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User's Guide SBOU048C –April2007–RevisedApril2013 XTR111 DemonstrationFixtureUser's Guide ThisEVM featurestheXTR111 voltage-to-currentconverterintegratedcircuitand allowsforevaluationin a varietyof configurations.This user’s guide describesthe characteristics,operation,and use of the XTR111EVM evaluationboard.Itdiscusseshow to set up and configurethe hardware and reviews variousaspects of the partsoperation.Throughout thisdocument the terms demonstrationfixture, evaluationboard,evaluationmodule,and EVM aresynonymous withtheXTR111EVM. Thisuser’s guide also includesinformationregardingoperatingprocedures,input/outputconnections,an electrical schematic,printedcircuitboard(PCB) layout,and a partslistfortheEVM. The followingrelateddocuments areavailablethroughtheTexas Instrumentsweb siteatwww.ti.com. Table1.RelatedDocumentation from Texas Instruments Document LiteratureNumber XTR111 ProductData Sheet SBOS375 QFN /SON PCB AttachmentApplicationNote SLUA271 Quad FlatpackNo-Lead LogicPackages ApplicationNote SCBA017

Contents

1 Overview

The XTR111 isa precisionvoltage-to-currentconverterdesignedforstandard0-mA to20-mA or4-mA to 20-mA analogsignals,butcan sourceup to36 mA. The ratiobetween inputvoltageand outputcurrentis setby a singleresistor,R SET .Thisreferenceresistorisan externaldevicebecause absoluteaccuracyis requiredand performancecan be selectedtomeet applicationrequirements.A few featuresofthe XTR111 include:

  • An externalP-MOSFET ensureshighoutputresistanceand a broadcompliancevoltagerange extendingfrom2 V belowthepositivesupply(VSP) tovoltageswellbelowthenegativesupply(GND).
  • An adjustable3-V to15-V subregulatoroutputprovidesthesupplyvoltageforadditionalcircuitry.
  • An errorflag(EF) isprovidedtoindicatefaultconditionson thecurrentoutput.Thisflagindicatesopen loadorhighloadresistance.
  • The XTR111 alsoprovidesoutputdisablecontrol(OD).OD must be assertedlowtoactivatethe output. The XTR111 isavailableineithera DFN surface-mountpackage oran MSOP PowerPAD ™ package. PowerPAD isa trademarkofTexas Instruments. 1SBOU048C –April2007–RevisedApril2013 XTR111 DemonstrationFixtureUser's Guide SubmitDocumentationFeedback Copyright© 2007–2013,Texas InstrumentsIncorporated

Hardware Features www.ti.com

2 Hardware Features

Thissectiondescribesthehardwarefeaturesfoundon theXTR111EVM.

2.1 XTR111EVM

The XTR111EVM isused forthebasicfunctionalevaluationoftheXTR111. The EVM providesthe followingfeatures:

  • Easy handlingofthesmallDFN package.The DFN deviceisalreadysolderedtothelandingpattern on thePCB. A mechanicaldrawingoftherecommended landpatterncan be foundattheend ofthe XTR111 productdatasheet.
  • Easy accesstoalldevicepins.
  • Easily-configurabledigitalinputs(OD and EF) todisabletheoutput,modifytheoutputcircuitfor voltageoutput,orapplya 4-mA signalshift.
  • LED indicatorfortheerrorflag,EF.
  • Outputprotectionand filteringcircuitry. The XTR111EVM isinitiallyconfiguredtoa basicsetupfor0 mA to20 mA operationwitha 0-V to5-V input.Note thatalthoughtheaccuracyofthegainsettingresistor,R SET ,used intheEVM is0.1%,the XTR111 devicehas greateraccuracy.The remainingresistorsarestandard1%. The voltageregulatoris setto5 V. The EVM requiresone externalpower-supplyvoltagewitha rangeof8 V to40 V. RefertotheXTR111 productdatasheetforcomprehensiveinformationabouttheXTR111 and possible deviceconfigurations.Figure1 shows theXTR111 EVM. Figure1.XTR111EVM

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www.ti.com Hardware Features

2.2 ExternalConnections

2.2.1 Power Supply

The power-supplyconnectionsfortheEVM arelocatedon theTB1 terminalblock.The validpower- supplyrangeis+7 V to+44 V.The supplieisdecoupledwitha 10-µF tantalumcapacitor,as wellas a 1-µF ceramiccapacitornearthedevice.The XTR111EVM alsocontainstestpointsforthesupply voltageand groundlocatednexttoTB1.

2.2.2 SignalInput

TerminalblockTB4 isused forthenoninvertingsignalinput,VIN.The validrangeisfrom0 V to+12 V. A testpointconnectedtoVIN islocatednexttoTB4.

2.2.3 VoltageRegulator

The XTR111 providesan externally-adjustablevoltageregulatorthatcan provideup to5 mA of current.The regulatorhas drive(REGF) and sense (REGS) inputs.Sense inputREGS isreferencedto 3 V,representingthelowestadjustablevoltagelevel.An externalresistordividersetsthedriveinput, REGF. FortheXTR111EVM, REGF issetto5 V.REGF (named VREG on theXTR111EVM), is accessiblethroughterminalblockTB3 and by a testpointlabeledVREG.

2.2.4 Output

The XTR111 isdesignedforuse witha discretep-channelMOSFET (Q3).ThisFET extendsthe voltagecomplianceforthecontrolledcurrenttoa potentialwellbelowthenegativesupplyvoltage.The currentoutputfortheXTR111EVM islocatedatterminalblockTB2. A testpointconnectedtoIOUT is locatednexttoTB2. The XTR111EVM can be configuredfora voltageoutputby shuntingJ2.There aretwo testpointsconnectedtothevoltageoutputcircuit.The VOUT testpointisplaceddirectlyatthe node oftheresistiveload,and VOUT_F providesa basicfilterfortheoutput.

2.2.5 AdditionalTestPoints

The followinglistshows additonaltestpoints:

  • OD isconnectedtotheoutputdisablepinoftheXTR111. To disabletheoutput,pulltheOD pinhigh by shuntingJ1.
  • EF isconnectedtotheerrorflagpinoftheXTR111. The EF pinisactivelow.When thereisan error, EF ispulledlowand theLED circuitisenabled.

2.3 Jumper ConfigurationSettings

Jumper configurationsfortheXTR111EVM areshown inSection3 Table2.XTR111EVM Jumper Settings Jumper Function J1 ConnectsOD totheonboard5-V supply,disablingtheoutput. J2 Configuresthecurrentoutputtoa voltageoutput. J3 Appliesa 4-mA inputsignalshift. 3SBOU048C –April2007–RevisedApril2013 XTR111 DemonstrationFixtureUser's Guide SubmitDocumentationFeedback Copyright© 2007–2013,Texas InstrumentsIncorporated

BasicEVM Configuration www.ti.com

3 Basic EVM Configuration

3.1 EVM Setup

Followtheseprocedurestosetup and use theXTR111EVM:

  • Remove jumperJ1 toenabletheoutput.
  • Connecta power supplyconfiguredfor+24 V and GND toterminalblockTB1.
  • Enablethepower supply.Expecta supplycurrentoflessthan6 mA and an outputvoltagenear ground.
  • Applya 0-V to5-V signaltoVIN,locatedon terminalblockTB4.
  • Measure IOUT atterminalblockTB2.
  • ConnectJ2 toplacea resistiveloadon theXTR111 outputinordertomeasure thevoltageatVOUT or VOUT_F. The XTR111EVM configurationsforcurrentand voltageoutputsareshown inFigure2 and Figure3, respectively. Figure2.CurrentOutput Setup

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www.ti.com BasicEVM Configuration Figure3.VoltageOutput Setup 5SBOU048C –April2007–RevisedApril2013 XTR111 DemonstrationFixtureUser's Guide SubmitDocumentationFeedback Copyright© 2007–2013,Texas InstrumentsIncorporated

Schematic,PCB Layout,and BillofMaterials www.ti.com

4 Schematic,PCB Layout,and BillofMaterials

4.1 Schematic

The schematicfortheXTR111EVM can be seen inFigure4. Figure4.Schematic

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www.ti.com Schematic,PCB Layout,and BillofMaterials

4.2 PCB Layout

The PCB layoutfortheXTR111EVM can be seen inFigure5. Figure5.PCB Layout 7SBOU048C –April2007–RevisedApril2013 XTR111 DemonstrationFixtureUser's Guide SubmitDocumentationFeedback Copyright© 2007–2013,Texas InstrumentsIncorporated

Schematic,PCB Layout,and BillofMaterials www.ti.com

4.3 BillofMaterials

The billofmaterialsfortheXTR111EVM can be seen inTable3. Table3.BillofMaterials Item Manufacturer Supplier No. Qty Ref Des Description Manufacturer PartNumber PartNumber IC CONV/TX PREC VOLT-CURR 10-1 1 U1 Texas Instruments XTR111AIDRCT N/ASON 2 1 U2 IC REG LDO 5V .1A8MSOP Texas Instruments TPS7A1650DGNR N/A TB1, TB2, TERM BLOCK 2POS SIDE ENT A98036-ND3 4 TE Conectivity 1776275-2TB3, TB4 3.5MM 4 1 Q1 MOSFET P-CH 60V 900MA SOT23-3 DiodesInc ZXMP6A13FTA ZXMP6A13FCT-ND 5 1 Q2 TRANSISTOR GP PNP AMP SOT-23 FairchildSemiconductor MMBT5087 MMBT5087CT-ND 6 1 Q3 MOSFET P-CH 60V 1.9ASOT-223 InfineonTechnologies BSP170P L6327 BSP170PL6327INCT-ND 7 1 C1 CAP TANT 10UF 50V 20% 2917 Kermet T491X106M050ZT 495-2288-1-ND CAP CER 10000PF 100V 5% X7R8 3 C2, C3, C4 AVX Corporation 08051C103JAT2A 478-3745-1-ND0805 9 1 C5 CAP CER 0.47UF 50V 10% X7R 0805 AVX Corporation 08055C474KAT2A 478-5033-1-ND 10 1 C6 CAP CER 1UF 50V 10% X5R 0805 TaiyoYuden UMK212BJ105KG-T 587-2229-1-ND 11 1 C7 CAP CER 10UF 6.3V10% X7R 0805 AVX Corporation 08056C106KAT2A 478-5322-1-ND R1, R4, PanasonicElectronic12 4 RES 10.0KOHM 1/8W 1% 0805 SMD ERJ-6ENF1002V P10.0KCCT-NDR7, R8 Components PanasonicElectronic13 1 R2 RES 100K OHM 1/8W 1% 0805 SMD ERJ-6ENF1003V P100KCCT-NDComponents PanasonicElectronic14 2 R3, R5 RES 15.0OHM 1/8W 1% 0805 SMD ERJ-6ENF15R0V P15.0CCT-NDComponents PanasonicElectronic15 1 R6 RES 40.2KOHM 1/8W 1% 0805 SMD ERJ-6ENF4022V P40.2KCCT-NDComponents PanasonicElectronic16 1 R9 RES 5.62KOHM 1/8W 1% 0805 SMD ERJ-6ENF5621V P5.62KCCT-NDComponents PanasonicElectronic17 1 R10 RES 1.00KOHM 1/8W 1% 0805 SMD ERJ-6ENF1001V P1.00KCCT-NDComponents PanasonicElectronic18 1 R11 RES 8.25KOHM 1/8W 1% 0805 SMD ERJ-6ENF8251V P8.25KCCT-NDComponents PanasonicElectronic19 1 RSET RES 2.49KOHM 1/8W .1% 0805 SMD ERA-6AEB2491V P2.49KDACT-NDComponents PanasonicElectronic20 1 RL1 RES 249 OHM 1/8W 1% 0805 SMD ERJ-6ENF2490V P249CCT-NDComponents VishaySemiconductor21 1 D1 DIODE SCHOTTKY 1A 60V SMA SS16-E3/5AT SS16-E3/61TGICT-NDDiodesDivision PanasonicElectronic22 1 D2 LED RED HIGH BRIGHT ESS SMD LNJ237W82RA LNJ237W82RACT-NDComponents DIODE TVS 40V 400W BIDIR 5%23 1 D3 LittlefuseInc SMAJ40CA SMAJ40CALFCT-NDSMA EF, VIN, TEST POINT PC COMPACT .063"D24 13 GND, KeystoneElectronics 5005 5005K-NDREDVREG 25 3 N/A SHUNT LP W/HANDLE 2 POS 30AU TE Connectivity 881545-2 A26242-ND CONN HEADER 50POS .100"SGL26 3 J1,J2,J3 Samtec Inc TSW-150-07-G-S SAM1029-50-NDGOLD BUMPON CYLINDRICAL .50X.1427 4 Bumpons 3M SJ-5012(BLACK) SJ5012-0-NDBLACK

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www.ti.com RevisionHistory RevisionHistory NOTE: Page numbers forpreviousrevisionsmay differfrompage numbers inthecurrentversion. 9SBOU048C –April2007–RevisedApril2013 RevisionHistory SubmitDocumentationFeedback Copyright© 2007–2013,Texas InstrumentsIncorporated

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