LM2429

LM2429 TI1 | Alldatasheet

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www.ti.com SNOSA76D –JULY 2003–REVISED APRIL 2013 LM2429MonolithicTripleChannel15MHzDTVDriver Check forSamples: LM2429 1FEATURES DESCRIPTION The LM2429 isan integratedhighvoltageCRT driver 2• 0V to5V InputRange circuitdesignedforuse inDTV applications.The IC• Greaterthan 130VPP Output Swing Capability containsthree high inputimpedance, wide band

• StableWith 0–20 pF CapacitiveLoads and amplifierswhichdirectlydrivetheRGB cathodesofa InductivePeaking Networks CRT. Each channelhas itsgaininternallysetto−51 and can driveCRT capacitiveloads as well as• Convenient TO-220 Staggered Thin Lead resistiveloadspresentin otherapplications,limitedPackage Style onlyby thepackage'spower dissipation. APPLICATIONS The IC ispackaged inan industrystandard11-lead TO-220 molded plasticpower package designed• AC Coupled DTV ApplicationsUsing the480p specificallyto meet high voltage spacingFormat as wellas Standard NTSC and PAL requirements.See THERMAL CONSIDERATIONSFormats section. SCHEMATIC DIAGRAMCONNECTION DIAGRAM Note:Tab isatGND Figure1. SimplifiedConnection and Pinout Diagram (Top View) Figure2. SimplifiedSchematic Diagram (One Channel) Pleasebe aware thatan importantnoticeconcerningavailability,standardwarranty,and use incriticalapplicationsof Texas Instrumentssemiconductorproductsand disclaimerstheretoappearsattheend ofthisdatasheet. 2Alltrademarksarethepropertyoftheirrespectiveowners. PRODUCTION DATA informationiscurrentas ofpublicationdate. Copyright© 2003–2013,Texas InstrumentsIncorporatedProductsconform to specificationsper the terms of the Texas Instrumentsstandardwarranty.Productionprocessingdoes not necessarilyincludetestingofallparameters.

SNOSA76D –JULY 2003–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 ) +200V BiasVoltage(VBB ) +15V InputVoltage(VIN) -0.5VtoVBB +0.5V StorageTemperatureRange (TSTG ) −65°C to+150°C Lead Temperature(Soldering,<10 sec.) 300°C ESD Tolerance, Human Body Model 2kV Machine Model 200V JunctionTemperature 150°C θJC (typ) 2.9°C/W (1) AbsoluteMaximum Ratingsindicatelimitsbeyond whichdamage tothedevicemay occur. (2) Allvoltagesaremeasured withrespecttoGND, unlessotherwisespecified. (3) IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheTexas InstrumentsSalesOffice/Distributorsforavailabilityand specifications. OPERATING RATINGS (1) VCC +130V to+180V VBB +7V to+13V VIN +0V to+4V VOUT +15V to+175V Case Temperature RefertoFigure11 Do notoperatethepartwithouta heatsink. (1) Operatingratingsindicateconditionsforwhichthedeviceisfunctional,butdo notensurespecificperformancelimits.Forensured specificationsand testconditions,see ElectricalCharacteristics.Datasheetmin/max specificationlimitsarespecifiedby design,test,or statisticalanalysis.The ensuredspecificationsapplyonlyforthetestconditionslisted.Some performancecharacteristicsmay change when thedeviceisnotoperatedunderthelistedtestconditions.

ELECTRICAL CHARACTERISTICS

(See Figure3 forTestCircuit) Unlessotherwisenoted:VCC = +180V, VBB = +8V, C L = 8pF,TC = 50°C. DC Tests:VIN = 2.5VDC . AC Tests:Output= 130VPP (35V -165V) at1MHz. LM2429 Symbol Parameter Conditions Units Min Typical Max ICC SupplyCurrent AllThreeChannels,No InputSignal,No 16 30 mAOutputLoad IBB BiasCurrent AllThreeChannels 12 17 mA VOUT, 1 DC OutputVoltage No AC InputSignal,VIN = 2.5VDC 100 105 110 VDC VOUT, 2 DC OutputVoltage No AC InputSignal,VIN = 1.2VDC 163 168 173 VDC AV DC VoltageGain No AC InputSignal -48 -51 -54 ΔAV Gain Matching See (1),No AC InputSignal 1.0 dB LE LinearityError See (1)(2),No AC InputSignal 8 % tR RiseTime See (3),10% to90% 26 ns tF FallTime See (3),90% to10% 30 ns OS Overshoot See (3) 5 % (1) CalculatedvaluefromVoltageGain teston each channel. (2) LinearityErroristhevariationinDC gainfromVIN = 1.1VtoVIN = 3.8V. (3) Inputfromsignalgenerator:tr,tf< 1 ns.

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www.ti.com SNOSA76D –JULY 2003–REVISED APRIL 2013 AC TEST CIRCUIT Note:8pF loadincludesparasiticcapacitance. Figure3. TestCircuit(One Channel) Figure3 shows a typicaltestcircuitforevaluationoftheLM2429. Thiscircuitisdesignedtoallowtestingofthe LM2429 ina 50Ω environmentwithoutthe use of an expensiveFET probe.The two 4990Ω resistorsform a 400:1dividerwiththe50Ω resistorand theoscilloscope.A testpointisincludedforeasy use ofan oscilloscope probe.Thecompensationcapacitorisused tocompensate thenetworktoachieveflatfrequencyresponse. Copyright© 2003–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 3 ProductFolderLinks:LM2429

SPEED (ns) OFFSET VOLTAGE (V) tf tr 30 40 50 60 70 80 90 100 110 CASE TEMPERATURE (°C) SPEED (ns) tf tr FREQUENCY (MHz) 1 10 100 MAGNITUDE (dB) -15 -12 8 10 12 14 16 18 20 LOAD CAPACITANCE (pF) SPEED (ns) tf tr 20V/DIV 200ns/DIV tr = 26ns tf = 30ns OBSOLETE LM2429 SNOSA76D –JULY 2003–REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (VCC = +180VDC ,VBB = +8VDC ,C L = 8pF,VOUT = 130VPP (35V − 165V),TestCircuit-Figure3 unlessotherwisespecified) Figure4.VOUT vs VIN Figure5.LM2429 Pulse Response Figure6. Bandwidth Figure7.Speed vs Load Capacitance Figure8.Speed vs Offset Figure9.Speed vs Case Temperature

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POWER DISSIPATION (W) FREQUENCY (MHz) 72% ACTIVE TIME OBSOLETE LM2429 www.ti.com SNOSA76D –JULY 2003–REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) (VCC = +180VDC ,VBB = +8VDC ,C L = 8pF,VOUT = 130VPP (35V − 165V),TestCircuit-Figure3 unlessotherwisespecified) Figure10.Power Dissipationvs Frequency Figure11.Power DeratingCurve Figure12. Cathode Pulse Response Table1.Power DissipationforVariousVideo Patterns(1) Power Dissipation(W) Format Pattern 480i 480p Raster 1.8 1.8 FullWhiteField 4.0 4.0 WhiteBox,75% ScreenSize 3.1 3.1 Gray Bars 3.2 3.3 ColorBars75% Amplitude 2.7 2.8 ColorBars100% Amplitude 3.0 3.0 SMPTE ColorBars 2.7 2.7 SMPTE 133 3.6 3.9 CrossHatch16x12 2.3 2.6 ResolutionChart 3.8 4.1 Multiburst 5.2 7.3 WhiteTexton BlackBackground 6.1 8.9 Windows Pattern 3.4 4.3 Windows Pattern 3.7 4.4 (1) Inputfromsignalgenerator:tr,tf< 2 ns. Copyright© 2003–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 5 ProductFolderLinks:LM2429

SNOSA76D –JULY 2003–REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Table1.Power DissipationforVariousVideo Patterns(1)(continued) Power Dissipation(W) Format Pattern 480i 480p Windows Pattern 5.0 6.2 VerticalLines5 On 5 Off 4.6 6.3 VerticalLines4 On 4 Off 5.0 7.1 VerticalLines3 On 3 Off 5.6 8.7 VerticalLines2 On 2 Off 7.2 11.4 VerticalLines1 On 1 Off 11.5 15.4

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www.ti.com SNOSA76D –JULY 2003–REVISED APRIL 2013 THEORY OF OPERATION The LM2429 isa highvoltagemonolithicthreechannelCRT driversuitableforHDTV applications.The LM2429 operateswith180V and 8V power supplies.The partishoused intheindustrystandard11-leadTO-220 molded plasticpower package withthinleadsforimprovedmetal-to-metalspacing. The circuitdiagramoftheLM2429 isshown inFigure2.The PNP emitterfollower,Q5, providesinputbuffering. Q1 and Q2 forma fixedgaincascodeamplifierwithresistorsR1 and R2 settingthegainat−51.Emitterfollowers Q3 and Q4 isolatethehighoutputimpedance ofthecascode stagefrom thecapacitanceoftheCRT cathode which decreasesthe sensitivityof the deviceto load capacitance.Q6 providesbiasingto the outputemitter followerstagetoreducecrossoverdistortionatlowsignallevels. Figure3 shows a typicaltestcircuitforevaluationoftheLM2429. Thiscircuitisdesignedtoallowtestingofthe LM2429 ina 50Ω environmentwithouttheuse ofan expensiveFET probe.Inthistestcircuit,thetwo 4.99kΩ resistorsforma 400:1wideband,low capacitanceprobewhen connectedtoa 50Ω coaxialcableand a 50Ω load (suchas a 50Ω oscilloscopeinput).The inputsignalfromthegeneratorisac coupledtothebase ofQ5. 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 LM2429 performanceistargetedfortheHDTV market.The applicationcircuitsshown inthisdocument to optimizeperformanceand to protectagainstdamage from CRT arcoverare designed specificallyforthe LM2429. Ifanothermember oftheLM242X familyisused,pleaserefertoitsdatasheet. POWER SUPPLY BYPASS Since the LM2429 is a wide bandwidth amplifier,proper power supply bypassingis criticalforoptimum performance.Improperpower supplybypassingcan resultin largeovershoot,ringingor oscillation.0.1µF capacitorsshouldbe connectedfrom the supplypins,VCC and VBB , to ground,as closeto the LM2429 as is practical.Additionally,a 22µF or largerelectrolyticcapacitorshouldbe connectedfrom both supplypinsto groundreasonablyclosetotheLM2429. Copyright© 2003–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 7 ProductFolderLinks:LM2429

SNOSA76D –JULY 2003–REVISED APRIL 2013 www.ti.com ARC PROTECTION During normal CRT operation,internalarcingmay occasionallyoccur.Spark gaps, in the range of 300V, connectedfrom theCRT cathodestoCRT ground willlimitthemaximum voltage,buttoa valuethatismuch higherthanallowableon theLM2429. Thisfast,highvoltage,highenergypulsecan damage theLM2429 output stage.The applicationcircuitshown inFigure13 isdesignedto helpclamp the voltageat the outputof the LM2429 toa safelevel.The clamp diodes,D1 and D2, shouldhave a fasttransientresponse,highpeak current rating,low seriesimpedance and low shuntcapacitance.1SS83 orequivalentdiodesarerecommended. D1 and D2 shouldhave short,low impedance connectionstoVCC and groundrespectively.The cathodeofD1 shouldbe locatedveryclosetoa separatelydecoupledbypass capacitor(C3 inFigure13).The ground connectionofD2 and thedecouplingcapacitorshouldbe veryclosetotheLM2429 ground.Thiswillsignificantlyreducethehigh frequencyvoltagetransientsthatthe LM2429 would be subjectedto duringan arcovercondition.ResistorR2 limitsthearcovercurrentthatisseen by thediodeswhileR1 limitsthecurrentintotheLM2429 as wellas the voltagestressattheoutputsofthedevice.R2 shouldbe a ½ W solidcarbontyperesistor.R1 can be a ¼ W metal orcarbonfilmtyperesistor.HavinglargevalueresistorsforR1 and R2 wouldbe desirable,butthishas theeffect ofincreasingriseand falltimes.InductorL1 iscriticaltoreducetheinitialhighfrequencyvoltagelevelsthatthe LM2429 would be subjectedto.The inductorwillnotonlyhelpprotectthedevicebutitwillalsohelpminimize riseand falltimesas wellas minimizeEMI. For properarcprotection,itisimportanttonotomitany ofthearc protectioncomponents shown inFigure13. Figure13. One Channel oftheLM2429 withtheRecommended ApplicationCircuit EFFECT OF LOAD CAPACITANCE Figure7 shows the effectof increasedloadcapacitanceon the speed of the device.Thisdemonstratesthe importanceofknowingtheloadcapacitanceintheapplication. EFFECT OF OFFSET Figure8 shows the variationinriseand falltimeswhen the outputoffsetof the deviceisvariedfrom 95V to 105VDC .The risetimeshows a variationoflessthan8% relativetothecenterdatapoint(100VDC ).The falltime shows a variationoflessthan9% relativetothecenterdatapoint.

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R TH = 117° C - 70° C = 4.1° C 11.4W OBSOLETE LM2429 www.ti.com SNOSA76D –JULY 2003–REVISED APRIL 2013 THERMAL CONSIDERATIONS Figure9 shows the performanceof the LM2429 in the testcircuitshown in Figure3 as a functionof case temperature.The figureshows thattheriseand falltimesoftheLM2429 increaseby approximately15% and 30%, respectively,as the case temperatureincreasesfrom 50°C to 90°C. This correspondsto a speed degradationof3.75% and 7.5% forevery10°C riseincase temperature. Figure10 shows thepower dissipationoftheLM2429 vs.Frequencywhen allthreechannelsofthedeviceare drivingan 8pF loadwitha 130VPP alternatingone pixelon,one pixeloffsignal.The graphassumes a 72% active time(deviceoperatingatthespecifiedfrequency)whichistypicalina TV application.The other28% ofthetime thedeviceisassumed tobe sittingattheblacklevel(165V inthiscase).Table1 alsoshows thetypicalpower dissipationoftheLM2429 forvariousvideopatternsinthe480iand 480p videoformats. Figure10, Figure11, and Table 1 give the designerthe informationneeded to determinethe heatsink requirementfortheLM2429. For example,ifan HDTV applicationuses the480p formatand "VerticalLines2 On 2 Off"isassumed tobe theworst-casepatterntobe displayed,thenthepower dissipatedwillbe 11.4W (from Table1).Figure11 shows thatthemaximum allowedcase temperatureis117°C when 11.4W isdissipated.Ifthe maximum expected ambient temperatureis 70°C, then a maximum heatsinkthermalresistancecan be calculated: (1) Thisexample assumes a capacitiveloadof8pF and no resistiveload.The designershouldnotethatiftheload capacitanceisincreasedtheAC component ofthetotalpower dissipationwillalsoincrease. NOTE A LM126X preamplifier,withriseand falltimesof about 2 ns, was used to drivethe LM2429 forthese power measurements. Using a preamplifierwithriseand falltimes slowerthan the LM126X willcause the LM2429 to dissipatelesspower than shown in Table1. OPTIMIZING TRANSIENT RESPONSE In Figure13, thereare threecomponents (R1, R2 and L1) thatcan be adjustedto optimizethe transient responseoftheapplicationcircuit.IncreasingthevaluesofR1 and R2 willslowthecircuitdown whiledecreasing overshoot.IncreasingthevalueofL1 willspeed up thecircuitas wellas increaseovershoot.Itisveryimportant touse inductorswithveryhighself-resonantfrequencies,preferablyabove 300 MHz. Ferritecoreinductorsfrom J.W. MillerMagnetics(part# 78FR_ _k) were used foroptimizingthe performanceof the devicein the TI applicationboard.The valuesshown inFigure14 and Figure15 can be used as a good startingpointforthe evaluationof the LM2429. Using a variableresistorforR1 willsimplifyfindingthe valueneeded foroptimum performanceina givenapplication.Once theoptimum valueisdetermined,thevariableresistorcan be replaced witha fixedvalue. Figure 12 shows the typicalcathode pulse response with an outputswing of 130VPP using a LM1269 preamplifier. PC BOARD LAYOUT CONSIDERATIONS For optimum performance,an adequateground plane,isolationbetween channels,good supplybypassingand minimizingunwanted feedbackare necessary.Also,thelengthofthesignaltracesfrom thepreamplifiertothe LM2429 and fromtheLM2429 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 ofitshighsmallsignalbandwidth,thepartmay oscillateina TV iffeedbackoccursaround thevideo channelthroughthechassiswiring.To preventthis,leadstothevideoamplifierinputcircuitshouldbe shielded, and inputcircuitwiringshouldbe spaced as faras possiblefromoutputcircuitwiring. Copyright© 2003–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 9 ProductFolderLinks:LM2429

SNOSA76D –JULY 2003–REVISED APRIL 2013 www.ti.com TYPICAL APPLICATION A typicalapplicationoftheLM2429 isshown intheschematicfortheTI demonstrationboard inFigure14 and Figure15. Used in conjunctionwithan LM126X preamplifier,a completevideochannelfrom inputto CRT cathodecan be achieved.PerformanceisidealforDTV applications.The TIdemonstrationboardcan be used to evaluatetheLM126X/LM2429 combinationina TV. TIDEMONSTRATION BOARD Figure16 shows theroutingand component placementon theTI LM126X/LM2429 demonstrationboard.This board providesa good example ofa layoutthatcan be used as a guideforfuturelayouts.Note thelocationof thefollowingcomponents:

• C19 — VCC bypasscapacitor,locatedveryclosetopin2 and groundpins
• C20 — VBB bypasscapacitor,locatedclosetopin11 and ground
• C46, C48 — VCC bypasscapacitors,nearLM2429 and VCC clamp diodes.Veryimportantforarcprotection. The routingof the LM2429 outputsto the CRT isverycriticalto achievingoptimum performance.Figure17 shows theroutingand component placementfrompin10 (V1OUT )oftheLM2429 tothebluecathode.Note that thecomponents areplacedso thattheyalmostlineup fromtheoutputpinoftheLM2429 tothebluecathodepin of the CRT connector.Thisisdone to minimizethe lengthof the videopath between thesetwo components. Note alsothatD8, D9, R24 and D6 areplacedtominimizethesizeofthevideonodes thattheyareattachedto. Thisminimizesparasiticcapacitanceinthe videopath and alsoenhances the effectivenessof the protection diodes.The anode ofprotectiondiodeD8 isconnecteddirectlytoa sectionofthetheground planethathas a shortand directpath to the LM2429 ground pins.The cathode of D9 is connected to VCC very closeto decouplingcapacitorC48 which is connected to the same sectionof the ground plane as D8. The diode placementand routingisvery importantforminimizingthe voltagestresson the LM2429 duringan arcover event.Lastly,noticethatS3 isplacedveryclosetothebluecathodeand istieddirectlytoCRT ground. Thisdemonstrationboarduses largePCB holestoaccommodate socketpins,whichfunctiontoallowformultiple insertionsof the LM2429 in a convenientmanner. To benefitfrom the enhanced LM2429 package withthin leads,the deviceshouldbe securedinsmallPCB holesto optimizethe metal-to-metalspacingbetween the leads.

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www.ti.com SNOSA76D –JULY 2003–REVISED APRIL 2013 Figure14. LM126X/LM242X/LM248X DemonstrationBoard Schematic Copyright© 2003–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 11 ProductFolderLinks:LM2429

SNOSA76D –JULY 2003–REVISED APRIL 2013 www.ti.com Figure15. LM126X/LM242X/LM248X DemonstrationBoard Schematic (continued)

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www.ti.com SNOSA76D –JULY 2003–REVISED APRIL 2013 Figure16. LM126X/LM242X/LM248X DemonstrationBoard Layout Figure17. Trace Routing and Component Placement forBlue Channel Output Copyright© 2003–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 13 ProductFolderLinks:LM2429

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REVISION HISTORY

Changes from RevisionC (April2013)toRevisionD Page

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