UCC28740 Constant-Voltage Constant-Current …

1 4 V 5%VOCVO utput Current (IO)Output voltage (VO)3 V2 V1 VVDDVSFBHVDRVCSGNDUCC28740 SOIC-7 CVDDRS1 VAUXNARS2 RLCRCSVBULKCB2CB1+ VACNPNSVOUTCOUTRTLRFB1 RFB2 ZFBC opyright 2017, texas instruments IncorporatedProductFolderOrderNowTechnic alDocumentsTools &SoftwareSupport &CommunityAn IMPORTANTNOTICEat the end of this datasheetaddressesavailability,warranty, changes,use in safety-criticalapplications,intellectual propertymattersand JULY2013 REVISEDJULY2017 UCC28740 Constant-VoltageConstant-CurrentFlybackC ontrollerUsingOptocoupledFeedback11 Features1 Lessthan10-mWNo-LoadPowerCapability OptocoupledFeedbackfor CV, andPrimary-SideRegulation(PSR)

2 For CC Enables 1% VoltageRegulationand 5%CurrentRegulationAcrossLine and Load 700-VStartupSwitch 100-kHzMaximumSwitchingFrequencyEnablesH igh-Power-DensityChargerDesigns Resonant-RingValley-SwitchingOperationfo rHighestOverallEfficiency FrequencyDitheringto EaseEMI Compliance ClampedGate-DriveOutputfor MOSFET Overvoltage,Low-Line,and OvercurrentProtectionFunctions SOIC-7 Package Createa CustomDesignUsingthe UCC28740 Withthe WEBENCH PowerDesigner2 Applications USB-CompliantAdaptersand ChargersforConsumerElectronics SmartPhones TabletComputers Cameras StandbySupplyfor TV and Desktop WhiteGoods3 DescriptionTheUCC28740isolated-flybackpo wer-supplycontrollerprovidesConstant-Vol tage(CV)usinganopticalcouplerto improvetransientresponseto (CC)regulationisaccomplishedthroughPrima ry-SideRegulation(PSR)

3 Auxiliaryflybackwindingfor precisehigh-performancecontrolofoutputvo ltageand ,dynamicallycontrolledoperatingstates,an d a tailoredmodulationprofilesupportultra-lo wstandbypowerwithoutsacrificingstartupti me or the UCC28740allowoperatingefficienciesto meetor a (DCM) switchingfrequencyandprimarycurrent-peak amplitude(FMandAM)keepstheconversioneffi ciencyhigh acrossthe entireload and line controllerhas a maximumswitchingfrequencyof100 kHz and alwaysmaintainscontrolof the peak-primarycurrentin the minimumswitchingfrequencyof 170 Hzfacilitatesthe achievementof lessthan10-mWno-load (1)PARTNUMBERPACKAGEBODYSIZE(NOM)UCC2874 0 SOIC(7) (1) For all availablepackages,see the orderableaddendumatthe end of the Diagram2 UCC28740 SLUSBF3C JULY2013.

4 UCC28740 SubmitDocumentationFeedbackCopyright 2013 2017,TexasInstrumentsIncorporatedTableof Contents1 Pin Configurationand Applicationand Deviceand Mechanical,Packaging,and RevisionHistoryNOTE:Pagenumbersfor previousrevisionsmay differfrompagenumbersin the (December2014)to RevisionCPage Movedthe timingparametersfromtheElectricalCharact eristicstableto Deletedquasifromquasi-resonantin theTransformerTurnsRatio,Inductance, AddedtheDevelopmentSupport,Documentation Support,ReceivingNotificationof DocumentationUpdates, (July2013)

5 To RevisionBPage AddedESDR atingstable,FeatureDescriptionsection,De viceFunctionalModes,Applicationand Implementationsection,PowerSupplyRecomme ndationssection,Layoutsection,Deviceand DocumentationSupportsection,andMechanica l,Packaging,and (July2013)to RevisionAPage ChangedmarketingstatusfromProductPreview to JULY2013 REVISEDJULY2017 ProductFolderLinks: UCC28740 SubmitDocumentationFeedbackCopyright 2013 2017,TexasInstrumentsIncorporated5 Pin Configurationand FunctionsD Package7-PinSOICTop ViewPin current-sense(CS)inputconnectsto a ground-referencedcurrent-senseresistorin serieswith the resultingvoltagemonitorsand controlsthe seriesresistoris addedto thispin to compensatefor peakswitch-currentlevelsas the (DRV)is an outputthat drivesthe gateof an feedback(FB)

6 Inputreceivesa currentsignalfromthe internalcurrentmirrordividesthe feedbackcurrentby and appliesit to an internalpullupresistorto generatea controlvoltage,VCL. The voltageat this resistordirectlydrivesthe controllaw function,whichdeterminesthe switchingfrequencyand the peakamplitudeof the The ground(GND)pin is boththe referencepin for the controller,and the low-sidereturnfor the takento returnall AC-decouplingcapacitorsas closeas possibleto this pin and avoidanycommontracelengthwith high- voltage (HV)pin may connectdirectly,or througha seriesresistor,to the rectifiedbulk voltageandprovidesa chargeto the VDDcapacitorfor the startupof the the bias-supplyinputpin to the carefullyplacedbypasscapacitorto GNDis requiredon (VS)

7 Is an inputusedto providedemagnetizationtimingfeedbackto the controllerto limitfrequency,to controlconstant-currentoperation,and to is also usedforAC-mainsinput-voltagedetectionfor pin connectsto a voltagedividerbetweenan auxiliarywindingand valueof the upperresistorof this dividerprogramsthe AC-mainsrun and stop thresholds,and factorsinto line compensationat the CS JULY2013 : UCC28740 SubmitDocumentationFeedbackCopyright 2013 2017,TexasInstrumentsIncorporated(1)Stre ssesbeyondthoselistedunderAbsoluteMaximu mRatingsmay causepermanentdamageto the stressratingsonly and functionaloperationof the deviceat theseor any otherconditionsbeyondthoseindicatedunder RecommendedOperatingConditionsis not absolute-maximum-ratedconditionsfor extendedperiodsmay affectdevicereliability.

8 (2)All voltagesare with respectto positiveinto, negativeout of the (1)and(2).MINMAXUNITVHVS tart-uppin voltage ,HV700 VVVDDB iassupplyvoltage,VDD38 VIDRVC ontinuousgate-currentsink50mAIDRVC ontinuousgate-currentsourceSelf-limiting mAIFBP eakcurrent,VS1mAIVSP eakcurrent,FB DRV ,CS ,FB ,VS 55150 CTstgStoragetemperature 65150 C(1)JEDEC documentJEP155statesthat 500-VHBM allowssafe manufacturingwith a standardESDcontrolprocess.(2)JEDEC documentJEP157statesthat 250-VCDM allowssafe manufacturingwith a (ESD)ElectrostaticdischargeHuman-bodymod el(HBM),per ANSI/ESDA/JEDECJS-001(1) 2000 VCharged-devicemodel(CDM),per JEDEC specificationJESD22-C101(2) (unlessotherwisenoted) FIFBF eedbackcurrent,continuous50 AIVSVS pin current,out of pin1mATJO peratingjunctiontemperature 40125 C(1)For moreinformationabouttraditionaland new thermalmetrics,see theSemiconductorand IC (1) UCC28740 UNITD (SOIC)7 PINSR C/WR JC(top)Junction-to-case(top)

9 C/WR JBJunction-to-boardthermalresistance89 C/W C/W JULY2013 REVISEDJULY2017 ProductFolderLinks: UCC28740 SubmitDocumentationFeedbackCopyright 2013 2017,TexasInstrumentsIncorporated(1)This deviceautomaticallyvariesthe controlfrequencyand currentsensethresholdsto improveEMI frequencylimitsrepresentaveragelevels.(2 )The overvoltagethresholdlevelat VS decreaseswith increasingtemperatureby mV/ C. This compensationis includedto ,VVDD= 25 V, HV = open,VFB= 0 V, VVS= 4 V, TA= 40 C to +125 C, TJ= TA(unlessotherwisenoted)PARAMETERTESTCON DITIONSMINTYPMAXUNITHIGH-VOLTAGESTARTUPI HVS tart-upcurrentout of VDDVHV= 100 V, VVDD= 0 V, startstate100250500 AIHVLKG25 Leakagecurrentat HVVHV= 400 V, run state,TJ= 25 ABIASSUPPLYINPUTIRUNS upplycurrent,runIDRV= 0, run ,waitIDRV= 0, wait state95125 AISTARTS upplycurrent,startIDRV= 0, VVDD= 18 V, startstate,IHV= 01830 AIFAULTS upplycurrent,faultIDRV= 0, fault state95130 AUNDERVOLTAGELOCKOUTVVDD(on)VDDturnonthr esholdVVDDlow to high192123 VVVDD(off)

10 VDDturnoffthresholdVVDD high to INPUTVVSNCN egativeclamplevelIVSLS= 300 A, voltsbelowground190250325mVIVSBI nputbias currentVVS= 4 V AFB INPUTIFBMAXFull-rangeinputcurrentfSW= fSW(min)162330 AVFBMAXI nputvoltageat full rangeIFB= 25 A, TJ= 25 ,linearized IFB= 20 A, centeredat IFB= 15 A, TJ=25 C101418k CS INPUTVCST(max)MaximumCS thresholdvoltageIFB= 0 A(1)738773810mVVCST(min)MinimumCS thresholdvoltageIFB= 35 A(1)170194215mVKAMAM-controlratioVCST(ma x)/ VCST(min) 300 A, IVSLS/ currentout of CS ,VCS= 1 V180230280nsDRIVERSIDRSDRV sourcecurrentVDRV= 8 V, VVDD= 9 V2025mARDRVLSDRVlow-sidedriveresistanceI DRV= 10 mA612 VDRCLDRV clampvoltageVVDD= 35 V1416 VRDRVSSDRV pulldownin start-state150190230k PROTECTIONVOVPO vervoltagethresholdAt VS input,TJ= 25 C(2) CS (run)VS line-senserun currentCurrentout of VS pin increasing190225275 AIVSL(stop)VS line-sensestop current