TPS61500 3-A Boost Converter for High Brightness …

1 TPS61500 VINENPGNDAGNDDIMCFREQCOMPSSFBOVPPGNDPGND SWSWC5 PWMD1C1R1R2 Vin 5 VC3C2L1R4C4DL13W LEDDL2DL3DL4R3 ProductFolderOrderNowTechnicalDocumentsT ools &SoftwareSupport &CommunityAn IMPORTANTNOTICEat the end of this datasheetaddressesavailability,warranty, changes,use in safety-criticalapplications,intellectual propertymattersand DECEMBER2008 REVISEDMARCH2018 TPS615003-A BoostConverterfor high BrightnessLED DriverWith MultipleDimmingMethods11 Features1 18-VInputVoltageRange 3-A, 40-VInternalPowerSwitch Four3-W LEDsFrom5-V Input Eight3-W LEDsFrom12-VInput high -EfficiencyPowerConversion:Up to 93% FrequencySet by ExternalResistor:200 kHz MHz User-DefinedSoft StartInto Full Load ProgrammableOvervoltageProtection Analogand PurePWMB rightnessDimming 14-PinHTSSOPP ackageWithPowerPAD 2 Applications MonitorBacklight 1-W or 3-W high -BrightnessLED3 DescriptionTheTPS61500is a monolithicswitchingregulatorwith integrated3-A, is an idealdriverfor highbrightness1-Wor a wideinputvoltagerangeto supportapplicationwith inputvoltagefrommulti-cellbatteriesor regulated5-V or set withan externalsensorresistorR3,andthefeedbackv oltagethatisregulatedto 200 mV by currentmodePWM(pulsewidthmodulation)cont rolloop,as showninTypicalApplicationCircuit.

2 The devicesupportsanalogandpurePWMdimmingmet hodsfor capacitorto the DIMC pinconfiguresthe deviceto be usedfor analogdimming,and the LEDcurrentvariesproportionalto the dutycycleof an DIMCpin configuresthe devicefor purePWMdimmingwiththe averageLEDcurrentbeingthe PWMsignal's dutycycletimesa set programmablesoft-startfunctionto limit inrushcurrentduringstart-up,and ithas otherbuilt-inprotectionfeatures,suchas pulse-by-pulseovercurrentlimit,overvolta geprotection, TPS61500is availablein 14-pin HTSSOP packagewith (1)PARTNUMBERPACKAGEBODYSIZE(NOM)TPS6150 0 HTSSOP(14) (1) For all availablepackages,see the orderableaddendumatthe end of the DECEMBER2008 : TPS61500 SubmitDocumentationFeedbackCopyright 2008 2018,TexasInstrumentsIncorporatedTableof Contents1 Pin Configurationand Applicationand Deviceand Mechanical,Packaging,and RevisionHistoryNOTE:Pagenumbersfor previousrevisionsmay differfrompagenumbersin the (June2017)to RevisionEPage Changedgroundsymbolof R3 changefromPGNDto Changedgroundsymbolof R3 changefromPGNDto Changedgroundsymbolof R3 changefromPGNDto (March2015)to RevisionDPage Changed"Analogand PWMdimmingfrequency" to "PWMdimmingfrequency" in ROCtable;add separaterow for"Analogdimmingfrequency".

3 4 Addedsentenceat end (March2012)to RevisionCPage AddedPin Configurationand Functionssection,ESDR atingstable,FeatureDescriptionsection,De viceFunctionalModes,Applicationand Implementationsection,PowerSupplyRecomme ndationssection,Layoutsection,Deviceand DocumentationSupportsection,andMechanica l,Packaging,and (February2012)to RevisionBPage Changedthe ORDERINGINFORMATION tablePACKAGEMARKINGFrom: TPS61500 PWPTo: (December2008)to RevisionAPage Replacedthe DissipationRatingsTablewith the DECEMBER2008 REVISEDMARCH2018 ProductFolderLinks: TPS61500 SubmitDocumentationFeedbackCopyright 2008 2018,TexasInstrumentsIncorporated5 Pin Configurationand FunctionsPWPP ackage14-PinHTSSOPWithThermalPadTop ViewPin the ICCOMP8 OOutputof the externalRC networkis connectedto this PWMdimmingmethodoptionpin. A capacitorconnectedto the pin to set the time constantof referencefor pin for Whenthe voltageof this pin falls belowthe enablethresholdfor morethan10 ms, the ICturnsoff.

4 This pin is also usedfor PWMsignalinputfor for resistorconnectsto this pin to An externalresistoris connectedto this pin. SeeApplicationInformationfor informationon how to size the voltageis Usinga resistordividercan programthethresholdof the IC. It is connectedto the sourceof the startprogrammingpin. A capacitorbetweenthe SS pin and GNDpin programssoft Implementationfor informationon how to size the SS capacitorSW1, 2 IThis is the switchingnodeof the IC. ConnectSW to the switchedside of the The thermalpad shouldbe solderedto the possible,use thermalvia to connectto topand internalgroundplanelayersfor inputpin to the IC. ConnectVIN to a V and 18 V. It is acceptablefor thevoltageon the pin to be differentfromthe boostpowerstageinputfor DECEMBER2008 : TPS61500 SubmitDocumentationFeedbackCopyright 2008 2018,TexasInstrumentsIncorporated(1)Stre ssesbeyondthoselistedunderAbsoluteMaximu mRatingsmay causepermanentdamageto the stressratingsonly and functionaloperationof the deviceat theseor any otherconditionsbeyondthoseindicatedunder RecommendedOperatingConditionsis not absolute-maximum-ratedconditionsfor extendedperiodsmay affectdevicereliability.

5 (2)All voltagevaluesare with respectto (unlessotherwisenoted)(1)MINMAXUNITS upplyvoltageson pin VIN(2) pins EN(2) pin FB, FREQand COMP,OVP(2) pin DIMC,SS(2) pin SW(2) 40150 CStoragetemperature,Tstg 65150 C(1)JEDEC documentJEP155statesthat 500-VHBM allowssafe manufacturingwith a standardESDcontrolprocess.(2)JEDEC documentJEP157statesthat 250-VCDM allowssafe manufacturingwith a (ESD)ElectrostaticdischargeHumanbodymode l(HBM),per ANSI/ESDA/JEDECJS-001(1) 2000 VCharged-devicemodel(CDM),per JEDEC specificationJESD22-C101(2) 500(1)The inductancevaluedependson the switchingfrequencyand end be used, H and 47 H havebeensuccessfullytestedin Inductorfor details.(2)The Cdimwith the internalresistor(25 k TYP)formsa RC filter that generatesthe FB referencevoltageaccordingto the duty optimizethe RC filter and reducethe outputripple,the F of Cdimis recommended.(3)Whenanalogdimming,the max PWMfrequencyis set by on the RC filter to optimizethe ,the PWMfrequencyis set by the deviceloop (1) FCdimAnalogdimmingcapacitor(2) FPWMPWM dimmingfrequency(3)2001000 HzAnalogdimmingfrequency(3)20040 000 HzTAOperatingambienttemperature 4085 CTJO peratingjunctiontemperature 40125 DECEMBER2008 REVISEDMARCH2018 ProductFolderLinks.

6 TPS61500 SubmitDocumentationFeedbackCopyright 2008 2018,TexasInstrumentsIncorporated(1)For moreinformationabouttraditionaland new thermalmetrics,see theSemiconductorand IC (1) TPS61500 UNITPWP(HTSSOP)14 PINSR C/WR JC(top)Junction-to-case(top) C/WR C/W C/W C/WR JC(bot)Junction-to-case(bottom) MHz(Rfreq= 80 k ), Vin = V, CRTL= Vin, TA= 40 C to +85 C, typicalvaluesare at TA= 25 C (unlessotherwisenoted) VinDevicePWMswitchingwithoutload,VIN= = GND,Vin = logichigh voltageVin = V to 18 logiclow voltageVin = V to 18 pulldownresistor4008001600k ToffShutdowndelay,SS dischargeEN high to low10msVOLTAGEANDCURRENTCONTROLVREFV oltagefeedbackregulationvoltage195200205 mVIFBV oltagefeedbackinputbias current200nAVEA_OFFE rroramplifieroffset 10010mVIsinkCOMPpin sink currentVFB= VREF+200mV, VCOMP= 1 V40 AIsourceCOMPpin sourcecurrentVFB= VREF 200 mV, VCOMP= 1 V40 AVCCLPCOMPpin clampvoltageHighclamp3 VLow thresholdDutycycle= 0% mhoReaErroramplifieroutputresistance10M feaErroramplifiercrossoverfrequency500kH z6 TPS61500 SLVS893E DECEMBER2008.

7 TPS61500 SubmitDocumentationFeedbackCopyright 2008 2018,TexasInstrumentsIncorporatedElectri calCharacteristics(continued)FSW= MHz(Rfreq= 80 k ), Vin = V, CRTL= Vin, TA= 40 C to +85 C, typicalvaluesare at TA= 25 C (unlessotherwisenoted)PARAMETERTESTCONDI TIONSMINTYPMAXUNITFREQUENCYfSOscillatorf requencyRfreq= 480 k Rfreq= 80 k Rfreq= 40 k cycleRfreq= 80 k 89%93%VFREQFREQpin pulsewidthRfreq= 80 k 60nsRdim_filDimmingfilter resistance25k POWERSWITCHRDS(ON)N-channelMOSFETon-resi stanceVIN= VGS= VIN= VGS= 40 V, TA= 25 C1 AOC, OVPand SSILIMN-ChannelMOSFET currentlimitD = currentVss = 0 V6 CThysteresisThermalshutdownthresholdhyst eresis15 Cycle - %Overcurrent Limit - A190195200205210-40-20020406080100120T - Free-Air Temperature - CAFB Voltage - - Output Current - AO5060708090100 Efficiency - %4 LEDs8 LEDs10 LEDsV = 5 VI8 LEDs5060708090100 Efficiency - % - Output Current - AOV = 5 VIV = 12 DECEMBER2008 REVISEDMARCH2018 ProductFolderLinks: TPS61500 SubmitDocumentationFeedbackCopyright 2008 2018, Tableof GraphsFIGUREE fficiencyVIN = 5 V, 4 LEDs,8 LEDs,10 LEDsFigure1 EfficiencyVIN= 5 V, 12 V; VOUT= 8 LEDsFigure2FB voltageaccuracyvs TemperatureFigure3 Switchcurrentlimitvs DutycycleFigure4 Switchcurrentlimitvs TemperatureFigure5 CircuitofTypicalApplicationCircuit; L1 = D104C2-10 H.

8 D1 = SS3P6L-E3/86A,R4 = 80 k , C4 = 470 nF, C2 = 10 F, LED= OSRAMLCWW5SM,ILED= 400 mA; EfficiencyFigure2. EfficiencyFigure3. FB VoltageAccuracyFigure4. - Free-Air Temperature - CAOvercurrent Limit - A8 TPS61500 SLVS893E DECEMBER2008 : TPS61500 SubmitDocumentationFeedbackCopyright 2008 2018,TexasInstrumentsIncorporatedCircuit ofTypicalApplicationCircuit; L1 = D104C2-10 H; D1 = SS3P6L-E3/86A,R4 = 80 k , C4 = 470 nF, C2 = 10 F, LED= OSRAMLCWW5SM,ILED= 400 mA; SwitchCurrentLimitOVPSWRampGeneratorOsci llatorCurrentSensorENPGND+EAVINPWM V mV DECEMBER2008 REVISEDMARCH2018 ProductFolderLinks: TPS61500 SubmitDocumentationFeedbackCopyright 2008 2018,TexasInstrumentsIncorporated7 TPS61500integratesa 3-A, 40-Vlow side switchFETfor drivingup to 10 high -brightnessLEDsin deviceregulatesthe FB pin voltageat 200 mV with currentmodepulsewidthmodulation(PWM)cont rol,and the LEDcurrentis sensedthrougha low-valueresistorin serieswith PWMcontrolcircuitryturnson the switchat the beginningof inputvoltageisappliedacrossthe inductorand storesthe energyas inductorcurrentrampsup.

9 Duringthis portionof theswitchingcycle,the loadcurrentis providedby the inductorcurrentrisesto thethresholdset by the erroramplifieroutput,the powerswitchturnsoff and the externalSchottkydiodeis inductortransfersstoredenergyto replenishthe outputcapacitorand supplythe shownin the blockdiagram,the dutycycleof the converterisdeterminedby the PWMcontrolcomparatorwhichcomparesthe erroramplifieroutputand the switchingfrequencyis programmedby the rampsignalfromthe oscillatoris addedto the necessaryto avoidsub-harmonicoscillationthat is intrinsicto the currentmodecontrolat duty cyclehigherthan50%.The feedbackloopregulatesthe FB pin to a referencevoltagethroughan outputof the erroramplifierisconnectedto the COMPpin. An externalcompensationnetworkis connectedto the COMPpin to optimizethefeedbackloop for stabilityand - kWf - Frequency - kHz10 TPS61500 SLVS893E DECEMBER2008 : TPS61500 SubmitDocumentationFeedbackCopyright 2008 2018, switchfrequencyis determinedby a resistorconnectedto the FREQpin of the not leavethispin resistormustalwaysbe connectedfor Table2 and Figure6 for resistorvaluesand SwitchingFrequencyvs ExternalResistorR4 (k )fSW(kHz)443240256400176600801200512000 Figure6.

10 SwitchingFrequencyvs ExternalResistorIncreasingswitchingfrequ encyreducesthe valueof externalcapacitorsand inductors,but usershouldset the frequencyfor compromisebetweenefficiencyand TPS61500has a built-insoft startcircuitwhichsignificantlyreducesthe start-upcurrentspikeand deviceis enabled,an internalbias current(typically6 A) chargesa capacitor(C3)on the SS pin. The voltageat the capacitorclampsthe outputof the internalerroramplifierthat determinesthedutycycleof PWMcontrol,therebythe inputinrushcurrentis V, thesoft startcycleis completedand the soft startvoltageno longerclampsthe and Figure10 for the soft 47-nFcapacitoreliminatesthe outputovershootandreducesthe peakinductorcurrentfor EN is pulledlow for 10-ms,the IC entersshutdownand the SS capacitordischargesthrougha 5-k resistorfor the next soft ThermalShutdownThe TPS61500entersshutdownwhenthe EN voltageis less V for morethan10 ms. In shutdown,theinputsupplycurrentfor the deviceis less A (maximum).