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1FEATURESDESCRIPTION/ORDERINGINFORMATIONUC2843A-Q1www.
ti.
com.
SGLS384–MAY2008CURRENT-MODEPWMCONTROLLERQualifiedforAutomotiveApplicationsExtendedTemperaturePerformanceof–40°Cto125°COptimizedforOff-LineandDC-to-DCConvertersLowStart-UpCurrent(<0.
5mA)TrimmedOscillator-DischargeCurrentAutomaticFeed-ForwardCompensationPulse-by-PulseCurrentLimitingEnhancedLoad-ResponseCharacteristicsUnder-VoltageLockoutWithHysteresisDouble-PulseSuppressionHigh-CurrentTotem-PoleOutputInternallyTrimmedBandgapReference500-kHzOperationLowROErrorAmpTheUC2843AcontrolICisapin-for-pincompatibleimprovedversionoftheUC2843.
Providingthenecessaryfeaturestocontrolcurrentmodeswitchedmodepowersupplies,thisdevicehasthefollowingimprovedfeatures.
Startupcurrentisspecifiedtobelessthan0.
5mA.
Oscillatordischargeistrimmedto8.
3mA.
Duringundervoltagelockout,theoutputstagecansinkatleast10mAatlessthan1.
2VforVCCover5V.
MAXIMUMDUTYPARTNUMBERUVLOONUVLOOFFCYCLEUC2843A8.
5V7.
9V<100%ORDERINGINFORMATION(1)TAPACKAGE(2)ORDERABLEPARTNUMBERTOP-SIDEMARKING–40°Cto125°CSOIC-8–D8Reelof2500UC2843AQD8RQ1UC2843AQ(1)Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orseetheTIwebsiteatwww.
ti.
com.
(2)Packagedrawings,standardpackingquantities,thermaldata,symbolization,andPCBdesignguidelinesareavailableatwww.
ti.
com/sc/package.
1Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright2008,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.
Productionprocessingdoesnotnecessarilyincludetestingofallparameters.
ABSOLUTEMAXIMUMRATINGS(1)(2)UC2843A-Q1SGLS384–MAY2008.
www.
ti.
comFUNCTIONALBLOCKDIAGRAMoveroperatingfree-airtemperaturerange(unlessotherwisenoted)VALUEUNITVCCvoltage(lowimpedancesource)30VVCCvoltage(ICCmA)SelflimitingIOOutputcurrent±1AOutputenergy(capacitiveload)5JAnaloginputs(pins3and5)–0.
3to6.
3VErroramplifieroutputsinkcurrent10mAPowerdissipationatTA<25°C(14-pinDpackage)1WθJAPackagethermalimpedance(3)97°C/WTstgStoragetemperaturerange–65to150°CLeadtemperaturesoldering1,6mm(1/16inch)fromcasefor10seconds260°C(1)StressesbeyondthoselistedunderAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.
Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderRecommendedOperatingConditionsisnotimplied.
Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.
(2)Unlessotherwiseindicated,voltagesarereferencetoground,andcurrentsarepositiveintoandnegativeoutofthespecifiedterminals.
(3)Long-termhigh-temperaturestorageand/orextendeduseatmaximumrecommendedoperatingconditionsmayresultinareductionofoveralldevicelife.
Seehttp://www.
ti.
com/ep_qualityforadditionalinformationonenhancedplasticpackaging.
2SubmitDocumentationFeedbackCopyright2008,TexasInstrumentsIncorporatedProductFolderLink(s):UC2843A-Q1ELECTRICALCHARACTERISTICSUC2843A-Q1www.
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SGLS384–MAY2008TA=–40°Cto125°C,VCC=15V(1),RT=10k,CT=3.
3nF,TA=TJ(unlessotherwisestated)PARAMETERTESTCONDITIONSMINTYPMAXUNITReferenceSectionOutputvoltageTJ=25°C,IO=1mA4.
955.
05.
05VLineregulationvoltageVIN=12Vto25V620mVLoadregulationvoltageIO=1mAto20mA625mVTemperaturestability(2)(3)0.
20.
4mV/°CTotaloutputvariationvoltageLine,load,temperature4.
95.
1VOutputnoisevoltagef=10Hzto10kHzTJ=25°C50VLongtermstability1000hoursTA=125°C525mVOutputshort-circuitcurrent–30–100–180mAOscillatorSectionInitialaccuracy(4)TJ=25°C475257kHzVoltagestabilityVCC=12Vto25V0.
21%TemperaturestabilityTA=MINtoMAX5%Amplitudepeak-to-peakVpin71.
7VTJ=25°C7.
88.
38.
8Dischargecurrent(5)Vpin7=2VmATJ=Fullrange7.
58.
8ErrorAmplifierSectionInputvoltageCOMP=2.
5V2.
452.
52.
55VInputbiascurrent–0.
3–1AOpenloopvoltagegain(AVOL)VO=2Vto4V6590dBUnitygainbandwidth(3)TJ=25°C0.
71MHzPSRRVCC=12Vto25V6070dBOutputsinkcurrentFB=2.
7V,COMP=1.
1V26mAOutputsourcecurrentFB=2.
3V,COMP=5V–0.
5–0.
8mAVOUThighFB=2.
3V,RL=15kΩtoGND56VVOUTlowFB=2.
7V,RL=15kΩtoVREF0.
71.
1VCurrentSenseSectionGain(6)(7)2.
8533.
15V/VMaximuminputsignal(6)COMP=5V0.
911.
1VPSRR(6)VCC=12Vto25V70dBInputbiascurrent–2–10ADelaytooutput(3)ISENSE=0Vto2V150300ns(1)AdjustVCCabovethestartthresholdbeforesettingat15V.
(2)Temperaturestability,sometimesreferredtoasaveragetemperaturecoefficient,isdescribedbytheequation:TemperatureStability=(VREF(max)–VREF(min))/(TJ(max)–TJ(min)).
VREF(max)andVREF(min)arethemaximumandminimumreferencevoltagemeasuredovertheappropriatetemperaturerange.
Notethattheextremesinvoltagedonotnecessarilyoccurattheextremesintemperature.
(3)Specifiedbydesign.
(4)OutputfrequencyequalsoscillatorfrequencyfortheUC2843A.
(5)ThisparameterismeasuredwithRT=10ktoVREF.
Thiscontributesapproximately300Aofcurrenttothemeasurement.
ThetotalcurrentflowingintotheRT/RCpinisapproximately300Ahigherthanthemeasuredvalue.
(6)ParametermeasuredattrippointoflatchwithVFBat0V.
(7)Gainisdefinedby:A=ΔVCOMP/ΔVSENSE;0≤VSENSE≤0.
8V.
Copyright2008,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3ProductFolderLink(s):UC2843A-Q1UC2843A-Q1SGLS384–MAY2008.
www.
ti.
comELECTRICALCHARACTERISTICS(continued)TA=–40°Cto125°C,VCC=15V,RT=10k,CT=3.
3nF,TA=TJ(unlessotherwisestated)PARAMETERTESTCONDITIONSMINTYPMAXUNITOutputSection(OUT)IOUT=20mA0.
10.
4LowleveloutputvoltageVIOUT=200mA152.
2IOUT=–20mA1313.
5HighleveloutputvoltageVIOUT=–200mA1213.
5Risetime(8)CL=1nFTJ=25°C50150nsFalltime(8)CL=1nFTJ=25°C50150nsUVLOsaturationVCC=5V,IOUT=10mA0.
71.
2VUndervoltageLockoutSection(UVLO)Startthreshold7.
88.
49VMinimumoperationvoltageafter77.
68.
2VturnonPWMSectionMaximumdutycycle9496100%Minimumdutycycle0%TotalStandbyCurrentStart-upcurrent0.
30.
5mAOperatingsupplycurrentFB=0V,SENSE=0V1117mAVCCinternalzenervoltageICC=25mA3034V(8)Specifiedbydesign.
4SubmitDocumentationFeedbackCopyright2008,TexasInstrumentsIncorporatedProductFolderLink(s):UC2843A-Q1PARAMETERMEASUREMENTINFORMATIONUC2843A-Q1www.
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SGLS384–MAY2008A.
Theerroramplifiercansourceupto0.
5mAandsinkupto2mA.
Figure1.
ErrorAmpConfigurationFigure2.
UndervoltageLockoutA.
Peakcurrent(Is)isdeterminedbytheformula:Ismax=1.
0V/RSAsmallRCfiltermayberequiredtosupressswitchtransients.
Figure3.
CurrentSenseCircuitCopyright2008,TexasInstrumentsIncorporatedSubmitDocumentationFeedback5ProductFolderLink(s):UC2843A-Q1UC2843A-Q1SGLS384–MAY2008.
www.
ti.
comPARAMETERMEASUREMENTINFORMATION(continued)Figure4.
Figure5.
6SubmitDocumentationFeedbackCopyright2008,TexasInstrumentsIncorporatedProductFolderLink(s):UC2843A-Q1APPLICATIONINFORMATIONUC2843A-Q1www.
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com.
SGLS384–MAY2008Figure6.
OscillatorA.
Highpeakcurrentsassociatedwithcapacitiveloadsnecessitatecarefulgroundingtechniques.
Timingandbypasscapacitorsshouldbeconnectedclosetopin5inasinglepointground.
Thetransistorand5kpotentiometerareusedtosampletheoscillatorwaveformandapplyanadjustableramptopin3.
Figure7.
Open-LoopLaboratoryTextFixtureCopyright2008,TexasInstrumentsIncorporatedSubmitDocumentationFeedback7ProductFolderLink(s):UC2843A-Q1UC2843A-Q1SGLS384–MAY2008.
www.
ti.
comFigure8.
SlopeCompressionFigure9.
Off-LineFlybackRegulator8SubmitDocumentationFeedbackCopyright2008,TexasInstrumentsIncorporatedProductFolderLink(s):UC2843A-Q1PACKAGEOPTIONADDENDUMwww.
ti.
com10-Dec-2020Addendum-Page1PACKAGINGINFORMATIONOrderableDeviceStatus(1)PackageTypePackageDrawingPinsPackageQtyEcoPlan(2)Leadfinish/Ballmaterial(6)MSLPeakTemp(3)OpTemp(°C)DeviceMarking(4/5)SamplesUC2843AQD8RQ1ACTIVESOICD82500RoHS&GreenNIPDAULevel-1-260C-UNLIM-40to125(2843AQ,UC2843AQ)(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.
Wheredesignedtobesolderedathightemperatures,"RoHS"productsaresuitableforuseinspecifiedlead-freeprocesses.
TImayreferencethesetypesofproductsas"Pb-Free".
RoHSExempt:TIdefines"RoHSExempt"tomeanproductsthatcontainleadbutarecompliantwithEURoHSpursuanttoaspecificEURoHSexemption.
Green:TIdefines"Green"tomeanthecontentofChlorine(Cl)andBromine(Br)basedflameretardantsmeetJS709Blowhalogenrequirementsof<=1000ppmthreshold.
Antimonytrioxidebasedflameretardantsmustalsomeetthe<=1000ppmthresholdrequirement.
(3)MSL,PeakTemp.
-TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.
(4)Theremaybeadditionalmarking,whichrelatestothelogo,thelottracecodeinformation,ortheenvironmentalcategoryonthedevice.
(5)MultipleDeviceMarkingswillbeinsideparentheses.
OnlyoneDeviceMarkingcontainedinparenthesesandseparatedbya"~"willappearonadevice.
IfalineisindentedthenitisacontinuationofthepreviouslineandthetwocombinedrepresenttheentireDeviceMarkingforthatdevice.
(6)Leadfinish/Ballmaterial-OrderableDevicesmayhavemultiplematerialfinishoptions.
Finishoptionsareseparatedbyaverticalruledline.
Leadfinish/Ballmaterialvaluesmaywraptotwolinesifthefinishvalueexceedsthemaximumcolumnwidth.
ImportantInformationandDisclaimer:TheinformationprovidedonthispagerepresentsTI'sknowledgeandbeliefasofthedatethatitisprovided.
TIbasesitsknowledgeandbeliefoninformationprovidedbythirdparties,andmakesnorepresentationorwarrantyastotheaccuracyofsuchinformation.
Effortsareunderwaytobetterintegrateinformationfromthirdparties.
TIhastakenandcontinuestotakereasonablestepstoproviderepresentativeandaccurateinformationbutmaynothaveconducteddestructivetestingorchemicalanalysisonincomingmaterialsandchemicals.
TIandTIsuppliersconsidercertaininformationtobeproprietary,andthusCASnumbersandotherlimitedinformationmaynotbeavailableforrelease.
InnoeventshallTI'sliabilityarisingoutofsuchinformationexceedthetotalpurchasepriceoftheTIpart(s)atissueinthisdocumentsoldbyTItoCustomeronanannualbasis.
PACKAGEOPTIONADDENDUMwww.
ti.
com10-Dec-2020Addendum-Page2OTHERQUALIFIEDVERSIONSOFUC2843A-Q1:Catalog:UC2843ANOTE:QualifiedVersionDefinitions:Catalog-TI'sstandardcatalogproductTAPEANDREELINFORMATION*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQReelDiameter(mm)ReelWidthW1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W(mm)Pin1QuadrantUC2843AQD8RQ1SOICD82500330.
012.
46.
45.
22.
18.
012.
0Q1PACKAGEMATERIALSINFORMATIONwww.
ti.
com18-Nov-2020PackMaterials-Page1*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQLength(mm)Width(mm)Height(mm)UC2843AQD8RQ1SOICD82500853.
0449.
035.
0PACKAGEMATERIALSINFORMATIONwww.
ti.
com18-Nov-2020PackMaterials-Page2www.
ti.
comPACKAGEOUTLINEC.
228-.
244TYP[5.
80-6.
19].
069MAX[1.
75]6X.
050[1.
27]8X.
012-.
020[0.
31-0.
51]2X.
150[3.
81].
005-.
010TYP[0.
13-0.
25]0-8.
004-.
010[0.
11-0.
25].
010[0.
25].
016-.
050[0.
41-1.
27]4X(0-15)A.
189-.
197[4.
81-5.
00]NOTE3B.
150-.
157[3.
81-3.
98]NOTE44X(0-15)(.
041)[1.
04]SOIC-1.
75mmmaxheightD0008ASMALLOUTLINEINTEGRATEDCIRCUIT4214825/C02/2019NOTES:1.
Lineardimensionsareininches[millimeters].
Dimensionsinparenthesisareforreferenceonly.
Controllingdimensionsareininches.
DimensioningandtolerancingperASMEY14.
5M.
2.
Thisdrawingissubjecttochangewithoutnotice.
3.
Thisdimensiondoesnotincludemoldflash,protrusions,orgateburrs.
Moldflash,protrusions,orgateburrsshallnotexceed.
006[0.
15]perside.
4.
Thisdimensiondoesnotincludeinterleadflash.
5.
ReferenceJEDECregistrationMS-012,variationAA.
18.
010[0.
25]CAB54PIN1IDAREASEATINGPLANE.
004[0.
1]CSEEDETAILADETAILATYPICALSCALE2.
800www.
ti.
comEXAMPLEBOARDLAYOUT.
0028MAX[0.
07]ALLAROUND.
0028MIN[0.
07]ALLAROUND(.
213)[5.
4]6X(.
050)[1.
27]8X(.
061)[1.
55]8X(.
024)[0.
6](R.
002)TYP[0.
05]SOIC-1.
75mmmaxheightD0008ASMALLOUTLINEINTEGRATEDCIRCUIT4214825/C02/2019NOTES:(continued)6.
PublicationIPC-7351mayhavealternatedesigns.
7.
Soldermasktolerancesbetweenandaroundsignalpadscanvarybasedonboardfabricationsite.
METALSOLDERMASKOPENINGNONSOLDERMASKDEFINEDSOLDERMASKDETAILSEXPOSEDMETALOPENINGSOLDERMASKMETALUNDERSOLDERMASKSOLDERMASKDEFINEDEXPOSEDMETALLANDPATTERNEXAMPLEEXPOSEDMETALSHOWNSCALE:8XSYMM1458SEEDETAILSSYMMwww.
ti.
comEXAMPLESTENCILDESIGN8X(.
061)[1.
55]8X(.
024)[0.
6]6X(.
050)[1.
27](.
213)[5.
4](R.
002)TYP[0.
05]SOIC-1.
75mmmaxheightD0008ASMALLOUTLINEINTEGRATEDCIRCUIT4214825/C02/2019NOTES:(continued)8.
Lasercuttingapertureswithtrapezoidalwallsandroundedcornersmayofferbetterpasterelease.
IPC-7525mayhavealternatedesignrecommendations.
9.
Boardassemblysitemayhavedifferentrecommendationsforstencildesign.
SOLDERPASTEEXAMPLEBASEDON.
005INCH[0.
125MM]THICKSTENCILSCALE:8XSYMMSYMM1458IMPORTANTNOTICEANDDISCLAIMERTIPROVIDESTECHNICALANDRELIABILITYDATA(INCLUDINGDATASHEETS),DESIGNRESOURCES(INCLUDINGREFERENCEDESIGNS),APPLICATIONOROTHERDESIGNADVICE,WEBTOOLS,SAFETYINFORMATION,ANDOTHERRESOURCES"ASIS"ANDWITHALLFAULTS,ANDDISCLAIMSALLWARRANTIES,EXPRESSANDIMPLIED,INCLUDINGWITHOUTLIMITATIONANYIMPLIEDWARRANTIESOFMERCHANTABILITY,FITNESSFORAPARTICULARPURPOSEORNON-INFRINGEMENTOFTHIRDPARTYINTELLECTUALPROPERTYRIGHTS.
TheseresourcesareintendedforskilleddevelopersdesigningwithTIproducts.
Youaresolelyresponsiblefor(1)selectingtheappropriateTIproductsforyourapplication,(2)designing,validatingandtestingyourapplication,and(3)ensuringyourapplicationmeetsapplicablestandards,andanyothersafety,security,orotherrequirements.
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TI'sprovisionoftheseresourcesdoesnotexpandorotherwisealterTI'sapplicablewarrantiesorwarrantydisclaimersforTIproducts.
MailingAddress:TexasInstruments,PostOfficeBox655303,Dallas,Texas75265Copyright2020,TexasInstrumentsIncorporated
ti.
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SGLS384–MAY2008CURRENT-MODEPWMCONTROLLERQualifiedforAutomotiveApplicationsExtendedTemperaturePerformanceof–40°Cto125°COptimizedforOff-LineandDC-to-DCConvertersLowStart-UpCurrent(<0.
5mA)TrimmedOscillator-DischargeCurrentAutomaticFeed-ForwardCompensationPulse-by-PulseCurrentLimitingEnhancedLoad-ResponseCharacteristicsUnder-VoltageLockoutWithHysteresisDouble-PulseSuppressionHigh-CurrentTotem-PoleOutputInternallyTrimmedBandgapReference500-kHzOperationLowROErrorAmpTheUC2843AcontrolICisapin-for-pincompatibleimprovedversionoftheUC2843.
Providingthenecessaryfeaturestocontrolcurrentmodeswitchedmodepowersupplies,thisdevicehasthefollowingimprovedfeatures.
Startupcurrentisspecifiedtobelessthan0.
5mA.
Oscillatordischargeistrimmedto8.
3mA.
Duringundervoltagelockout,theoutputstagecansinkatleast10mAatlessthan1.
2VforVCCover5V.
MAXIMUMDUTYPARTNUMBERUVLOONUVLOOFFCYCLEUC2843A8.
5V7.
9V<100%ORDERINGINFORMATION(1)TAPACKAGE(2)ORDERABLEPARTNUMBERTOP-SIDEMARKING–40°Cto125°CSOIC-8–D8Reelof2500UC2843AQD8RQ1UC2843AQ(1)Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orseetheTIwebsiteatwww.
ti.
com.
(2)Packagedrawings,standardpackingquantities,thermaldata,symbolization,andPCBdesignguidelinesareavailableatwww.
ti.
com/sc/package.
1Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright2008,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.
Productionprocessingdoesnotnecessarilyincludetestingofallparameters.
ABSOLUTEMAXIMUMRATINGS(1)(2)UC2843A-Q1SGLS384–MAY2008.
www.
ti.
comFUNCTIONALBLOCKDIAGRAMoveroperatingfree-airtemperaturerange(unlessotherwisenoted)VALUEUNITVCCvoltage(lowimpedancesource)30VVCCvoltage(ICCmA)SelflimitingIOOutputcurrent±1AOutputenergy(capacitiveload)5JAnaloginputs(pins3and5)–0.
3to6.
3VErroramplifieroutputsinkcurrent10mAPowerdissipationatTA<25°C(14-pinDpackage)1WθJAPackagethermalimpedance(3)97°C/WTstgStoragetemperaturerange–65to150°CLeadtemperaturesoldering1,6mm(1/16inch)fromcasefor10seconds260°C(1)StressesbeyondthoselistedunderAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.
Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderRecommendedOperatingConditionsisnotimplied.
Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.
(2)Unlessotherwiseindicated,voltagesarereferencetoground,andcurrentsarepositiveintoandnegativeoutofthespecifiedterminals.
(3)Long-termhigh-temperaturestorageand/orextendeduseatmaximumrecommendedoperatingconditionsmayresultinareductionofoveralldevicelife.
Seehttp://www.
ti.
com/ep_qualityforadditionalinformationonenhancedplasticpackaging.
2SubmitDocumentationFeedbackCopyright2008,TexasInstrumentsIncorporatedProductFolderLink(s):UC2843A-Q1ELECTRICALCHARACTERISTICSUC2843A-Q1www.
ti.
com.
SGLS384–MAY2008TA=–40°Cto125°C,VCC=15V(1),RT=10k,CT=3.
3nF,TA=TJ(unlessotherwisestated)PARAMETERTESTCONDITIONSMINTYPMAXUNITReferenceSectionOutputvoltageTJ=25°C,IO=1mA4.
955.
05.
05VLineregulationvoltageVIN=12Vto25V620mVLoadregulationvoltageIO=1mAto20mA625mVTemperaturestability(2)(3)0.
20.
4mV/°CTotaloutputvariationvoltageLine,load,temperature4.
95.
1VOutputnoisevoltagef=10Hzto10kHzTJ=25°C50VLongtermstability1000hoursTA=125°C525mVOutputshort-circuitcurrent–30–100–180mAOscillatorSectionInitialaccuracy(4)TJ=25°C475257kHzVoltagestabilityVCC=12Vto25V0.
21%TemperaturestabilityTA=MINtoMAX5%Amplitudepeak-to-peakVpin71.
7VTJ=25°C7.
88.
38.
8Dischargecurrent(5)Vpin7=2VmATJ=Fullrange7.
58.
8ErrorAmplifierSectionInputvoltageCOMP=2.
5V2.
452.
52.
55VInputbiascurrent–0.
3–1AOpenloopvoltagegain(AVOL)VO=2Vto4V6590dBUnitygainbandwidth(3)TJ=25°C0.
71MHzPSRRVCC=12Vto25V6070dBOutputsinkcurrentFB=2.
7V,COMP=1.
1V26mAOutputsourcecurrentFB=2.
3V,COMP=5V–0.
5–0.
8mAVOUThighFB=2.
3V,RL=15kΩtoGND56VVOUTlowFB=2.
7V,RL=15kΩtoVREF0.
71.
1VCurrentSenseSectionGain(6)(7)2.
8533.
15V/VMaximuminputsignal(6)COMP=5V0.
911.
1VPSRR(6)VCC=12Vto25V70dBInputbiascurrent–2–10ADelaytooutput(3)ISENSE=0Vto2V150300ns(1)AdjustVCCabovethestartthresholdbeforesettingat15V.
(2)Temperaturestability,sometimesreferredtoasaveragetemperaturecoefficient,isdescribedbytheequation:TemperatureStability=(VREF(max)–VREF(min))/(TJ(max)–TJ(min)).
VREF(max)andVREF(min)arethemaximumandminimumreferencevoltagemeasuredovertheappropriatetemperaturerange.
Notethattheextremesinvoltagedonotnecessarilyoccurattheextremesintemperature.
(3)Specifiedbydesign.
(4)OutputfrequencyequalsoscillatorfrequencyfortheUC2843A.
(5)ThisparameterismeasuredwithRT=10ktoVREF.
Thiscontributesapproximately300Aofcurrenttothemeasurement.
ThetotalcurrentflowingintotheRT/RCpinisapproximately300Ahigherthanthemeasuredvalue.
(6)ParametermeasuredattrippointoflatchwithVFBat0V.
(7)Gainisdefinedby:A=ΔVCOMP/ΔVSENSE;0≤VSENSE≤0.
8V.
Copyright2008,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3ProductFolderLink(s):UC2843A-Q1UC2843A-Q1SGLS384–MAY2008.
www.
ti.
comELECTRICALCHARACTERISTICS(continued)TA=–40°Cto125°C,VCC=15V,RT=10k,CT=3.
3nF,TA=TJ(unlessotherwisestated)PARAMETERTESTCONDITIONSMINTYPMAXUNITOutputSection(OUT)IOUT=20mA0.
10.
4LowleveloutputvoltageVIOUT=200mA152.
2IOUT=–20mA1313.
5HighleveloutputvoltageVIOUT=–200mA1213.
5Risetime(8)CL=1nFTJ=25°C50150nsFalltime(8)CL=1nFTJ=25°C50150nsUVLOsaturationVCC=5V,IOUT=10mA0.
71.
2VUndervoltageLockoutSection(UVLO)Startthreshold7.
88.
49VMinimumoperationvoltageafter77.
68.
2VturnonPWMSectionMaximumdutycycle9496100%Minimumdutycycle0%TotalStandbyCurrentStart-upcurrent0.
30.
5mAOperatingsupplycurrentFB=0V,SENSE=0V1117mAVCCinternalzenervoltageICC=25mA3034V(8)Specifiedbydesign.
4SubmitDocumentationFeedbackCopyright2008,TexasInstrumentsIncorporatedProductFolderLink(s):UC2843A-Q1PARAMETERMEASUREMENTINFORMATIONUC2843A-Q1www.
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com.
SGLS384–MAY2008A.
Theerroramplifiercansourceupto0.
5mAandsinkupto2mA.
Figure1.
ErrorAmpConfigurationFigure2.
UndervoltageLockoutA.
Peakcurrent(Is)isdeterminedbytheformula:Ismax=1.
0V/RSAsmallRCfiltermayberequiredtosupressswitchtransients.
Figure3.
CurrentSenseCircuitCopyright2008,TexasInstrumentsIncorporatedSubmitDocumentationFeedback5ProductFolderLink(s):UC2843A-Q1UC2843A-Q1SGLS384–MAY2008.
www.
ti.
comPARAMETERMEASUREMENTINFORMATION(continued)Figure4.
Figure5.
6SubmitDocumentationFeedbackCopyright2008,TexasInstrumentsIncorporatedProductFolderLink(s):UC2843A-Q1APPLICATIONINFORMATIONUC2843A-Q1www.
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com.
SGLS384–MAY2008Figure6.
OscillatorA.
Highpeakcurrentsassociatedwithcapacitiveloadsnecessitatecarefulgroundingtechniques.
Timingandbypasscapacitorsshouldbeconnectedclosetopin5inasinglepointground.
Thetransistorand5kpotentiometerareusedtosampletheoscillatorwaveformandapplyanadjustableramptopin3.
Figure7.
Open-LoopLaboratoryTextFixtureCopyright2008,TexasInstrumentsIncorporatedSubmitDocumentationFeedback7ProductFolderLink(s):UC2843A-Q1UC2843A-Q1SGLS384–MAY2008.
www.
ti.
comFigure8.
SlopeCompressionFigure9.
Off-LineFlybackRegulator8SubmitDocumentationFeedbackCopyright2008,TexasInstrumentsIncorporatedProductFolderLink(s):UC2843A-Q1PACKAGEOPTIONADDENDUMwww.
ti.
com10-Dec-2020Addendum-Page1PACKAGINGINFORMATIONOrderableDeviceStatus(1)PackageTypePackageDrawingPinsPackageQtyEcoPlan(2)Leadfinish/Ballmaterial(6)MSLPeakTemp(3)OpTemp(°C)DeviceMarking(4/5)SamplesUC2843AQD8RQ1ACTIVESOICD82500RoHS&GreenNIPDAULevel-1-260C-UNLIM-40to125(2843AQ,UC2843AQ)(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.
Wheredesignedtobesolderedathightemperatures,"RoHS"productsaresuitableforuseinspecifiedlead-freeprocesses.
TImayreferencethesetypesofproductsas"Pb-Free".
RoHSExempt:TIdefines"RoHSExempt"tomeanproductsthatcontainleadbutarecompliantwithEURoHSpursuanttoaspecificEURoHSexemption.
Green:TIdefines"Green"tomeanthecontentofChlorine(Cl)andBromine(Br)basedflameretardantsmeetJS709Blowhalogenrequirementsof<=1000ppmthreshold.
Antimonytrioxidebasedflameretardantsmustalsomeetthe<=1000ppmthresholdrequirement.
(3)MSL,PeakTemp.
-TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.
(4)Theremaybeadditionalmarking,whichrelatestothelogo,thelottracecodeinformation,ortheenvironmentalcategoryonthedevice.
(5)MultipleDeviceMarkingswillbeinsideparentheses.
OnlyoneDeviceMarkingcontainedinparenthesesandseparatedbya"~"willappearonadevice.
IfalineisindentedthenitisacontinuationofthepreviouslineandthetwocombinedrepresenttheentireDeviceMarkingforthatdevice.
(6)Leadfinish/Ballmaterial-OrderableDevicesmayhavemultiplematerialfinishoptions.
Finishoptionsareseparatedbyaverticalruledline.
Leadfinish/Ballmaterialvaluesmaywraptotwolinesifthefinishvalueexceedsthemaximumcolumnwidth.
ImportantInformationandDisclaimer:TheinformationprovidedonthispagerepresentsTI'sknowledgeandbeliefasofthedatethatitisprovided.
TIbasesitsknowledgeandbeliefoninformationprovidedbythirdparties,andmakesnorepresentationorwarrantyastotheaccuracyofsuchinformation.
Effortsareunderwaytobetterintegrateinformationfromthirdparties.
TIhastakenandcontinuestotakereasonablestepstoproviderepresentativeandaccurateinformationbutmaynothaveconducteddestructivetestingorchemicalanalysisonincomingmaterialsandchemicals.
TIandTIsuppliersconsidercertaininformationtobeproprietary,andthusCASnumbersandotherlimitedinformationmaynotbeavailableforrelease.
InnoeventshallTI'sliabilityarisingoutofsuchinformationexceedthetotalpurchasepriceoftheTIpart(s)atissueinthisdocumentsoldbyTItoCustomeronanannualbasis.
PACKAGEOPTIONADDENDUMwww.
ti.
com10-Dec-2020Addendum-Page2OTHERQUALIFIEDVERSIONSOFUC2843A-Q1:Catalog:UC2843ANOTE:QualifiedVersionDefinitions:Catalog-TI'sstandardcatalogproductTAPEANDREELINFORMATION*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQReelDiameter(mm)ReelWidthW1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W(mm)Pin1QuadrantUC2843AQD8RQ1SOICD82500330.
012.
46.
45.
22.
18.
012.
0Q1PACKAGEMATERIALSINFORMATIONwww.
ti.
com18-Nov-2020PackMaterials-Page1*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQLength(mm)Width(mm)Height(mm)UC2843AQD8RQ1SOICD82500853.
0449.
035.
0PACKAGEMATERIALSINFORMATIONwww.
ti.
com18-Nov-2020PackMaterials-Page2www.
ti.
comPACKAGEOUTLINEC.
228-.
244TYP[5.
80-6.
19].
069MAX[1.
75]6X.
050[1.
27]8X.
012-.
020[0.
31-0.
51]2X.
150[3.
81].
005-.
010TYP[0.
13-0.
25]0-8.
004-.
010[0.
11-0.
25].
010[0.
25].
016-.
050[0.
41-1.
27]4X(0-15)A.
189-.
197[4.
81-5.
00]NOTE3B.
150-.
157[3.
81-3.
98]NOTE44X(0-15)(.
041)[1.
04]SOIC-1.
75mmmaxheightD0008ASMALLOUTLINEINTEGRATEDCIRCUIT4214825/C02/2019NOTES:1.
Lineardimensionsareininches[millimeters].
Dimensionsinparenthesisareforreferenceonly.
Controllingdimensionsareininches.
DimensioningandtolerancingperASMEY14.
5M.
2.
Thisdrawingissubjecttochangewithoutnotice.
3.
Thisdimensiondoesnotincludemoldflash,protrusions,orgateburrs.
Moldflash,protrusions,orgateburrsshallnotexceed.
006[0.
15]perside.
4.
Thisdimensiondoesnotincludeinterleadflash.
5.
ReferenceJEDECregistrationMS-012,variationAA.
18.
010[0.
25]CAB54PIN1IDAREASEATINGPLANE.
004[0.
1]CSEEDETAILADETAILATYPICALSCALE2.
800www.
ti.
comEXAMPLEBOARDLAYOUT.
0028MAX[0.
07]ALLAROUND.
0028MIN[0.
07]ALLAROUND(.
213)[5.
4]6X(.
050)[1.
27]8X(.
061)[1.
55]8X(.
024)[0.
6](R.
002)TYP[0.
05]SOIC-1.
75mmmaxheightD0008ASMALLOUTLINEINTEGRATEDCIRCUIT4214825/C02/2019NOTES:(continued)6.
PublicationIPC-7351mayhavealternatedesigns.
7.
Soldermasktolerancesbetweenandaroundsignalpadscanvarybasedonboardfabricationsite.
METALSOLDERMASKOPENINGNONSOLDERMASKDEFINEDSOLDERMASKDETAILSEXPOSEDMETALOPENINGSOLDERMASKMETALUNDERSOLDERMASKSOLDERMASKDEFINEDEXPOSEDMETALLANDPATTERNEXAMPLEEXPOSEDMETALSHOWNSCALE:8XSYMM1458SEEDETAILSSYMMwww.
ti.
comEXAMPLESTENCILDESIGN8X(.
061)[1.
55]8X(.
024)[0.
6]6X(.
050)[1.
27](.
213)[5.
4](R.
002)TYP[0.
05]SOIC-1.
75mmmaxheightD0008ASMALLOUTLINEINTEGRATEDCIRCUIT4214825/C02/2019NOTES:(continued)8.
Lasercuttingapertureswithtrapezoidalwallsandroundedcornersmayofferbetterpasterelease.
IPC-7525mayhavealternatedesignrecommendations.
9.
Boardassemblysitemayhavedifferentrecommendationsforstencildesign.
SOLDERPASTEEXAMPLEBASEDON.
005INCH[0.
125MM]THICKSTENCILSCALE:8XSYMMSYMM1458IMPORTANTNOTICEANDDISCLAIMERTIPROVIDESTECHNICALANDRELIABILITYDATA(INCLUDINGDATASHEETS),DESIGNRESOURCES(INCLUDINGREFERENCEDESIGNS),APPLICATIONOROTHERDESIGNADVICE,WEBTOOLS,SAFETYINFORMATION,ANDOTHERRESOURCES"ASIS"ANDWITHALLFAULTS,ANDDISCLAIMSALLWARRANTIES,EXPRESSANDIMPLIED,INCLUDINGWITHOUTLIMITATIONANYIMPLIEDWARRANTIESOFMERCHANTABILITY,FITNESSFORAPARTICULARPURPOSEORNON-INFRINGEMENTOFTHIRDPARTYINTELLECTUALPROPERTYRIGHTS.
TheseresourcesareintendedforskilleddevelopersdesigningwithTIproducts.
Youaresolelyresponsiblefor(1)selectingtheappropriateTIproductsforyourapplication,(2)designing,validatingandtestingyourapplication,and(3)ensuringyourapplicationmeetsapplicablestandards,andanyothersafety,security,orotherrequirements.
Theseresourcesaresubjecttochangewithoutnotice.
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MailingAddress:TexasInstruments,PostOfficeBox655303,Dallas,Texas75265Copyright2020,TexasInstrumentsIncorporated
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