09/2020NOTES:1.
Alllineardimensionsareinmillimeters.
Anydimensionsinparenthesisareforreferenceonly.
DimensioningandtolerancingperASMEY14.
5M.
2.
Thisdrawingissubjecttochangewithoutnotice.
3.
Thispackageishermeticallysealedwithametallid.
4.
Theterminalsaregoldplated.
5.
ThisdrawingdoesnotcomplywithMILSTD1835.
Donotusethispackageforcompliantproduct.
6.
Metallidisconnectedtobacksidepadmetalization.
11056PIN1ID0.
2CABMETALLIDPIN1ID11056BACKSIDEPADMETALIZATION(THERMALPAD)SIZEASCALEEXAMPLEBOARDLAYOUT4PAGE3OF(6.
62)(4.
3)(0.
2)TYP(1.
2)TYP(0.
6)(0.
6)(1.
2)TYP3X4226200REVACFP-2.
63mmmaxheightHKU0010ACERAMICDUALFLATPACKHEATSINKLANDPATTERNEXAMPLEEXPOSEDMETALSHOWNSCALE:15XPKGPKG重要声明和免责声明TI提供技术和可靠性数据(包括数据表)、设计资源(包括参考设计)、应用或其他设计建议、网络工具、安全信息和其他资源,不保证没有瑕疵且不做出任何明示或暗示的担保,包括但不限于对适销性、某特定用途方面的适用性或不侵犯任何第三方知识产权的暗示担保.
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IMPORTANTNOTICE邮寄地址:上海市浦东新区世纪大道1568号中建大厦32楼,邮政编码:200122Copyright2021德州仪器半导体技术(上海)有限公司
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LOCVPS在农历新年之后新上架了日本大阪机房软银线路VPS主机,基于KVM架构,配备原生IP,适用全场8折优惠码,最低2GB内存套餐优惠后每月仅76元起。LOCVPS是一家成立于2012年的国人VPS服务商,提供中国香港、韩国、美国、日本、新加坡、德国、荷兰、俄罗斯等地区VPS服务器,基于KVM或XEN架构(推荐选择KVM),线路方面均选择国内直连或优化方案,访问延迟低,适合建站或远程办公使用。...
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