LM5026 Active Clamp Current Mode PWM Controller datasheet ...

1 T1 CSVIN36 - I/OLM5026 UVLOPGNDAGNDCOMPOUT_AOUT_BVCCSSRTSYNCREF TIMERESCSVINDCLERRORAMP andISOLATIONP roductFolderSample &BuyTechnicalDocumentsTools &SoftwareSupport &CommunityReferenceDesignLM5026 SNVS363E AUGUST2005 REVISEDNOVEMBER2015LM5026 ActiveClampCurrentMode PWM Controller1 Features3 DescriptionTheLM5026 PWMcontrollercontainsall of the1 Current -ModeControlfeaturesnecessaryto implementpowerconverters Internal100-VStart-UpBiasRegulatorutiliz ingthe activeclampandresettechniquewith 3-A ,higherefficienciesandgreaterpower HighBandwidthOptocouplerInterfacedensiti escan be realizedcomparedto conventional ProgrammableLine UndervoltageLockout(UVLO)catchwindingor RDCclampand provided,the mainpower VersatileDualModeOvercurrentProtectionWi thswitchcontrol(OUT_A)and the activeclampswitchHiccupDelayTimercontrol (OUT_B).

2 Thedevicecan be configuredtocontroleithera P-Channelor N-Channelclamp ProgrammableOverlapor compoundMainand ActiveClampOutputsconfiguration,consisti ngof bothMOSandBipolar ProgrammableMaximumDutyCycleClampdevices ,providingsuperiorgatedrivecharacteristi cs. ProgrammableSoft-StartThe LM5026can be configuredto operatewith biasvoltagesovera wideinputrangeof 8 V to 100 V. LeadingEdgeBlankingAdditionalfeaturesinc ludeprogrammablemaximum ResistorProgrammed1-MHzCapableOscillator dutycycle,line undervoltagelockout,cycle-by-cycle OscillatorSyncI/O Capabilitycurrentlimit,hiccupmodefaultop erationwithadjustabletimeoutdelay,PWMslo pecompensation, Precision5-V Referencesoft-start,1-MHzcapableoscillat orwithsynchronizationinputand outputcapability,precision2 Applicationsreference,and thermalshutdown.

3 ServerPowerSupplies 48-VTelecomPowerSuppliesDeviceInformatio n(1)PARTNUMBERPACKAGEBODYSIZE(NOM) HighEfficiencyDC DC PowerSuppliesWSON(16) (16) (1) For all availablepackages,see the orderableaddendumatthe end of the IMPORTANTNOTICEat the end of this datasheetaddressesavailability,warranty, changes,use in safety-criticalapplications,intellectual propertymattersand AUGUST2005 Applicationand Pin Configurationand Deviceand Mechanical,Packaging,and RevisionHistoryNOTE:Pagenumbersfor previousrevisionsmay differfrompagenumbersin the (April2013)to RevisionEPage AddedESDR atingstable,FeatureDescriptionsection,De viceFunctionalModes,ApplicationandImplem entationsection,PowerSupplyRecommendatio nssection,Layoutsection,DeviceandDocumen tationSupportsection,andMechanical,Packa ging, (April2013)to RevisionDPage Changedlayoutof NationalDataSheetto TI 2005 2015, AUGUST2005 REVISEDNOVEMBER20155 Pin Configurationand FunctionsPW PackageNHQP ackage16-PinTSSOP16-PinWSONTop ViewTop ViewPin FunctionsPINTYPE(1) the 13 V to 100 V1 VINI with transientcapabilityto 105 V.

4 For powersourcesoutsideof this range,the LM5026canbe biaseddirectlyat VCCby an externalvoltagedividerfromthe powersourcesets theshutdownand VCC2 UVLOIand REFregulatorsare the SS pin is releasedand thedeviceentersthe currentmodecontroland CS V, the3 CSIoutputpulsewill be terminated, internalswitchholdsCS low for 100 nS afterOUT_Aswitcheshigh to cycle-by-cyclecurrentlimit is reachedduringany cycle,a 10- A currentissourcedto the RESpin the V, the soft-start4 RESI capacitorwill be fully dischargedand thenreleasedwith a pullupcurrentof 1 A. Afterthefirst outputpulseat OUT_A(whenSS = V), the SS pin chargingcurrentwill revertbackto 50 externalresistor(RSET)sets eitherthe overlaptime or deadtimefor the RSET resistorconnectedbetweenTIME5 TIMEIand AGND producesin-phaseOUT_Aand OUT_Bpulseswith RSET resistorconnectedbetweenTIMEand REFproducesout-of-phaseOUT_Aand 5-V 10 mA.

5 Locallydecouplewith a the high VCCvoltageis regulatedto V. If an7 VCCP auxiliarywindingraisesthe voltageon this pin abovethe regulationsetpoint,the internalstart-upregulatorwill shutdown,thus reducingthe IC the 3-A the sink externalcapacitorand an internal50- A currentsourceset the SS currentsourceis reducedto 1 A followinga soft-stopdischargecurrentis 50 the externaloptocouplerconnectedto the COMP pinsourcescurrentinto an PWMduty cycleis maximumwith13 COMPI zeroinputcurrent,while1 mA reducesthe duty cycleto currentmirrorimprovesthe frequencyresponseby reducingthe ac voltageacrossthe optocouplerdetector.

6 (1)P = Power,G = Ground,I = Input,O = Output,I/O = Input/OutputCopyright 2005 2015,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback3 ProductFolderLinks:LM5026LM5026 SNVS363E AUGUST2005 Functions(continued)PINTYPE(1) 2 V. The total externalresistanceconnected14 RTIbetweenRT and AGND sets the internaloscillatorcan be synchronizedto an15 SYNCI/Oexternalclockwith an besynchronizedtogetherby connectionof externalresistordividerconnectedfromRT to AGND sets16 DCLIthe maximumoutputduty cyclefor (WSONE xposedPad,undersideof systemgroundplanefor )6 (1)(2).MINMAXUNITVINto GND GND to GND otherinputsto GND CStoragetemperature,Tstg 65150 C(1)StressesbeyondthoselistedunderAbsolu teMaximumRatingsmay causepermanentdamageto the stressratingsonly,whichdo not implyfunctionaloperationof the deviceat theseor any otherconditionsbeyondthoseindicatedunder RecommendedOperatingConditions.

7 Exposureto absolute-maximum-ratedconditionsfor extendedperiodsmay affectdevicereliability.(2)If Military/Aerospacespecifieddevicesare required,pleasecontactthe TI SalesOffice/Distributorsfor availabilityand (HBM),per ANSI/ESDA/JEDECJS-001(1)(2) 2000V(ESD)ElectrostaticdischargeVCharged -devicemodel(CDM),per JEDEC specificationJESD22-C101(3) 500(1)JEDEC documentJEP155statesthat 500-VHBM allowssafe manufacturingwith a than500-VHBMis possiblewith the 2000V may actuallyhavehigherperformance.(2)The humanbodymodelis a 100-pFcapacitordischargedthrougha resistorinto eachpin.(3)JEDEC documentJEP157statesthat 250-VCDM allowssafe manufacturingwith a (unlessotherwisenoted)(1)MINMAXUNITVIN voltage13100 VExternalvoltageappliedto VCC815 VOperatingjunctiontemperature 40125 C(1)AbsoluteMaximumRatingsare limitsbeyondwhichdamageto the devicemay conditionsunderwhichoperationof the deviceis intendedto be specificationsand test conditions,see 2005 2015, AUGUST2005 (1)NHQ(WSON)PW (TSSOP)UNIT16 PINS16 PINSR C/WR JC(top)Junction-to-case(top) C/WR C/W C/W C/WR JC(bot)Junction-to-case(bottom) C/W(1)

8 For moreinformationabouttraditionaland new thermalmetrics,see theSemiconductorandICPackageThermalMetri csapplicationreport, for TJ= 25 C 48 V, VCC= 10 V, RT = , Rset= maximumspecificationsapplyoverfull operatingjunctiontemperaturerange.(1)PAR AMETERTESTCONDITIONSMINTYPMAXUNITSTART-U PREGULATORTJ= 25 LoadVoverfull 25 C25 VCCcurrentlimitSee(2)mAoverfull operatingjunction20temperaturerangeTJ= 25 C165 Start-upregulatorI-VINleakage(externalVC CVIN= 100 V Aoverfull operatingjunction500supply)temperaturera ngeTJ= 25 C350 Shutdowncurrent(Iin)UVLO= 0 V Aoverfull operatingjunction450temperaturerangeVCCS UPPLYVCCReg TJ= 25 CVCC undervoltage120 mVlockoutvoltageVVCCReg 220(positivegoingVcc)overfull operatingjunctiontemperaturerangemVTJ= 25 operatingjunctiontemperaturerange12 VCCsupplycurrentCgate= 0, UVLO= V, overfull (ICC)

9 TemperaturerangeREFERENCESUPPLYTJ= 25 C5 Ref voltageIREF= 0 mAVoverfull 25 C25 VREFRef voltageregulationIREF= 0 to 10 mAmVoverfull operatingjunction50temperaturerangeTJ= 25 C20 Ref currentlimitmAoverfull operatingjunctiontemperaturerange10 UVLOSHUTDOWN/STANDBYTJ= 25 (1)Minimumand maximumlimitsare 100%productiontestedat 25 C. Limitsoverthe operatingtemperaturerangeare specifiedthroughcorrelationusingStatisti calQualityControl(SQC) usedto calculateAverageOutgoingQualityLevel(AOQ L).Allelectricalcharacteristicshavingroo mtemperaturelimitsare testedduringproductionwith TA= TJ= 25 C. All hot and cold limitsarespecifiedby correlatingthe electricalcharacteristicsto processand temperaturevariationsand applyingstatisticalprocesscontrol.

10 (2)Devicethermallimitationsmay limit 2005 2015,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback5 ProductFolderLinks:LM5026LM5026 SNVS363E AUGUST2005 (continued)Specificationtypicalvaluesare for TJ= 25 C 48 V, VCC= 10 V, RT = , Rset= maximumspecificationsapplyoverfull operatingjunctiontemperaturerange.(1) 25 25 C20hysteresiscurrent Aoverfull operatingjunctiontemperaturerange1624sou rceCURRENTLIMITTJ= 25 step from0 to V Timeto onsetof OUTtransitionILIM delay-to-output40ns(90%)Cgate=0TJ= 25 C100 Leadingedgensblankingtimeoverfull operatingjunctiontemperaturerange70130TJ = 25 C30CS sink impedanceICS= 10 mA overfull operatingjunction(clocked)