LM2460

LM2460 TI1 | Alldatasheet

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www.ti.com SNOSA92B –JUNE 2002–REVISED APRIL 2013 LM2460MonolithicTripleChannelHighSwingCRTDriver Check forSamples: LM2460 1FEATURES DESCRIPTION The LM2460 isan integratedhighvoltageCRT driver 2• 0V to5V InputRange circuitdesigned foruse in high brightnessmonitor• Capable ofUp To a 70 Vp-p Output Swing applications.The IC contains three high input

• StableWith 0–20 pF CapacitiveLoads and impedance,wide band amplifierswhich directlydrive InductivePeaking Networks the RGB cathodesof a CRT. Each channelhas its gain internallyset to −30 and can drive CRT• Convenient TO-220 Staggered Lead Package capacitiveloadsas wellas resistiveloadspresentinStyle otherapplication,limitedonlyby thepackage’s power• Matched toLM126X/3X/4X Pre-Amplifier dissipation. Families The IC ispackaged in an industrystandard9 lead TO-220 molded plasticpackage.APPLICATIONS
• High BrightnessCRT Monitors SCHEMATIC AND CONNECTION DIAGRAMS Figure1.SimplifiedSchematic Diagram Figure2.See Package Number TO-220 (Top View) (One Channel) Pleasebe aware thatan importantnoticeconcerningavailability,standardwarranty,and use incriticalapplicationsof Texas Instrumentssemiconductorproductsand disclaimerstheretoappearsattheend ofthisdatasheet. 2Alltrademarksarethepropertyoftheirrespectiveowners. PRODUCTION DATA informationiscurrentas ofpublicationdate. Copyright© 2002–2013,Texas InstrumentsIncorporatedProductsconform to specificationsper the terms of the Texas Instrumentsstandardwarranty.Productionprocessingdoes not necessarilyincludetestingofallparameters.

SNOSA92B –JUNE 2002–REVISED APRIL 2013 www.ti.com These deviceshave limitedbuilt-inESD protection.The leadsshouldbe shortedtogetherorthedeviceplacedinconductivefoam duringstorageorhandlingtopreventelectrostaticdamage totheMOS gates. ABSOLUTE MAXIMUM RATINGS (1)(2)(3) SupplyVoltage(VCC ) +136V BiasVoltage(VBB ) +16V InputVoltage(VIN) −0.5> VIN > 4.25V StorageTemperature −40°C to+150°C Lead Temperature(Soldering,<10 sec.) 265°C ESD Tolerance Human Body Model 2 kV Machine Model 200V JunctionTemperature(TJ) 150°C (1) AbsoluteMaximum Ratingsindicatelimitsbeyond whichdamage tothedevicemay occur. (2) Allvoltagesaremeasured withrespecttoGND, unlessotherwisespecified. (3) IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheTexas InstrumentsSalesOffice/Distributorsforavailabilityand specifications. OPERATING RATINGS (1) VCC +80V to+125V VBB +6V to+10V VIN +1V to+5V VOUT +25V to+115V Case Temperature 100°C Do notoperatethepartwithouta heatsink (1) OperatingRatingsindicateconditionsforwhichthedeviceisfunctional,butdo notensurespecificperformancelimits.Forensured specificationsand testconditions,see theELECTRICAL CHARACTERISTICS .Datasheetmin/max specificationlimitsarespecifiedby design,test,orstatisticalanalysis.The ensuredspecificationsapplyonlyforthetestconditionslisted.Some performancecharacteristics may change when thedeviceisnotoperatedunderthelistedtestconditions.

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ELECTRICAL CHARACTERISTICS

(See Figure3 forTestCircuit) Unlessotherwisenoted:VCC = +120V, VBB = +8V, C L = 8 pF,TC = 50°C DC Tests:VIN = +2.2VDC AC Tests:Output= 60 VP-P (45V − 105V) at1 MHz LM2460 Symbol Parameter Conditions Units Min Typ Max ICC SupplyCurrent AllThreeChannels,No Video 35 45 mAInput,No OutputLoad IBB BiasCurrent AllThreeChannels 15 25 mA VOUT, 1 DC OutputVoltage No AC InputSignal,VIN = 2.2VDC 73 78 83 VDC VOUT, 2 DC OutputVoltage No AC InputSignal,VIN = 1.2VDC 104 109 114 VDC AV DC VoltageGain No AC InputSignal −28 −32 −34 V/V ΔAV Gain Matching See (1),No AC InputSignal 1.0 dB LE LinearityError See (1)(2),No AC InputSignal 10 % tr(60VP-P) RiseTime,45V to105V See (3),10% to90% 8.0 ns tf(60VP-P) FallTime,45V to105V See (3),90% to10% 11.5 ns tr(40VP-P) RiseTime,65V to105V See (3),10% to90% 7.7 ns tf(40VP-P) FallTime,65V to105V See (3),90% to10% 9.5 ns OS Overshoot See (3) 5 % (1) CalculatedvaluefromVoltageGain teston each channel. (2) LinearityErroristhevariationindc gainfromVIN = 1.1VtoVIN = 3.8V. (3) Inputfromsignalgenerator:tr,tf< 1 ns. AC TEST CIRCUIT Figure3. TestCircuit(One Channel) Figure3 shows a typicaltestcircuitforevaluationoftheLM2460. Thiscircuitisdesignedtoallowtestingofthe LM2460 ina 50Ω environmentwithoutthe use of an expensiveFET probe.The two 4990Ω resistorsform a 200:1dividerwiththe50Ω resistorand theoscilloscope.A testpointisincludedforeasy use ofan oscilloscope probe.The compensationcapacitorisused tocompensate thestraycapacitanceofthetwo 4990Ω resistorsto achieveflatfrequencyresponse. Copyright© 2002–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 3 ProductFolderLinks:LM2460

SNOSA92B –JUNE 2002–REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (VCC = +120 VDC ,VBB = +8 VDC ,C L = 8 pF,VOUT = 60 VPP (45−105V),TestCircuit— Figure3 unlessotherwisespecified. Figure4.VIN vs VOUT Figure5.Speed vs Case Temperature Figure6.LM2460 Pulse Response Figure7.Power Dissipationvs Frequency Figure8.Speed vs OffsetVoltage Figure9.Speed vs Load Capacitance

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www.ti.com SNOSA92B –JUNE 2002–REVISED APRIL 2013 THEORY OF OPERATION The LM2460 isa highvoltagemonolithicthreechannelCRT driverwitha higheroutputswingsuitablefordriving thenew highbrightnessCRTs. The LM2460 operateswith120V and 8V power supplies.The partishoused in theindustrystandard9-leadTO-220 molded plasticpower package. The circuitdiagramoftheLM2460 isshown inFigure1.The PNP emitterfollower,Q5, providesinputbuffering. Q1 and Q2 forma fixedgaincascodeamplifierwithresistorsR1 and R2 settingthegainat−32.Emitterfollowers Q3 and Q4 isolatethe highoutputimpedance of the amplifierfrom the capacitiveloadon the outputof the amplifier,decreasingthe sensitivityof the deviceto changes inloadcapacitance.Q6 providesbiasingto the outputemitterfollowerstagetoreducecrossoverdistortionatlowsignallevels. Figure3 shows a typicaltestcircuitforevaluationoftheLM2460. Thiscircuitisdesignedtoallowtestingofthe LM2460 ina 50Ω environmentwithouttheuse ofan expensiveFET probe.Inthistestcircuit,two low inductance resistorsinseriestotaling4.95 kΩ form a 200:1 wideband,low capacitanceprobe when connectedto a 50Ω coaxialcableand a 50Ω load(suchas a 50Ω oscilloscopeinput).The inputsignalfrom the generatorisAC coupledtothebase ofQ5. VBIAS isused toadjusttheDC leveloftheoutput. APPLICATION HINTS INTRODUCTION Texas Instrumentsiscommittedto provideapplicationinformationthatassistsour customersinobtainingthe best performancepossiblefrom our products.The followinginformationisprovidedin orderto supportthis commitment.The readershouldbe aware thattheoptimizationofperformancewas done usinga specificprinted circuitboard designedatTI.Variationsinperformancecan be realizeddue tophysicalchanges intheprinted circuitboard and theapplication.Therefore,thedesignershouldknow thatcomponent valuechanges may be requiredinordertooptimizeperformanceina givenapplication.The valuesshown inthisdocument can be used as a startingpointforevaluationpurposes.When workingwithhighbandwidthcircuits,good layoutpracticesare alsocriticaltoachievingmaximum performance. IMPORTANT INFORMATION The LM2460 performanceistargetedforthe15″ and 17″ marketwithresolutionsup to1024 x 7684 and 75 Hz refreshrate.Itisdesignedtobe a replacementfordiscreteCRT drivers.The applicationcircuitsshown inthis document tooptimizeperformanceand toprotectagainstdamage from CRT arc-overare designedspecifically fortheLM2460. Ifanothermember oftheLM246X familyisused,pleaserefertoitsdatasheet. POWER SUPPLY BYPASS Since the LM2460 is a wide bandwidth amplifier,proper power supply bypassingis criticalforoptimum performance.Improperpower supplybypassingcan resultinlargeovershoot,ringingor oscillation.A 0.1 µF capacitorshouldbe connectedfromthesupplypin,VCC ,toground,as closetothesupplyand groundpinsas is practical.Additionally,a 22 µF to 100 µF electrolyticcapacitorshouldbe connectedfrom the supplypin to ground.The electrolyticcapacitorshouldalsobe placedreasonablyclosetotheLM2460 ’s supplyand ground pins.A 0.1µF capacitorshouldbe connectedfrom thebiaspin(VBB ) toground,as closeas ispracticaltothe part. Copyright© 2002–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 5 ProductFolderLinks:LM2460

SNOSA92B –JUNE 2002–REVISED APRIL 2013 www.ti.com ARC PROTECTION During normal CRT operation,internalarcingmay occasionallyoccur.Spark gaps, in the range of 200V, connectedfrom theCRT cathodestoCRT ground willlimitthemaximum voltage,buttoa valuethatismuch higherthanallowableon theLM2460. Thisfast,highvoltage,highenergypulsecan damage theLM2460 output stage.The applicationcircuitshown inFigure10 isdesignedto helpclamp the voltageat the outputof the LM2460 toa safelevel.The clamp diodes,D1 and D2, shouldhave a fasttransientresponse,highpeak current rating,low seriesimpedance and low shuntcapacitance.FDH400 or equivalentdiodesare recommended. Do notuse 1N4148 diodesfortheclamp diodes.D1 and D2 shouldhave short,low impedance connectionstoVCC and ground respectively.The cathodeof D1 shouldbe locatedverycloseto a separatelydecoupledbypass capacitor(C3 inFigure10).The groundconnectionofD2 and thedecouplingcapacitorshouldbe verycloseto theLM2460 ground.ThiswillsignificantlyreducethehighfrequencyvoltagetransientsthattheLM2460 wouldbe subjectedtoduringan arcovercondition.ResistorR2 limitsthearcovercurrentthatisseen by thediodeswhile R1 limitsthecurrentintotheLM2460 as wellas thevoltagestressattheoutputsofthedevice.R2 shouldbe a 1/2W solidcarbontyperesistor.R1 can be a 1/4W metalorcarbonfilmtyperesistor.Havinglargevalueresistors forR1 and R2 would be desirable,butthishas theeffectofincreasingriseand falltimes.InductorL1 iscriticalto reducetheinitialhighfrequencyvoltagelevelsthattheLM2460 would be subjectedto.The inductorwillnotonly helpprotectthedevicebutitwillalsohelpoptimizeriseand falltimesas wellas minimizeEMI. For properarc protection,itisimportanttonotomitany ofthearcprotectioncomponents shown inFigure10. Figure10. One Channel oftheLM2460 withtheRecommended ApplicationCircuit OPTIMIZING TRANSIENT RESPONSE Referringto Figure10, thereare threecomponents,(R1, R2 and L1) thatcan be adjustedto optimizethe transientresponseoftheapplicationcircuit.IncreasingthevaluesofR1 and R2 willslowthecircuitdown while decreasingovershoot.IncreasingthevalueofL1 willspeed up thecircuitas wellas increaseovershoot.Itisvery importantto use inductorswithvery high self-resonantfrequencies,perferablyabove 300 MHz. Ferritecore inductorsfromJ.W.MillerMagnetics(part# 78FR--K)were used foroptimizingtheperformanceofthedevicein theTIapplicationboard.The valuesshown inFigure10 can be used as a good startingpointfortheevaluation oftheLM2460. Usinga variableresistorforR1 willsimplifyfindingthevalueneeded foroptimum performancein a givenapplication.Once the optimum valueisdeterminedthe variableresistorcan be replacedwitha fixed value. EffectofLoad Capacitance Figure9 shows the effectof increasedloadcapacitanceon the speed of the device.Thisdemonstratesthe importanceof knowing the load capacitancein the application.The risetime increasedabout 0.8 ns foran increaseof1 pF intheloadcapacitance.The falltimedoes remainalmostthesame as theloadcapacitanceis increased. EffectofOffset Figure8 shows thevariationinriseand falltimeswhen theoutputoffsetofthedeviceisvariedfrom 70 to80 VDC .The risetimehas verylittleincreaseoveritsfastestpointnear75V. The falltimebecomes a littlefasteras theoffsetvoltageincreases.

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www.ti.com SNOSA92B –JUNE 2002–REVISED APRIL 2013 THERMAL CONSIDERATIONS Figure5 shows the performanceof the LM2460 in the testcircuitshown in Figure3 as a functionof case temperature.The figureshows thatthe risetimeof the LM2460 increasesby approximately13% as the case temperatureincreasesfrom30°C to100°C. Thiscorrespondstoa speed degradationof2.0% forevery10°C rise incase oftemperature.The falltimehas almostno change as thecase temperatureincreases. Figure7 shows the maximum power dissipationof the LM2460 vs Frequency when allthreechannelsof the devicearedrivingan 8 pF loadwitha 60 Vp-p alternatingone pixelon,one pixeloff.The graphassumes a 72% activetime(deviceoperatingatthespecifiedfrequency)whichistypicalina monitorapplication.The other28% of the time the deviceisassumed to be sittingat the blacklevel(105V in thiscase).This graph givesthe designertheinformationneeded todeterminetheheatsinkrequirementforhisapplication.The designershould note thatifthe load capacitanceisincreasedthe AC component of the totalpower dissipationwould also increase. The LM2460 case temperaturemust be maintainedbelow 100°C. Ifthemaximum expectedambienttemperature is70°C and themaximum power dissipationis11W (fromFigure7,70 MHz bandwidth)thena maximum heat sinkthermalresistancecan be calculated: (1) Thisexample assumes a capacitiveloadof8 pF and no resistiveload. TYPICAL APPLICATION A typicalapplicationoftheLM2460 isshown inFigure11 and Figure12.Used inconjunctionwitha LM1267 pre- amp and a LM2479 biasclamp,a completevideochannelfrommonitorinputtoCRT cathodecan be achieved. Performanceisidealfor1024 x 768 resolutiondisplayswithpixelclockfrequenciesup to80 MHz. Figure11 and Figure12 aretheschematicfortheTIdemonstrationboardthatcan be used toevaluatetheLM1267/2460/2479 combinationina monitor. PC BOARD LAYOUT CONSIDERATIONS For optimum performance,an adequateground plane,isolationbetween channels,good supplybypassingand minimizingunwanted feedbackare necessary.Also,thelengthofthesignaltracesfrom thepreamplifiertothe LM2460 and fromtheLM2460 totheCRT cathodeshouldbe as shortas possible.The followingreferencesare recommended: Ott,Henry W.,“NoiseReductionTechniquesinElectronicSystems”,John Wiley& Sons,New York,1976. “VideoAmplifierDesignforComputer Monitors”,Texas InstrumentsApplicationNote 1013. Pease,RobertA.,“TroubleshootingAnalogCircuits”,Butterworth-Heinemann,1991. Because of itshighsmallsignalbandwidth,the partmay oscillateina monitoriffeedbackoccursaround the videochannelthroughthe chassiswiring.To preventthis,leadsto the videoamplifierinputcircuitshouldbe shielded,and inputcircuitwiringshouldbe spaced as faras possiblefromoutputcircuitwiring. TIDEMONSTRATION BOARD Figure13 shows the routingand component placement on the TI LM126X/246X/LM2479/80 demonstration board.The schematicoftheboardisshown inFigure11 and Figure12.Thisboardprovidesa good example of a layoutthatcan be used as a guideforfuturelayouts.Note thelocationofthefollowingcomponents:

• C16, C19 — VCC bypasscapacitor,locatedveryclosetopin4 and groundpins
• C17, C20 — VBB bypasscapacitors,locatedclosetopin8 and ground
• C46, C47, C48 — VCC bypass capacitors,near LM2460 and VCC clamp diodes.Very importantforarc protection. The routingof the LM2460 outputsto the CRT isverycriticalto achievingoptimum performance.Figure14 shows theroutingand component placementfrompin3 oftheLM2460 tothebluecathode.The bluevideopath fromtheLM2460 outputisshown by thedarkertraces.Note thatthecomponents areplacedso thattheyalmost lineup fromtheoutputpinoftheLM2460 tothebluecathodepinoftheCRT connector.Thisisdone tominimize thelengthofthevideopathbetween thesetwo components.Note alsothatD8, D9, R24 and D6 are placedto minimizethesizeofthevideonodes thattheyareattachedto.Thisminimizesparasiticcapacitanceinthevideo Copyright© 2002–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 7 ProductFolderLinks:LM2460

SNOSA92B –JUNE 2002–REVISED APRIL 2013 www.ti.com path and also enhances the effectivenessof the protectiondiodes.The anode of protectiondiode D8 is connecteddirectlytoa sectionofthegroundplanethathas a shortand directpathtotheLM2460 groundpins. The cathode of D9 is connected to VCC very closeto decouplingcapacitorC48 (see Figure14) which is connectedtothesame sectionofthegroundplaneas D8. The diodeplacementand routingisveryimportantfor minimizingthevoltagestresson theLM2460 duringan arcoverevent.Lastly,noticethatS3 isplacedveryclose tothebluecathodeand istieddirectlytoCRT ground.

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www.ti.com SNOSA92B –JUNE 2002–REVISED APRIL 2013 Figure11. LM1267/2460 DemonstrationBoard Schematic Copyright© 2002–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 9 ProductFolderLinks:LM2460

SNOSA92B –JUNE 2002–REVISED APRIL 2013 www.ti.com Figure12. LM1267/2460 DemonstrationBoard Schematic (continued)

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www.ti.com SNOSA92B –JUNE 2002–REVISED APRIL 2013 Figure13. LM126X/246X Demo Board Layout Figure14. Trace Routing and Component Placement forBlue Channel Output Copyright© 2002–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 11 ProductFolderLinks:LM2460

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REVISION HISTORY

Changes from RevisionA (April2013)toRevisionB Page

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