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EnglishDataSheet:SLUSC14UC1845A-SPZHCSDP0A–MAY2015–REVISEDFEBRUARY2019UC1845A-SPQMLV类类耐耐辐辐射射电电流流模模式式PWM控控制制器器1(1)改进的TID辐射性能仅适用于抗辐射加固保障(RHA)器件类型11.
(2)受影响的参数参考输出电压,VREF辐射漂移曲线(请参见VREF辐射漂移曲线).
1特特性性1符合QMLV类(QMLV)标准,SMD5962-867045962P8670411Vxx:(1)–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(2)但在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DC-DC转换器应用低启动电流(5kΩ)Figure15.
TimingResistancevsFrequency9.
2.
2.
2CurrentSensingandLimitingTheUC1845A-SPcurrentsenseinputisconfiguredasshowninFigure16.
Current-to-voltageconversionisdoneexternallywithground-referencedresistorRS.
Undernormaloperation,thepeakvoltageacrossRSiscontrolledbytheE/Aaccordingtothefollowingrelation:whereVC=Controlvoltage=E/Aoutputvoltage(2)RScanbeconnectedtothepowercircuitdirectlyorthroughacurrenttransformer,asFigure16shows.
Whileadirectconnectionissimpler,atransformercanreducepowerdissipationinRS,reduceerrorscausedbythebasecurrent,andprovidelevelshiftingtoeliminatetherestraintofground-referencedsensing.
TherelationbetweenVCandpeakcurrentinthepowerstageisgivenby:whereN=Currentsensetransformerturnsratio=1whentransformernotused.
(3)Forpurposesofsmall-signalanalysis,thecontrol-to-sensed-currentgainis:(4)Whensensingcurrentinserieswiththepowertransistor,asshowninFigure16,thecurrentwaveformoftenhasalargespikeatitsleadingedge.
Thisspikeisduetorectifierrecoveryand/orinter-windingcapacitanceinthepowertransformer.
Ifunattenuated,thistransientcanprematurelyterminatetheoutputpulse.
Asshown,asimpleRCfilterisusuallyadequatetosuppressthisspike.
TheRCtimeconstantshouldbeapproximatelyequaltothecurrentspikeduration(usuallyafewhundrednanoseconds).
TheinvertinginputtotheUC1845A-SPcurrent-sensecomparatorisinternallyclampedto1V(Figure16).
Currentlimitingoccursifthevoltageatpin3reachesthisthresholdvalue,thatis,thecurrentlimitisdefinedby:(5)17UC1845A-SPwww.
ti.
com.
cnZHCSDP0A–MAY2015–REVISEDFEBRUARY2019Copyright2015–2019,TexasInstrumentsIncorporatedFigure16.
Transformer-CoupledCurrentSensing9.
2.
2.
3ErrorAmplifierTheerroramplifier(E/A)configurationisshowninFigure17.
Thenon-invertinginputisnotbroughtouttoapin,butisinternallybiasedto5V±2%.
TheE/Aoutputisavailableatpin1forexternalcompensation,allowingtheusertocontroltheconverter'sclosed-loopfrequencyresponse.
Figure18showsanE/Acompensationcircuitsuitableforstabilizinganycurrent-modecontrolledtopologyexceptforflybackandboostconvertersoperatingwithinductorcurrent.
Thefeedbackcomponentsaddapoletothelooptransferfunctionatp=πRF.
RFandCFarechosensothatthispolecancelsthezerooftheoutputfiltercapacitorESRinthepowercircuit.
RIandRFfixthelow-frequencygain.
Theyarechosentoprovideasmuchgainaspossiblewhilestillallowingthepoleformedbytheoutputfiltercapacitorandloadtorollofftheloopgaintounity(0dB)at≈SWITCHING/4.
Thistechniqueensuresconverterstabilitywhileprovidinggooddynamicresponse.
Figure17.
E/AConfiguration18UC1845A-SPZHCSDP0A–MAY2015–REVISEDFEBRUARY2019www.
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com.
cnCopyright2015–2019,TexasInstrumentsIncorporatedFigure18.
CompensationTheE/Aoutputsources0.
5mAandsinks2mA.
AlowerlimitforRFisgivenby:(6)E/Ainputbiascurrent(2-Amax)flowsthroughRI,resultinginaDCerrorinoutputvoltage(VO)givenby:(7)Therefore,thedesignershouldkeepthevalueofRI,aslowaspossible.
Figure19showstheopen-loopfrequencyresponseoftheUC1845A-SPE/A.
ThegainrepresentsanupperlimitonthegainofthecompensatedE/A.
Phaselagincreasesrapidlyasfrequencyexceeds1MHzduetosecond-orderpolesatabout10MHzandabove.
Continuous-inductor-currentboostandflybackconverterseachhavearight-half-planezerointheirtransferfunction.
AnadditionalcompensationpoleisneededtorolloffloopgainatafrequencylessthanthatoftheRHPzero.
RPandCPinthecircuitofFigure12providethispole.
Figure19.
ErrorAmplifierOpen-LoopFrequencyResponse19UC1845A-SPwww.
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cnZHCSDP0A–MAY2015–REVISEDFEBRUARY2019Copyright2015–2019,TexasInstrumentsIncorporated9.
2.
3ApplicationCurvesFigure20.
OscillatorFrequencyvsTimingResistanceFigure21.
MaximumDutyCyclevsTimingResistorFigure22.
OscillationSchematic20UC1845A-SPZHCSDP0A–MAY2015–REVISEDFEBRUARY2019www.
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cnCopyright2015–2019,TexasInstrumentsIncorporated10PowerSupplyRecommendationsThedevicesaredesignedtooperatefromaninputvoltagesupplyrangebetween8Vand40V.
Thisinputsupplyshouldbewellregulated.
IftheinputsupplyislocatedmorethanafewinchesfromtheUC1845A-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-PmaxFigure23.
OfflineFlybackRegulator11Layout11.
1LayoutGuidelinesAlwaystrytousealow-EMIinductorwithaferrite-typeclosedcore.
SomeexampleswouldbetoroidandencasedEcoreinductors.
Opencorecanbeusediftheyhavelow-EMIcharacteristicsandarelocatedafartherawayfromthelow-powertracesandcomponents.
MakethepolesperpendiculartothePCBaswellifusinganopencore.
Stickcoresusuallyemitthemostunwantednoise.
11.
1.
1FeedbackTracesTrytorunthefeedbacktraceasfaraspossiblefromtheinductorandnoisypowertraces.
Thedesignershouldalsomakethefeedbacktraceasdirectaspossibleandsomewhatthick.
Thesetwoguidelinessometimesinvolveatrade-off,butkeepingthetraceawayfrominductorEMIandothernoisesourcesisthemorecriticalguideline.
RunthefeedbacktraceonthesideofthePCBoppositeoftheinductorwithagroundplaneseparatingthetwo.
21UC1845A-SPwww.
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cnZHCSDP0A–MAY2015–REVISEDFEBRUARY2019版权2015–2019,TexasInstrumentsIncorporatedLayoutGuidelines(continued)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.
11.
2LayoutExampleHighpeakcurrentsassociatedwithcapacitiveloadsnecessitatecarefulgroundingtechniques.
Timingandbypasscapacitorsshouldbeconnectedclosetopin5inasinglepointground.
Thetransistorand5kpotentiometerareusedtosampletheoscillatorwaveformandapplyanadjustableramptopin3.
Figure24.
Open-LoopLaboratoryTestFixture22UC1845A-SPZHCSDP0A–MAY2015–REVISEDFEBRUARY2019www.
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com.
cn版权2015–2019,TexasInstrumentsIncorporated12器器件件和和文文档档支支持持12.
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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.
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com21-Jan-2021Addendum-Page1PACKAGINGINFORMATIONOrderableDeviceStatus(1)PackageTypePackageDrawingPinsPackageQtyEcoPlan(2)Leadfinish/Ballmaterial(6)MSLPeakTemp(3)OpTemp(°C)DeviceMarking(4/5)Samples5962-8670408VPAACTIVECDIPJG81Non-RoHS&GreenSNPBN/AforPkgType-55to1258670408VPAUC1845A5962-8670408VXAACTIVELCCCFK201Non-RoHS&GreenPOST-PLATEN/AforPkgType-55to1255962-8670408VXAUC1845ALQMLV5962P8670411VPAACTIVECDIPJG81TBDCallTICallTI-55to125P8670411VPAUC1845A-SP5962P8670411VYCACTIVECFPHKU101TBDCallTICallTI-55to125P8670411VYCUC1845A-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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Antimonytrioxidebasedflameretardantsmustalsomeetthe<=1000ppmthresholdrequirement.
(3)MSL,PeakTemp.
-TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.
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www.
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:15XPKGPKGMECHANICALDATAMCER001A–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-T8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.