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UCC25230www.
ti.
comSLUSAQ6B–NOVEMBER2011–REVISEDAPRIL201212-Vto100-VInput,0.
2-AOutputSwitchingConverterCheckforSamples:UCC252301FEATURESAPPLICATIONS2HighlyIntegratedConverterOperatingasaHighDensityIsolatedStandbyBiasSuppliesBuck,orIsolatedForward-Flyback,FlybuckDC-to-DCConvertersWideOperatingInputVoltageRangefrom12Vto100V,105-VSurge.
DESCRIPTIONTheUCC25230isahighlyintegratedPWMconverterUpto0.
2-AOutputCurrentoperatingasanisolatedforwardflyback.
Ithashigh-9-VAlwaysAvailableVDDOutputwithupto2-sideandlow-sidepowerswitchesintegratedandthemACurrentCapabilitycontrolcircuitwithallkeyconverterfunctionsThermallyEnhanced4-mmx4-mmSON-8/S-included.
Thepowerstagerequiresonlyone-orPVSON-N8(DRM)Packagemultiplewindingcoupledinductorandoutputcapacitorsforthecompletesolution.
Voltage-modeInternallySetFixed380-kHzSwitchingfeed-forwardcontrolwithexternalcompensationFrequencyallowsoptimaloutputfilterselectionoverwideinputInternal2-msDurationSoftStartvoltagerange.
TheUCC25230hasfixedfrequencyVoltageModeControlwithInputFeedForwardsetinternallyat380kHz.
ItalsoincludesinputvoltageAllowsOptimalOutputFilterDesignUVLOandOVLOcomparatorswithhysteresisandinput-good,open-collectoroutputsignalwhichcanbe2%AccuracyInternal2.
5-VReferenceusedtoenablePWMcontrollers.
VDDUVLOUCC25230isavailableinathermallyenhanced8-pinCycle-by-CycleCurrentLimitwithFrequencySONpackagewithPowerPadservingasagroundFoldBackforInitialStartupUnderHighpin.
CapacitiveLoadsOtherfeaturesincludeinternalsoftstartandcycle-by-InputUVLOandOVLOwithInputGoodSignalcyclecurrentprotection.
MeasuredefficiencyofIntegrated110-V,HighandLow-SideSwitchesisolatedconverteroverinputvoltageandoutputcurrentrangesareshowninFigure2.
IsolatedBuckConverter1Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2PowerPad,FlybuckaretrademarksofTexasInstruments.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright2011–2012,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.
Productionprocessingdoesnotnecessarilyincludetestingofallparameters.
UCC25230SLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012www.
ti.
comThisintegratedcircuitcanbedamagedbyESD.
TexasInstrumentsrecommendsthatallintegratedcircuitsbehandledwithappropriateprecautions.
Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.
ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.
Precisionintegratedcircuitsmaybemoresusceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.
ORDERINGINFORMATIONTEMPERATURERANGE,TA=TJPACKAGETAPEANDREELQTY.
PARTNUMBER250UCC25230DRMT-40°Cto+125°CSON-8/S-PVSON-N8(DRM)3000UCC25230DRMRABSOLUTEMAXIMUMRATINGS(1)(2)overoperatingfree-airtemperaturerange(unlessotherwisenoted)MINMAXUNITDC-0.
3100Supplyvoltagerange,VINRepetitivesurge<200ms105DC–0.
3VIN+0.
5OutputvoltageonPHASERepetitivepulse<100ns-2VIN+1VVoltageBOOTwithrespecttoPHASE-0.
310VoltageVDD-0.
310VoltageFB,UV/OV,COMP-0.
3VDDVoltageVIN_G-0.
35.
5HBM2kVESDratingCDM500V220(internallySinkcurrentPHASE(peak)limited)mA-220(internallySourcecurrentPHASE(peak)limited)Operatingvirtualjunctiontemperaturerange,TJ-40150Operatingambienttemperaturerange,TA-40125°CStoragetemperature,TSTG-65150Leadtemperature(soldering,10sec.
)300(1)Stressesbeyondthoselistedunder"absolutemaximumratings"maycausepermanentdamagetothedevice.
Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunder"recommendedoperatingconditions"isnotimplied.
Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.
(2)AllvoltagesarewithrespecttoGND.
Currentsarepositiveinto,negativeoutofthespecifiedterminal.
ConsultPackagingSectionoftheDatabookforthermallimitationsandconsiderationsofpackages.
2SubmitDocumentationFeedbackCopyright2011–2012,TexasInstrumentsIncorporatedProductFolderLink(s):UCC25230UCC25230www.
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comSLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012THERMALINFORMATIONUCC25230THERMALMETRIC(1)DRMUNITS8PINSθJAJunction-to-ambientthermalresistance(2)33.
9θJCtopJunction-to-case(top)thermalresistance(3)33.
2θJBJunction-to-boardthermalresistance(4)11.
4°C/WψJTJunction-to-topcharacterizationparameter(5)0.
4ψJBJunction-to-boardcharacterizationparameter(6)11.
7θJCbotJunction-to-case(bottom)thermalresistance(7)2.
3(1)Formoreinformationabouttraditionalandnewthermalmetrics,seetheICPackageThermalMetricsapplicationreport,SPRA953.
(2)Thejunction-to-ambientthermalresistanceundernaturalconvectionisobtainedinasimulationonaJEDEC-standard,high-Kboard,asspecifiedinJESD51-7,inanenvironmentdescribedinJESD51-2a.
(3)Thejunction-to-case(top)thermalresistanceisobtainedbysimulatingacoldplatetestonthepackagetop.
NospecificJEDEC-standardtestexists,butaclosedescriptioncanbefoundintheANSISEMIstandardG30-88.
(4)Thejunction-to-boardthermalresistanceisobtainedbysimulatinginanenvironmentwitharingcoldplatefixturetocontrolthePCBtemperature,asdescribedinJESD51-8.
(5)Thejunction-to-topcharacterizationparameter,ψJT,estimatesthejunctiontemperatureofadeviceinarealsystemandisextractedfromthesimulationdataforobtainingθJA,usingaproceduredescribedinJESD51-2a(sections6and7).
(6)Thejunction-to-boardcharacterizationparameter,ψJB,estimatesthejunctiontemperatureofadeviceinarealsystemandisextractedfromthesimulationdataforobtainingθJA,usingaproceduredescribedinJESD51-2a(sections6and7).
(7)Thejunction-to-case(bottom)thermalresistanceisobtainedbysimulatingacoldplatetestontheexposed(power)pad.
NospecificJEDECstandardtestexists,butaclosedescriptioncanbefoundintheANSISEMIstandardG30-88.
RECOMMENDEDOPERATINGCONDITIONSoveroperatingfree-airtemperaturerange(unlessotherwisenoted)PARAMETERMINTYPMAXUNIT75,Supplyvoltagerange,VIN1248V(100Vfor1ms)Supplybypasscapacitor,CVIN1.
0μFSupplybypasscapacitor,CVDD0.
11.
02.
2Operatingjunctiontemperaturerange-40+125°CCopyright2011–2012,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3ProductFolderLink(s):UCC25230UCC25230SLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012www.
ti.
comELECTRICALCHARACTERISTICSVIN=48V,1-FcapacitorfromVINtoGND,1-FcapacitorfromVDDtoGND,TA=TJ=-40°Cto125°C,(unlessotherwisenoted)PARAMETERTESTCONDITIONMINTYPMAXUNITSSupplyCurrentsIVINQuiescentcurrentVIN=5V0.
52mAIVINOVINoperatingcurrentFB=COMP4.
510VDDRegulatorVDDVDD,outputvoltage8.
4699.
54VLineregulation17V5V)-2-6-13mAInternalUndervoltageLockout(VDD_UVLO)VDDrisingVDDrisingthreshold7.
07.
58VDDhystVDDthresholdhysteresis0.
40.
71.
1VVDDfallingVDDfallingthreshold6.
36.
87.
3Undervoltage(externalprogrammable)Fallingthreshold0.
91.
01.
1VIhyst71118AOvervoltage(externalprogrammable)OVLORisingthreshold4.
555.
5VIhyst-15-22-40μAVINPowerGOODPGoutputsinkresistanceIPG=5mAto10mA50100ΩOscillatorfOscillatorfrequencyfixed324380445kHzDCMINMinimumdutycycleFB=3.
0V0%DCMAXMaximumdutycycleFB=2.
0V85%Frequencyvariation12Vti.
comSLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012ELECTRICALCHARACTERISTICS(continued)VIN=48V,1-FcapacitorfromVINtoGND,1-FcapacitorfromVDDtoGND,TA=TJ=-40°Cto125°C,(unlessotherwisenoted)PARAMETERTESTCONDITIONMINTYPMAXUNITSErrorAmplifierFB=COMP,(T=25°C)2.
422.
502.
58REFvoltageVFB=COMP,2.
402.
502.
60(T=-40to125°C)AvolAvolopenloopvoltagegain4080dBInputleakagecurrent,FB±2AICOM(sink)COMPsinkcurrentVCOMP=4.
5V24.
810mAICOM(sourcVCOMP=4.
5V-2-6.
1-12COMPsourcecurrente)VOLCOMPvoltagerangeICOMP=100A.
41.
2VVOHCOMPvoltagerangeICOMP=-100AVDD-1.
2VDD-0.
7VDDSoftStartTimeforCOMPtorampFB=COMP1.
752.
052.
35msOutputRDS(on)highVIN=48V615ΩRDS(on)lowVIN=48V510Maxaveragecurrent200mAILIMIT(1)ILIMITphasehighVIN=30V-600-400-220mAPropagationdelay,blankingdelayplusILIMIT60100140nsdelayILIMITphaselowVIN=30V220400600mAPropagationdelay,blankingdelayplusILIMIT60100140nsdelay(2)(1)ContinuedoperationwhileinILIMcouldexceedthemaximumpowerdissipationforthedevice.
ForNon-Isolatedapplicationsadditionalexternalovercurrentprotectionmayberequired.
(2)Specifiedbydesign,notproductiontested.
Copyright2011–2012,TexasInstrumentsIncorporatedSubmitDocumentationFeedback5ProductFolderLink(s):UCC25230UCC25230SLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012www.
ti.
comDEVICEINFORMATIONFigure1.
TERMINALFUNCTIONSTERMINALI/ODESCRIPTIONNAMENO.
PHASE1OPhaseoutputofhigh-sideandlow-sidepowerFETs.
0.
1-FcapacitorconnectedbetweenBOOTandPHASEpinsalongwiththeinternalBOOT2IdiodebetweenBOOTandVDDprovidessupplyvoltagetothedrivecircuitoftheupperpowerFET.
Inputtointernalcomparators.
Internallinearregulatorremainsfunctional.
AbypassUV/OV3Icapofatleast1000pFisrecommended.
VIN_G4OVINpowergood.
Opendrainoutput,statedeterminedbyUV/OVpin.
Erroramplifierinvertinginput.
ConnecttooutputvoltagedividerwithcompensationFB5Icircuittothispin.
COMP(1)6OOutputoferroramplifier.
Outputofinternallinearregulator.
BypassVDDpintoGNDpinsclosetodeviceVDD7Opackagewithahighquality,lowESR1-Fceramiccapacitor.
InputsupplyforthepowerMOSFETswitchesandinternalbiasregulator.
BypassVINVIN8IpinstoGNDpinsclosetodevicepackagewithahighquality,lowESR1-Fceramiccapacitor.
GNDPAD9-Thermalgroundpadandelectricalgroundforthedevice.
(1)InputfeedforwardcontrolwithRAMPmagnitudeVINx6%.
6SubmitDocumentationFeedbackCopyright2011–2012,TexasInstrumentsIncorporatedProductFolderLink(s):UCC25230UCC25230www.
ti.
comSLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012DetailedPinDescriptionPHASE(pin1):OutputoftheinternalhighandlowsidesoftheinternalsynchronousFETS.
Thisoutputdrivestheexternalpowerinductor,orprimarysideofacoupledinductorformultipleoutputs.
BOOT(pin2):Connecta0.
1-FcapacitorbetweentheBOOTpinandthePHASEpin.
ThisprovidesthenecessarylevelshiftvoltagetodrivetheinternalupperFETgate.
UV/OV(pin3):Inputtotheinternalwindowcomparatorwitha1-Vand5-Vreference.
TheinputtotheUV/OVpindeterminesthestateoftheopendrainoutputofVIN_G.
ThisdoesnotdeterminetheoperatingrangeoftheUCC25230.
Abypasscapatleast1000pFisrecommendedfornoiseimmunity.
VIN_G(pin4):OpendrainoutputofTheUCC25230'sinternalcomparator.
TheoutputstateisdeterminedbythevoltageontheUV/OVpin.
TheUCC25230willcontinuetofunctionregardlessofthestateofthispin.
Usedforcontrollingexternalcircuitry.
Maximumvoltagetothispinis5.
5V.
FB(pin5):FBistheinvertinginputoftheUCC25230'sinternalerroramplifier.
Connecttheoutputvoltagesensingdividertothispin.
Internalreferenceis2.
5Vonthenoninvertinginput.
(1)COMP(pin6):TheCOMPpinistheinternalerroramplifier'soutput.
ThevoltagerangeofCOMPis0Vto8.
3V.
Atsteadystate,ahigherCOMPpinvoltageresultsinalargerdutycycle.
AddcompensationcomponentsbetweenthispinandFB.
ThedevicehasinputfeedforwardcontrolwhichmakesPWMRAMPmagnitudeVINx6%.
VDD(pin7):Thisisthe9-VoutputoftheUCC25230'sinternalvoltageregulator.
Thisoutputmaybeusedforpoweringadditionalcircuitry,uptoacurrentof2mA,dependingonthevoltageontheVINpin.
Caremustbetakennottoexceedthedevicestotalpowerdissipation.
VIN(pin8):ThisisthevoltageinputpinfortheUCC25230.
Itsuppliestheinternalvoltageregulatorandoutputswitches.
Bypassthispinwithatleast1-FlowESRcapacitor.
GNDPAD(pin9):GNDPADisthegroundreferenceforthewholedevice.
Tieallsignalreturnstothispoint.
Copyright2011–2012,TexasInstrumentsIncorporatedSubmitDocumentationFeedback7ProductFolderLink(s):UCC25230UCC25230SLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012www.
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comFunctionalBlockDiagram8SubmitDocumentationFeedbackCopyright2011–2012,TexasInstrumentsIncorporatedProductFolderLink(s):UCC25230UCC25230www.
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comSLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012TYPICALCHARACTERISTICSEFFICIENCYOSCILLATORCHANGEvsvsOUTPUTPOWERTEMPERATUREFigure2.
Figure3.
OSCILLATORCHANGESOFT-STARTTIMEvsvsINPUTVOLTAGETEMPERATUREFigure4.
Figure5.
Copyright2011–2012,TexasInstrumentsIncorporatedSubmitDocumentationFeedback9ProductFolderLink(s):UCC25230UCC25230SLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012www.
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comTYPICALCHARACTERISTICS(continued)VDDCHANGEvsTEMPERATUREFigure6.
10SubmitDocumentationFeedbackCopyright2011–2012,TexasInstrumentsIncorporatedProductFolderLink(s):UCC25230UCC25230www.
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comSLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012APPLICATIONINFORMATIONDetailedDescriptionTheUCC25230PWMconverterintegratesallnecessaryfunctionstooperateasanisolatedauxiliarybiassupply.
Itiscapableofoperatingfromaninputvoltagerangeof12Vto100V(upto105-Vsurge),makingitidealforusagein24-Vor48-Vinputtelecomapplications.
High-sideandlow-sidepowerswitchesareintegratedandprovideupto200mAofpeakoutputcurrent.
TheUCC25230isanideal,complementarysolutiontoprimary-sideorsecondary-sidePWMcontrolmethodologiesasitprovidesbiasvoltagesnecessaryforPWMcontrollersand/orexternalperipheralcircuitry.
UCC25230iscapableofdeliveringaprimary-sideand/orsecondary-sidebiasvoltageforpowersupplies.
Assuch,UCC25230isoptimizedforTexasInstruments'familyofUCD3kdigitalandanalogPWMcontrollersaswellastheC2000familyofmicrocontrollers.
UCC25230operatesusingTexasInstruments'FlybuckTopology,whichsimplifiesdesignversusatraditionalflybacktopology.
FlybuckTMTopologyallowsasynchronousbuck–likedesignmethodology.
Italsoenablesasignificantreductioninexternalpartscount,andalsoallowsusageofasmall2-windingtransformer.
TheFlybuckTopologydoesnotrequireathirdtransformerwindingoropto-isolatorforregulation.
Circuitsemployingextratransformerwindingscompromisedynamicresponse,andaddtothetransformer'sphysicalsizeandcost.
TheFlybuckisaportmanteauofflybackandbucksincethetransformerisconnectedasaflybackconverterandtheinputtooutputvoltagerelationshipissimilartoabuckderivedconverter.
Typically,anauxiliarybiassupplymustbedesignedsuchthatitisthefirstdeviceinthesystemtopowerup,andbetheverylastdevice,inthesystem,topowerdown.
Itmustbearobustsupply,beingabletoridethroughanyfaultconditions(OV,UV,OTP,etc)anditalsomustnotprematurelyshutdowntheentirepowersupply.
TheUCC25230wasdesignedwiththesegoalsinmind:A2-mssoftstartensuresasmooth,monotonicstartuponbothprimaryandsecondary-sidevoltages.
Voltagemodewithinputvoltagefeedforwardallowsoptimaloutputfilterdesign.
Cycle-by-cyclecurrentlimitwithfrequencyfoldbackpermitsstartupunderhigh-capacitiveloading.
ProgrammableUV/OVdetectioncircuit.
AVIN_Gfaultoutputprovidesafastpropagationopendrainsignaltoindicatewhenanovervoltageorundervoltageconditionhasbeendetected.
TheUCC25230isspecificallydesignedtoremainoperationalwhenafaultisdetectedinordertoallowforfastexternalshutdown.
Copyright2011–2012,TexasInstrumentsIncorporatedSubmitDocumentationFeedback11ProductFolderLink(s):UCC25230UCC25230SLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012www.
ti.
comOperationoftheFlybuckConverterFigure7showsasimplifiedschematicandthetwoprimaryoperationalstatesoftheFlybuckconverter.
ThepowersupplyisavariationofaFlybackconverterandconsistsofahalfbridgepowerstageSHSandSLS,transformer,primarysidecapacitor,diodeandoutputcapacitor.
Theoutputvoltageisregulatedindirectlybyusingtheprimarysidecapacitorvoltage,VPRI,asfeedback.
TheFlybuckisaportmanteauofflybackandbucksincethetransformerisconnectedasaflybackconverterandtheinputtooutputvoltagerelationshipissimilartoabuckderivedconverter,assumingtheconverterisoperatinginsteadystateandthetransformerhasnegligibleleakageinductance.
TheCPRIandLPRIarechargedbytheinputvoltagesourceVINduringthetimethehighsideswitchSHSison.
Duringthistime,diodeD1isreversedbiasedandtheloadcurrentissuppliedbyoutputcapacitorCO.
DuringtheofftimeofSHS,SLSconductsandthevoltageonCPRIcontinuestoincreaseduringaportionoftheSLSconductiontime.
ThevoltageincreaseisduetotheenergytransferfromLPRItoCPRI.
FortheremainingportionoftheSLSconductiontime,theCPRIvoltagedecreasesbecauseofcurrentinLPRIreverses;seetheILPRIandVPRIwaveformsinFigure8.
Byneglectingthediodevoltagedrop,conductiondeadtimeandleakageinductance,theinputtooutputvoltageconversionratiocanbederivedasshowninEquation2fromthefluxbalanceinLPRI.
ItcanbeseeninEquation2thattheinputtooutputrelationshipisthesameasabuck-derivedconverterwithtransformerisolation.
ThedcvoltageVPRIontheprimarysidecapacitorinEquation3hasthesamelinearrelationshiptotheinputvoltageasabuckconverter.
Figure7.
SimplifiedSchematicwithTwoPrimaryOperationalStates12SubmitDocumentationFeedbackCopyright2011–2012,TexasInstrumentsIncorporatedProductFolderLink(s):UCC25230UCC25230www.
ti.
comSLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012ThesmallsignalmodelfortheFlybuckisderivedbychangingthetransformertotheinductorequivalentandreflectingtheoutputfiltertotheprimarysideforthecircuitshowninFigure7.
Assumingnegligibleleakageinductanceandequivalentseriesresistanceforthecapacitors,theVPRItransferfunctionissimilartothevoltagemodecontrolbuckpowerstagetransferfunctionwiththeexceptionthattheCOandloadareinparallelwiththeCPRIonlyforthe1-Dtime.
ThedevicehasinputfeedforwardcontrolwhichmakesPWMRAMPmagnitudeVINx6%.
(2)spacer(3)Figure8.
SimplifiedVoltageandCurrentWaveformsCopyright2011–2012,TexasInstrumentsIncorporatedSubmitDocumentationFeedback13ProductFolderLink(s):UCC25230UCC25230SLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012www.
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comTypicalApplicationDiagramFigure9.
TypicalApplicationDiagramREVISIONHISTORYChangesfromRevisionA(November,2011)toRevisionBPageAddedIntegrated110-VHighandLow-SideSwitchesfeaturebullet1Addednote,InputfeedforwardcontrolwithRAMPmagnitudeVINx6%6AddedCOMPpindescription,ThedevicehasinputfeedforwardcontrolwhichmakesPWMRAMPmagnitudeVINx6%7DeletedAveragingthesecondarysidecomponents,anapproximatetransferfunctionisshowninandpolelocationin.
ROisthesecondarysideloadresistanceandtheRLMisthedcresistanceoftheprimary.
RiistheinverseoftheComptoPHgm.
13AddedThedevicehasinputfeedforwardcontrolwhichmakesPWMRAMPmagnitudeVINx6%1314SubmitDocumentationFeedbackCopyright2011–2012,TexasInstrumentsIncorporatedProductFolderLink(s):UCC25230PACKAGEOPTIONADDENDUMwww.
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com10-Dec-2020Addendum-Page1PACKAGINGINFORMATIONOrderableDeviceStatus(1)PackageTypePackageDrawingPinsPackageQtyEcoPlan(2)Leadfinish/Ballmaterial(6)MSLPeakTemp(3)OpTemp(°C)DeviceMarking(4/5)SamplesUCC25230DRMRACTIVEVSONDRM83000RoHS&GreenNIPDAUAGLevel-1-260C-UNLIM-40to12525230UCC25230DRMTACTIVEVSONDRM8250RoHS&GreenNIPDAUAGLevel-1-260C-UNLIM-40to12525230(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.
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Effortsareunderwaytobetterintegrateinformationfromthirdparties.
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InnoeventshallTI'sliabilityarisingoutofsuchinformationexceedthetotalpurchasepriceoftheTIpart(s)atissueinthisdocumentsoldbyTItoCustomeronanannualbasis.
PACKAGEOPTIONADDENDUMwww.
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com10-Dec-2020Addendum-Page2TAPEANDREELINFORMATION*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQReelDiameter(mm)ReelWidthW1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W(mm)Pin1QuadrantUCC25230DRMRVSONDRM83000330.
012.
44.
254.
251.
158.
012.
0Q2UCC25230DRMTVSONDRM8250180.
012.
44.
254.
251.
158.
012.
0Q2PACKAGEMATERIALSINFORMATIONwww.
ti.
com18-Nov-2020PackMaterials-Page1*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQLength(mm)Width(mm)Height(mm)UCC25230DRMRVSONDRM83000853.
0449.
035.
0UCC25230DRMTVSONDRM8250210.
0185.
035.
0PACKAGEMATERIALSINFORMATIONwww.
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com18-Nov-2020PackMaterials-Page2IMPORTANTNOTICEANDDISCLAIMERTIPROVIDESTECHNICALANDRELIABILITYDATA(INCLUDINGDATASHEETS),DESIGNRESOURCES(INCLUDINGREFERENCEDESIGNS),APPLICATIONOROTHERDESIGNADVICE,WEBTOOLS,SAFETYINFORMATION,ANDOTHERRESOURCES"ASIS"ANDWITHALLFAULTS,ANDDISCLAIMSALLWARRANTIES,EXPRESSANDIMPLIED,INCLUDINGWITHOUTLIMITATIONANYIMPLIEDWARRANTIESOFMERCHANTABILITY,FITNESSFORAPARTICULARPURPOSEORNON-INFRINGEMENTOFTHIRDPARTYINTELLECTUALPROPERTYRIGHTS.
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MailingAddress:TexasInstruments,PostOfficeBox655303,Dallas,Texas75265Copyright2020,TexasInstrumentsIncorporated
ti.
comSLUSAQ6B–NOVEMBER2011–REVISEDAPRIL201212-Vto100-VInput,0.
2-AOutputSwitchingConverterCheckforSamples:UCC252301FEATURESAPPLICATIONS2HighlyIntegratedConverterOperatingasaHighDensityIsolatedStandbyBiasSuppliesBuck,orIsolatedForward-Flyback,FlybuckDC-to-DCConvertersWideOperatingInputVoltageRangefrom12Vto100V,105-VSurge.
DESCRIPTIONTheUCC25230isahighlyintegratedPWMconverterUpto0.
2-AOutputCurrentoperatingasanisolatedforwardflyback.
Ithashigh-9-VAlwaysAvailableVDDOutputwithupto2-sideandlow-sidepowerswitchesintegratedandthemACurrentCapabilitycontrolcircuitwithallkeyconverterfunctionsThermallyEnhanced4-mmx4-mmSON-8/S-included.
Thepowerstagerequiresonlyone-orPVSON-N8(DRM)Packagemultiplewindingcoupledinductorandoutputcapacitorsforthecompletesolution.
Voltage-modeInternallySetFixed380-kHzSwitchingfeed-forwardcontrolwithexternalcompensationFrequencyallowsoptimaloutputfilterselectionoverwideinputInternal2-msDurationSoftStartvoltagerange.
TheUCC25230hasfixedfrequencyVoltageModeControlwithInputFeedForwardsetinternallyat380kHz.
ItalsoincludesinputvoltageAllowsOptimalOutputFilterDesignUVLOandOVLOcomparatorswithhysteresisandinput-good,open-collectoroutputsignalwhichcanbe2%AccuracyInternal2.
5-VReferenceusedtoenablePWMcontrollers.
VDDUVLOUCC25230isavailableinathermallyenhanced8-pinCycle-by-CycleCurrentLimitwithFrequencySONpackagewithPowerPadservingasagroundFoldBackforInitialStartupUnderHighpin.
CapacitiveLoadsOtherfeaturesincludeinternalsoftstartandcycle-by-InputUVLOandOVLOwithInputGoodSignalcyclecurrentprotection.
MeasuredefficiencyofIntegrated110-V,HighandLow-SideSwitchesisolatedconverteroverinputvoltageandoutputcurrentrangesareshowninFigure2.
IsolatedBuckConverter1Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2PowerPad,FlybuckaretrademarksofTexasInstruments.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright2011–2012,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.
Productionprocessingdoesnotnecessarilyincludetestingofallparameters.
UCC25230SLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012www.
ti.
comThisintegratedcircuitcanbedamagedbyESD.
TexasInstrumentsrecommendsthatallintegratedcircuitsbehandledwithappropriateprecautions.
Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.
ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.
Precisionintegratedcircuitsmaybemoresusceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.
ORDERINGINFORMATIONTEMPERATURERANGE,TA=TJPACKAGETAPEANDREELQTY.
PARTNUMBER250UCC25230DRMT-40°Cto+125°CSON-8/S-PVSON-N8(DRM)3000UCC25230DRMRABSOLUTEMAXIMUMRATINGS(1)(2)overoperatingfree-airtemperaturerange(unlessotherwisenoted)MINMAXUNITDC-0.
3100Supplyvoltagerange,VINRepetitivesurge<200ms105DC–0.
3VIN+0.
5OutputvoltageonPHASERepetitivepulse<100ns-2VIN+1VVoltageBOOTwithrespecttoPHASE-0.
310VoltageVDD-0.
310VoltageFB,UV/OV,COMP-0.
3VDDVoltageVIN_G-0.
35.
5HBM2kVESDratingCDM500V220(internallySinkcurrentPHASE(peak)limited)mA-220(internallySourcecurrentPHASE(peak)limited)Operatingvirtualjunctiontemperaturerange,TJ-40150Operatingambienttemperaturerange,TA-40125°CStoragetemperature,TSTG-65150Leadtemperature(soldering,10sec.
)300(1)Stressesbeyondthoselistedunder"absolutemaximumratings"maycausepermanentdamagetothedevice.
Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunder"recommendedoperatingconditions"isnotimplied.
Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.
(2)AllvoltagesarewithrespecttoGND.
Currentsarepositiveinto,negativeoutofthespecifiedterminal.
ConsultPackagingSectionoftheDatabookforthermallimitationsandconsiderationsofpackages.
2SubmitDocumentationFeedbackCopyright2011–2012,TexasInstrumentsIncorporatedProductFolderLink(s):UCC25230UCC25230www.
ti.
comSLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012THERMALINFORMATIONUCC25230THERMALMETRIC(1)DRMUNITS8PINSθJAJunction-to-ambientthermalresistance(2)33.
9θJCtopJunction-to-case(top)thermalresistance(3)33.
2θJBJunction-to-boardthermalresistance(4)11.
4°C/WψJTJunction-to-topcharacterizationparameter(5)0.
4ψJBJunction-to-boardcharacterizationparameter(6)11.
7θJCbotJunction-to-case(bottom)thermalresistance(7)2.
3(1)Formoreinformationabouttraditionalandnewthermalmetrics,seetheICPackageThermalMetricsapplicationreport,SPRA953.
(2)Thejunction-to-ambientthermalresistanceundernaturalconvectionisobtainedinasimulationonaJEDEC-standard,high-Kboard,asspecifiedinJESD51-7,inanenvironmentdescribedinJESD51-2a.
(3)Thejunction-to-case(top)thermalresistanceisobtainedbysimulatingacoldplatetestonthepackagetop.
NospecificJEDEC-standardtestexists,butaclosedescriptioncanbefoundintheANSISEMIstandardG30-88.
(4)Thejunction-to-boardthermalresistanceisobtainedbysimulatinginanenvironmentwitharingcoldplatefixturetocontrolthePCBtemperature,asdescribedinJESD51-8.
(5)Thejunction-to-topcharacterizationparameter,ψJT,estimatesthejunctiontemperatureofadeviceinarealsystemandisextractedfromthesimulationdataforobtainingθJA,usingaproceduredescribedinJESD51-2a(sections6and7).
(6)Thejunction-to-boardcharacterizationparameter,ψJB,estimatesthejunctiontemperatureofadeviceinarealsystemandisextractedfromthesimulationdataforobtainingθJA,usingaproceduredescribedinJESD51-2a(sections6and7).
(7)Thejunction-to-case(bottom)thermalresistanceisobtainedbysimulatingacoldplatetestontheexposed(power)pad.
NospecificJEDECstandardtestexists,butaclosedescriptioncanbefoundintheANSISEMIstandardG30-88.
RECOMMENDEDOPERATINGCONDITIONSoveroperatingfree-airtemperaturerange(unlessotherwisenoted)PARAMETERMINTYPMAXUNIT75,Supplyvoltagerange,VIN1248V(100Vfor1ms)Supplybypasscapacitor,CVIN1.
0μFSupplybypasscapacitor,CVDD0.
11.
02.
2Operatingjunctiontemperaturerange-40+125°CCopyright2011–2012,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3ProductFolderLink(s):UCC25230UCC25230SLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012www.
ti.
comELECTRICALCHARACTERISTICSVIN=48V,1-FcapacitorfromVINtoGND,1-FcapacitorfromVDDtoGND,TA=TJ=-40°Cto125°C,(unlessotherwisenoted)PARAMETERTESTCONDITIONMINTYPMAXUNITSSupplyCurrentsIVINQuiescentcurrentVIN=5V0.
52mAIVINOVINoperatingcurrentFB=COMP4.
510VDDRegulatorVDDVDD,outputvoltage8.
4699.
54VLineregulation17V
07.
58VDDhystVDDthresholdhysteresis0.
40.
71.
1VVDDfallingVDDfallingthreshold6.
36.
87.
3Undervoltage(externalprogrammable)Fallingthreshold0.
91.
01.
1VIhyst71118AOvervoltage(externalprogrammable)OVLORisingthreshold4.
555.
5VIhyst-15-22-40μAVINPowerGOODPGoutputsinkresistanceIPG=5mAto10mA50100ΩOscillatorfOscillatorfrequencyfixed324380445kHzDCMINMinimumdutycycleFB=3.
0V0%DCMAXMaximumdutycycleFB=2.
0V85%Frequencyvariation12V
comSLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012ELECTRICALCHARACTERISTICS(continued)VIN=48V,1-FcapacitorfromVINtoGND,1-FcapacitorfromVDDtoGND,TA=TJ=-40°Cto125°C,(unlessotherwisenoted)PARAMETERTESTCONDITIONMINTYPMAXUNITSErrorAmplifierFB=COMP,(T=25°C)2.
422.
502.
58REFvoltageVFB=COMP,2.
402.
502.
60(T=-40to125°C)AvolAvolopenloopvoltagegain4080dBInputleakagecurrent,FB±2AICOM(sink)COMPsinkcurrentVCOMP=4.
5V24.
810mAICOM(sourcVCOMP=4.
5V-2-6.
1-12COMPsourcecurrente)VOLCOMPvoltagerangeICOMP=100A.
41.
2VVOHCOMPvoltagerangeICOMP=-100AVDD-1.
2VDD-0.
7VDDSoftStartTimeforCOMPtorampFB=COMP1.
752.
052.
35msOutputRDS(on)highVIN=48V615ΩRDS(on)lowVIN=48V510Maxaveragecurrent200mAILIMIT(1)ILIMITphasehighVIN=30V-600-400-220mAPropagationdelay,blankingdelayplusILIMIT60100140nsdelayILIMITphaselowVIN=30V220400600mAPropagationdelay,blankingdelayplusILIMIT60100140nsdelay(2)(1)ContinuedoperationwhileinILIMcouldexceedthemaximumpowerdissipationforthedevice.
ForNon-Isolatedapplicationsadditionalexternalovercurrentprotectionmayberequired.
(2)Specifiedbydesign,notproductiontested.
Copyright2011–2012,TexasInstrumentsIncorporatedSubmitDocumentationFeedback5ProductFolderLink(s):UCC25230UCC25230SLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012www.
ti.
comDEVICEINFORMATIONFigure1.
TERMINALFUNCTIONSTERMINALI/ODESCRIPTIONNAMENO.
PHASE1OPhaseoutputofhigh-sideandlow-sidepowerFETs.
0.
1-FcapacitorconnectedbetweenBOOTandPHASEpinsalongwiththeinternalBOOT2IdiodebetweenBOOTandVDDprovidessupplyvoltagetothedrivecircuitoftheupperpowerFET.
Inputtointernalcomparators.
Internallinearregulatorremainsfunctional.
AbypassUV/OV3Icapofatleast1000pFisrecommended.
VIN_G4OVINpowergood.
Opendrainoutput,statedeterminedbyUV/OVpin.
Erroramplifierinvertinginput.
ConnecttooutputvoltagedividerwithcompensationFB5Icircuittothispin.
COMP(1)6OOutputoferroramplifier.
Outputofinternallinearregulator.
BypassVDDpintoGNDpinsclosetodeviceVDD7Opackagewithahighquality,lowESR1-Fceramiccapacitor.
InputsupplyforthepowerMOSFETswitchesandinternalbiasregulator.
BypassVINVIN8IpinstoGNDpinsclosetodevicepackagewithahighquality,lowESR1-Fceramiccapacitor.
GNDPAD9-Thermalgroundpadandelectricalgroundforthedevice.
(1)InputfeedforwardcontrolwithRAMPmagnitudeVINx6%.
6SubmitDocumentationFeedbackCopyright2011–2012,TexasInstrumentsIncorporatedProductFolderLink(s):UCC25230UCC25230www.
ti.
comSLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012DetailedPinDescriptionPHASE(pin1):OutputoftheinternalhighandlowsidesoftheinternalsynchronousFETS.
Thisoutputdrivestheexternalpowerinductor,orprimarysideofacoupledinductorformultipleoutputs.
BOOT(pin2):Connecta0.
1-FcapacitorbetweentheBOOTpinandthePHASEpin.
ThisprovidesthenecessarylevelshiftvoltagetodrivetheinternalupperFETgate.
UV/OV(pin3):Inputtotheinternalwindowcomparatorwitha1-Vand5-Vreference.
TheinputtotheUV/OVpindeterminesthestateoftheopendrainoutputofVIN_G.
ThisdoesnotdeterminetheoperatingrangeoftheUCC25230.
Abypasscapatleast1000pFisrecommendedfornoiseimmunity.
VIN_G(pin4):OpendrainoutputofTheUCC25230'sinternalcomparator.
TheoutputstateisdeterminedbythevoltageontheUV/OVpin.
TheUCC25230willcontinuetofunctionregardlessofthestateofthispin.
Usedforcontrollingexternalcircuitry.
Maximumvoltagetothispinis5.
5V.
FB(pin5):FBistheinvertinginputoftheUCC25230'sinternalerroramplifier.
Connecttheoutputvoltagesensingdividertothispin.
Internalreferenceis2.
5Vonthenoninvertinginput.
(1)COMP(pin6):TheCOMPpinistheinternalerroramplifier'soutput.
ThevoltagerangeofCOMPis0Vto8.
3V.
Atsteadystate,ahigherCOMPpinvoltageresultsinalargerdutycycle.
AddcompensationcomponentsbetweenthispinandFB.
ThedevicehasinputfeedforwardcontrolwhichmakesPWMRAMPmagnitudeVINx6%.
VDD(pin7):Thisisthe9-VoutputoftheUCC25230'sinternalvoltageregulator.
Thisoutputmaybeusedforpoweringadditionalcircuitry,uptoacurrentof2mA,dependingonthevoltageontheVINpin.
Caremustbetakennottoexceedthedevicestotalpowerdissipation.
VIN(pin8):ThisisthevoltageinputpinfortheUCC25230.
Itsuppliestheinternalvoltageregulatorandoutputswitches.
Bypassthispinwithatleast1-FlowESRcapacitor.
GNDPAD(pin9):GNDPADisthegroundreferenceforthewholedevice.
Tieallsignalreturnstothispoint.
Copyright2011–2012,TexasInstrumentsIncorporatedSubmitDocumentationFeedback7ProductFolderLink(s):UCC25230UCC25230SLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012www.
ti.
comFunctionalBlockDiagram8SubmitDocumentationFeedbackCopyright2011–2012,TexasInstrumentsIncorporatedProductFolderLink(s):UCC25230UCC25230www.
ti.
comSLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012TYPICALCHARACTERISTICSEFFICIENCYOSCILLATORCHANGEvsvsOUTPUTPOWERTEMPERATUREFigure2.
Figure3.
OSCILLATORCHANGESOFT-STARTTIMEvsvsINPUTVOLTAGETEMPERATUREFigure4.
Figure5.
Copyright2011–2012,TexasInstrumentsIncorporatedSubmitDocumentationFeedback9ProductFolderLink(s):UCC25230UCC25230SLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012www.
ti.
comTYPICALCHARACTERISTICS(continued)VDDCHANGEvsTEMPERATUREFigure6.
10SubmitDocumentationFeedbackCopyright2011–2012,TexasInstrumentsIncorporatedProductFolderLink(s):UCC25230UCC25230www.
ti.
comSLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012APPLICATIONINFORMATIONDetailedDescriptionTheUCC25230PWMconverterintegratesallnecessaryfunctionstooperateasanisolatedauxiliarybiassupply.
Itiscapableofoperatingfromaninputvoltagerangeof12Vto100V(upto105-Vsurge),makingitidealforusagein24-Vor48-Vinputtelecomapplications.
High-sideandlow-sidepowerswitchesareintegratedandprovideupto200mAofpeakoutputcurrent.
TheUCC25230isanideal,complementarysolutiontoprimary-sideorsecondary-sidePWMcontrolmethodologiesasitprovidesbiasvoltagesnecessaryforPWMcontrollersand/orexternalperipheralcircuitry.
UCC25230iscapableofdeliveringaprimary-sideand/orsecondary-sidebiasvoltageforpowersupplies.
Assuch,UCC25230isoptimizedforTexasInstruments'familyofUCD3kdigitalandanalogPWMcontrollersaswellastheC2000familyofmicrocontrollers.
UCC25230operatesusingTexasInstruments'FlybuckTopology,whichsimplifiesdesignversusatraditionalflybacktopology.
FlybuckTMTopologyallowsasynchronousbuck–likedesignmethodology.
Italsoenablesasignificantreductioninexternalpartscount,andalsoallowsusageofasmall2-windingtransformer.
TheFlybuckTopologydoesnotrequireathirdtransformerwindingoropto-isolatorforregulation.
Circuitsemployingextratransformerwindingscompromisedynamicresponse,andaddtothetransformer'sphysicalsizeandcost.
TheFlybuckisaportmanteauofflybackandbucksincethetransformerisconnectedasaflybackconverterandtheinputtooutputvoltagerelationshipissimilartoabuckderivedconverter.
Typically,anauxiliarybiassupplymustbedesignedsuchthatitisthefirstdeviceinthesystemtopowerup,andbetheverylastdevice,inthesystem,topowerdown.
Itmustbearobustsupply,beingabletoridethroughanyfaultconditions(OV,UV,OTP,etc)anditalsomustnotprematurelyshutdowntheentirepowersupply.
TheUCC25230wasdesignedwiththesegoalsinmind:A2-mssoftstartensuresasmooth,monotonicstartuponbothprimaryandsecondary-sidevoltages.
Voltagemodewithinputvoltagefeedforwardallowsoptimaloutputfilterdesign.
Cycle-by-cyclecurrentlimitwithfrequencyfoldbackpermitsstartupunderhigh-capacitiveloading.
ProgrammableUV/OVdetectioncircuit.
AVIN_Gfaultoutputprovidesafastpropagationopendrainsignaltoindicatewhenanovervoltageorundervoltageconditionhasbeendetected.
TheUCC25230isspecificallydesignedtoremainoperationalwhenafaultisdetectedinordertoallowforfastexternalshutdown.
Copyright2011–2012,TexasInstrumentsIncorporatedSubmitDocumentationFeedback11ProductFolderLink(s):UCC25230UCC25230SLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012www.
ti.
comOperationoftheFlybuckConverterFigure7showsasimplifiedschematicandthetwoprimaryoperationalstatesoftheFlybuckconverter.
ThepowersupplyisavariationofaFlybackconverterandconsistsofahalfbridgepowerstageSHSandSLS,transformer,primarysidecapacitor,diodeandoutputcapacitor.
Theoutputvoltageisregulatedindirectlybyusingtheprimarysidecapacitorvoltage,VPRI,asfeedback.
TheFlybuckisaportmanteauofflybackandbucksincethetransformerisconnectedasaflybackconverterandtheinputtooutputvoltagerelationshipissimilartoabuckderivedconverter,assumingtheconverterisoperatinginsteadystateandthetransformerhasnegligibleleakageinductance.
TheCPRIandLPRIarechargedbytheinputvoltagesourceVINduringthetimethehighsideswitchSHSison.
Duringthistime,diodeD1isreversedbiasedandtheloadcurrentissuppliedbyoutputcapacitorCO.
DuringtheofftimeofSHS,SLSconductsandthevoltageonCPRIcontinuestoincreaseduringaportionoftheSLSconductiontime.
ThevoltageincreaseisduetotheenergytransferfromLPRItoCPRI.
FortheremainingportionoftheSLSconductiontime,theCPRIvoltagedecreasesbecauseofcurrentinLPRIreverses;seetheILPRIandVPRIwaveformsinFigure8.
Byneglectingthediodevoltagedrop,conductiondeadtimeandleakageinductance,theinputtooutputvoltageconversionratiocanbederivedasshowninEquation2fromthefluxbalanceinLPRI.
ItcanbeseeninEquation2thattheinputtooutputrelationshipisthesameasabuck-derivedconverterwithtransformerisolation.
ThedcvoltageVPRIontheprimarysidecapacitorinEquation3hasthesamelinearrelationshiptotheinputvoltageasabuckconverter.
Figure7.
SimplifiedSchematicwithTwoPrimaryOperationalStates12SubmitDocumentationFeedbackCopyright2011–2012,TexasInstrumentsIncorporatedProductFolderLink(s):UCC25230UCC25230www.
ti.
comSLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012ThesmallsignalmodelfortheFlybuckisderivedbychangingthetransformertotheinductorequivalentandreflectingtheoutputfiltertotheprimarysideforthecircuitshowninFigure7.
Assumingnegligibleleakageinductanceandequivalentseriesresistanceforthecapacitors,theVPRItransferfunctionissimilartothevoltagemodecontrolbuckpowerstagetransferfunctionwiththeexceptionthattheCOandloadareinparallelwiththeCPRIonlyforthe1-Dtime.
ThedevicehasinputfeedforwardcontrolwhichmakesPWMRAMPmagnitudeVINx6%.
(2)spacer(3)Figure8.
SimplifiedVoltageandCurrentWaveformsCopyright2011–2012,TexasInstrumentsIncorporatedSubmitDocumentationFeedback13ProductFolderLink(s):UCC25230UCC25230SLUSAQ6B–NOVEMBER2011–REVISEDAPRIL2012www.
ti.
comTypicalApplicationDiagramFigure9.
TypicalApplicationDiagramREVISIONHISTORYChangesfromRevisionA(November,2011)toRevisionBPageAddedIntegrated110-VHighandLow-SideSwitchesfeaturebullet1Addednote,InputfeedforwardcontrolwithRAMPmagnitudeVINx6%6AddedCOMPpindescription,ThedevicehasinputfeedforwardcontrolwhichmakesPWMRAMPmagnitudeVINx6%7DeletedAveragingthesecondarysidecomponents,anapproximatetransferfunctionisshowninandpolelocationin.
ROisthesecondarysideloadresistanceandtheRLMisthedcresistanceoftheprimary.
RiistheinverseoftheComptoPHgm.
13AddedThedevicehasinputfeedforwardcontrolwhichmakesPWMRAMPmagnitudeVINx6%1314SubmitDocumentationFeedbackCopyright2011–2012,TexasInstrumentsIncorporatedProductFolderLink(s):UCC25230PACKAGEOPTIONADDENDUMwww.
ti.
com10-Dec-2020Addendum-Page1PACKAGINGINFORMATIONOrderableDeviceStatus(1)PackageTypePackageDrawingPinsPackageQtyEcoPlan(2)Leadfinish/Ballmaterial(6)MSLPeakTemp(3)OpTemp(°C)DeviceMarking(4/5)SamplesUCC25230DRMRACTIVEVSONDRM83000RoHS&GreenNIPDAUAGLevel-1-260C-UNLIM-40to12525230UCC25230DRMTACTIVEVSONDRM8250RoHS&GreenNIPDAUAGLevel-1-260C-UNLIM-40to12525230(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-Page2TAPEANDREELINFORMATION*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQReelDiameter(mm)ReelWidthW1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W(mm)Pin1QuadrantUCC25230DRMRVSONDRM83000330.
012.
44.
254.
251.
158.
012.
0Q2UCC25230DRMTVSONDRM8250180.
012.
44.
254.
251.
158.
012.
0Q2PACKAGEMATERIALSINFORMATIONwww.
ti.
com18-Nov-2020PackMaterials-Page1*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQLength(mm)Width(mm)Height(mm)UCC25230DRMRVSONDRM83000853.
0449.
035.
0UCC25230DRMTVSONDRM8250210.
0185.
035.
0PACKAGEMATERIALSINFORMATIONwww.
ti.
com18-Nov-2020PackMaterials-Page2IMPORTANTNOTICEANDDISCLAIMERTIPROVIDESTECHNICALANDRELIABILITYDATA(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.
TIgrantsyoupermissiontousetheseresourcesonlyfordevelopmentofanapplicationthatusestheTIproductsdescribedintheresource.
Otherreproductionanddisplayoftheseresourcesisprohibited.
NolicenseisgrantedtoanyotherTIintellectualpropertyrightortoanythirdpartyintellectualpropertyright.
TIdisclaimsresponsibilityfor,andyouwillfullyindemnifyTIanditsrepresentativesagainst,anyclaims,damages,costs,losses,andliabilitiesarisingoutofyouruseoftheseresources.
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comorprovidedinconjunctionwithsuchTIproducts.
TI'sprovisionoftheseresourcesdoesnotexpandorotherwisealterTI'sapplicablewarrantiesorwarrantydisclaimersforTIproducts.
MailingAddress:TexasInstruments,PostOfficeBox655303,Dallas,Texas75265Copyright2020,TexasInstrumentsIncorporated
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