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CX35-36-CY

Texas Instruments

Using the PWR091EVM Dual-Output DC/DC Analog With PMBus Interface

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PWR091EVM TI1 | Alldatasheet

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PDF pages: 49

Technical content

Datasheet sections

1 Description
1.1 TypicalApplications
1.2 Features
2 ElectricalPerformance Specifications
3 Schematic
4 TestSetup
4.1 Testand ConfigurationSoftware
4.2 TestEquipment
4.3 Recommended TestSetup
4.4 USB InterfaceAdapterand Cable
4.5 ListofTestPoints
5 EVM ConfigurationUsing theFusion GUI
5.1 ConfigurationProcedure
6 TestProcedure
6.1 Line/LoadRegulationand EfficiencyMeasurement Procedure
6.2 ControlLoop Gain and Phase Measurement Procedure
6.3 Efficiency
6.4 EquipmentShutdown
7 Performance Data and TypicalCharacteristicCurves
7.1 Efficiency
7.2 Load Regulation
7.3 Bode Plot
7.4 TransientResponse
7.5 OutputRipple
7.6 HDRV and SwitchNode Voltage
7.7 TurnonWaveform
8 EVM Assembly Drawing and PCB Layout
9 BillofMaterials
10 Screen Shots
10.1 FusionGUI ScreenShots

Using thePWR091EVM Dual-OutputDC/DC Analog With PMBus Interface User's Guide LiteratureNumber: SLVU638 January2012

www.ti.com ListofFigures

4 ListofFigures SLVU638 –January2012

www.ti.com ListofTables

6 ListofTables SLVU638 –January2012

User's Guide SLVU638 –January2012 Using thePWR091EVM Dual-OutputDC/DC Analog With PMBus Interface The PWR091EVM evaluationmodule uses theTPS40422. The TPS40422 isa dual-channel,synchronous buck controllerthatoperatesfrom a nominal4.5-Vto 20-V supply.This controllerisan analog PWM controllerthatallowsprogramming and monitoringviathe PMBus interface.Itcan be used as a dual, independentoutputora dual-phaseoutputcontroller.

1 Description

The PWR091EVM isdesignedas a dual-outputconverter.Ituses a nominal12-V bus toproducea regulated1.2-Voutputatup to20 A ofloadcurrent,and a regulated3.3-Voutputatup to15 A ofload current.The PWR091EVM demonstratestheTPS40422 ina typicallow-voltageapplicationwhileproviding a number oftestpointstoevaluatetheperformanceoftheTPS40422.

1.1 TypicalApplications

Smart power systems
Power supplymodules
Communicationsequipment
Computingequipment

1.2 Features

Regulated1.2-Voutputup to20-Adc,steady-stateoutputcurrent
Regulated3.3-Voutputup to15-Adc,steady-stateoutputcurrent
Bothoutputsaremarginableand trimmableviathePMBus interface. – Programmable:UVLO, SoftStart,and EnableviathePMBus interface – Programmable overcurrentwarningand faultlimitsand programmableresponsetofaultsviathe PMBus interface – Programmable overvoltagewarningand faultlimitand programmableresponsetofaultsviathe PMBus interface – Programmable high-and low-outputmarginvoltageswitha maximum rangeof+10%, –20% of nominaloutputvoltage
Convenienttestpointsforprobingcriticalwaveforms 7SLVU638 –January2012 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SubmitDocumentationFeedback Copyright© 2012,Texas InstrumentsIncorporated

ElectricalPerformanceSpecifications www.ti.com

2 ElectricalPerformance Specifications

Table1.PWR091EVM-001 ElectricalPerformance Specifications PARAMETER TEST CONDITIONS MIN TYP MAX UNITS INPUT CHARACTERISTICS Voltagerange VIN 8 12 14 V Maximum inputcurrent VIN = 8 V,IO1 = 20 A,IO2 = 15 A 10 15 A No loadinputcurrent VIN = 14 V,IO1 = 0 A,IO2 = 0 A 100 mA OUTPUT CHARACTERISTICS VOUT1 Outputvoltage Outputcurrent= 10 A 1.2 V VOUT2 Outputvoltage Outputcurrent= 10 A 3.3 V IOUT1 Outputloadcurrent IOUT_min toIOUT_max 0 20 A IOUT2 Outputloadcurrent IOUT_min toIOUT_max 0 15 A Lineregulation:Inputvoltage= 8 V to14 V 0.5% Outputvoltageregulation Load regulation:Outputcurrent= 0 A toIOUT_max ,both 0.%5outputs VOUT1 Outputvoltageripple VIN = 12 V,IOUT = 20 A 30 mVpp VOUT2 Outputvoltageripple VIN = 12 V,IOUT = 15 A 30 mVpp VOUT1 Outputovercurrent 25 A VOUT2 Outputovercurrent 20 A SYSTEMS CHARACTERISTICS Switchingfrequency FSW 460 kHz VOUT1 Peak efficiency VIN = 8 V,IO1 = 10 A,VOUT2 disabled,FSW = 300 kHz 92% VOUT2 Peak efficiency VIN = 8 V,IO2 = 8.5A,VOUT1 disabled,FSW = 300 kHz 95% VOUT1 Full-loadefficiency VIN = 8 V,IO1 = 10 A,VOUT2 disabled,FSW = 300 kHz 90% VOUT2 Full-loadefficiency VIN = 8 V,IO2 = 8.5A,VOUT1 disabled,FSW = 300 kHz 93% Operatingtemperature Toper 25 ºC

8 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

www.ti.com Schematic

3 Schematic

TestSetup www.ti.com

4 TestSetup

4.1 Testand ConfigurationSoftware

To change any ofthedefaultconfigurationparameterson theEVM, itisnecessarytoobtaintheTIFusion DigitalPower Designersoftware.

4.1.1 Description

The FusionDigitalPower Designeristhegraphicaluserinterface(GUI)used toconfigureand monitorthe Texas InstrumentsTPS40422 power controlleron thisevaluationmodule.The applicationuses the PMBus protocoltocommunicatewiththecontrolleroverserialbus by way ofa TIUSB adapter(see Figure3).

4.1.2 Features

Some ofthetasksyou can performwiththeGUI include:

Turnon oroffthepower supplyoutput,eitherthroughthehardwarecontrollineorthePMBus operationcommand.
Monitorreal-timedata.Itemssuch as inputvoltage,outputvoltage,outputcurrent,temperature,and warningsand faultsarecontinuouslymonitoredand displayedby theGUI.
Configurecommon operatingcharacteristicssuch as VOUT trimand margin,UVLO, soft-starttime, warningand faultthresholds,faultresponse,and ON/OFF. Thissoftwareisavailablefordownloadathttp://www.ti.com/tool/fusion_digital_power_designer

4.2 TestEquipment

VoltageSource:The inputvoltagesourceVIN must be a 0-V to14-V variabledc sourcecapableof supplying15 Adc.ConnectVIN toJ5 as shown inFigure2. Multimeters:Itisrecommended touse threeseparatemultimetersas shown inFigure2.One meterto measure Vin,one tomeasure Vout1and thethirdtomeasure Vout2. Output Load: Two variableelectronicloadsarerecommended forthetestsetupas shown inFigure2. Load 1 must be capableof25 A atvoltagesas lowas 0.9V.Load 2 must be capableof20 A atvoltages as lowas 3 V. Oscilloscope:An oscilloscopeisrecommended formeasuringoutputnoiseand ripple.Outputripplemust be measured usinga Tip-and-Barrelmethod orbetteras shown inFigure4.Thescope must be adjusted to20-MHz bandwidth,ac couplingat50 mV/division,and must be setto1-µs/division. Fan: Duringprolongedoperationathighloads,itmay be necessarytoprovideforcedaircoolingwitha smallfanaimed attheEVM. The temperatureofthedeviceson theEVM must be maintainedatlessthan 105°C. USB-to-GPIO InterfaceAdapter:A communicationsadapterisrequiredbetween theEVM and thehost computer.ThisEVM was designedtouse theTexas InstrumentsUSB-to-GPIO Adapter(seeFigure3). Thisadaptercan be purchasedathttp://www.ti.com/tool/usb-to-gpio. Recommended Wire Gauge: Itisrecommended thatthevoltagedropintheloadwiresdoes notexceed 0.2V totalinordertokeep thevoltageattheloadabove 1 V.See thefollowingtableforrecommended wiregauge and lengthtoachievea voltagedropofno more than0.2V ata 20-A load. Ohms per Foot Load Wires Combined Length Each Wire LengthAWG Gauge (Ω) (Ft) (Ft) 12 1.59E-3 6.30 3.15 14 2.53E-3 3.96 1.98 16 4.02E-3 2.49 1.25 18 6.39E-3 1.57 0.78

10 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

www.ti.com TestSetup As an example,ifAWG 12 wireisused,no more than3.15feetofwiremust be used between theEVM and theload.

4.3 Recommended TestSetup

TestSetup www.ti.com

4.4 USB InterfaceAdapter and Cable

Figure3.Texas InstrumentsUSB-to-GPIO Adapter and Connections Figure4.Tipand BarrelMeasurement

4.5 ListofTestPoints

12 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

www.ti.com TestSetup Table2.The FunctionsofEach TestPoints TestPoint Type Name Description TP1 T-H Loop PGOOD2 Power Good signalforVout2. TP2 T-H Loop VIN Generalinputvoltagemeasurement. TP3 T-H Loop VOUT1 Tipand barrelpointforVout1. TP6 T-H Loop PGND Tipand barrelpointforVout1 return. TP7 T-H Loop PGND Generalinputvoltagemeasurement. TP11 T-H Loop VOUT2 Tipand barrelpointforVout2. TP13 T-H Loop AGND ReturnforPGOOD signals. TP14 T-H Loop PGND Tipand barrelpointforVout2 return. TP15 T-H Loop PGOOD1 Power Good signalforVout1. TP16 T-H Loop BPEXT PointtoinjectBP External. TP18 T-H Loop PREBIAS2 PointtoinjectPrebiasforoutput2. TP19 T-H Loop PREBIAS1 PointtoinjectPrebiasforoutput1. TP20 T-H Loop PGND ReturnforPrebias2. TP21 T-H Loop PGND ReturnforPrebias1. TP22 T-H Loop PGND ReturnforBP External. TP4 SMT AGND ReturnforSYNC signal. TP8 SMT INPUT1 Inputforcontrolloopmeasurements forVout1. TP9 SMT OUTPUT1 OutputofVout1 forcontrolloopmeasurements. TP10 SMT VOUT2 OutputofVout2 forcontrolloopmeasurements. TP12 SMT INPUT2 Inputforcontrolloopmeasurements forVout2. TP17 SMT SYNC PointtoinjectSYNC signal. TP5 Copper Dot VIN Vin+measurement pointforefficiencyofVout1. TP23 Copper Dot PGND Vin-measurement pointforefficiencyofVout1. TP24 Copper Dot VIN Vin+measurement pointforefficiencyofVout2. TP25 Copper Dot PGND Vin-measurement pointforefficiencyofVout2. TP26 Copper Dot VOUT2 Vout+ measurement pointforefficiencyofVout2. TP27 Copper Dot VOUT1 Vout+ measurement pointforefficiencyofVout1. 13SLVU638 –January2012 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SubmitDocumentationFeedback Copyright© 2012,Texas InstrumentsIncorporated

EVM ConfigurationUsingtheFusionGUI www.ti.com

5 EVM ConfigurationUsing theFusion GUI

The TPS40422 on thisEVM leavesthefactorypre-configured.See Table3 fora shortlistofkey factory configurationparametersas obtainedfromtheconfigurationfile. Table3.Key FactoryConfigurationParameters Address Hex Address Dec PartID 0x1B 27 TPS40422 General Cmd ID With Phase Cmd Code Hex Encoded Hex Decoded Numeric Comments VIN_OFF 0x36 0xF014 5.00V 5 TurnOFF voltage VIN_ON 0x35 0xF01C 7.00V 7 TurnON voltage Vout 1 Comments IOUT_CAL_GAIN 0x38 0x8821 1.0071m Ω 1.0071 DCR ofoutputinductor IOUT_CAL_OFFSET 0x39 0xE000 0.0000A 0 CurrentoffsetforGUI readout IOUT_OC_FAULT_LIMIT 0x46 0xF83C 30.0A 30 OC faultlevel IOUT_OC_FAULT_RESPONSE 0x47 0x3C RestartContinuously Response toOC fault IOUT_OC_WARN_LIMIT 0x4A 0xF832 25.0A 25 OC warninglevel MFR_04 (VREF_TRIM) 0xD4 0x0000 0.000V 0 Trimvoltage Controlsignaland OPERATION commandON_OFF_CONFIG 0x02 0x02 Mode: AlwaysConverting notrequired Unit:ImmediateOff;Margin:OPERATION 0x01 0x00 Response toturnOFF triggerNone OT_FAULT_LIMIT 0x4F 0x007D 125 C 125 OT faultlevel OT_WARN_LIMIT 0x51 0x0064 100 C 100 OT warn level TON_RISE 0x61 0xE02B 2.6875ms 2.6875 Soft-starttime Vout 2 Comments IOUT_CAL_GAIN 0x38 0x8821 1.0071m Ω 1.0071 DCR ofoutputinductor IOUT_CAL_OFFSET 0x39 0xE000 0.0000A 0 CurrentoffsetforGUI readout IOUT_OC_FAULT_LIMIT 0x46 0xF832 25.0A 25 OC faultlevel IOUT_OC_FAULT_RESPONSE 0x47 0x3C RestartContinuously Response toOC fault IOUT_OC_WARN_LIMIT 0x4A 0xF828 20.0A 20 OC warninglevel MFR_04 (VREF_TRIM) 0xD4 0x0000 0.000V 0 Trimvoltage Controlsignaland OPERATION commandON_OFF_CONFIG 0x02 0x02 Mode: AlwaysConverting notrequired Unit:ImmediateOff;Margin:OPERATION 0x01 0x00 Response toturnOFF triggerNone OT_FAULT_LIMIT 0x4F 0x007D 125 C 125 OT faultlevel OT_WARN_LIMIT 0x51 0x0064 100 C 100 OT warn level TON_RISE 0x61 0xE02B 2.6875ms 2.6875 Soft-starttime IfitisdesiredtoconfiguretheEVM tosettingsotherthanthefactorysettingsshown inTable3,theTI FusionDigitalPower Designersoftwarecan be used forreconfiguration.Itisnecessarytohave input voltageappliedtotheEVM priortolaunchingthesoftwareso thattheTPS40422 may respondtotheGUI and theGUI can recognizetheTPS40422. The defaultconfigurationfortheEVM istostartconvertingat an inputvoltageof7 V;therefore,toavoidany converteractivityduringconfiguration,an inputvoltageless than7 V must be applied.An inputvoltageof5 V isrecommended.

5.1 ConfigurationProcedure

Adjusttheinputsupplytoprovide5 Vdc,currentlimitedto1 A. 2. ApplytheinputvoltagetotheEVM. See Figure2 and Figure3 forconnectionsand testsetup. 3. Launch theFusionGUI software.See thescreenshotsinSection10 formore information. 4. ConfiguretheEVM operatingparametersas desired.

14 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

www.ti.com TestProcedure NOTE: The IOUT_CAL_GAIN parameterisused by theTPS40422 inthecalculationofoutput currentlevel,and thisnumber isthedc resistanceoftheoutputinductor.Althoughthis number can be reconfigured,a number entrythatdoes notmatch theactualDCR ofthe inductoron theEVM willresultincurrentreportinginaccuracy.ThisalsoaffectsOC Fault and OC Warn performance. The TON_RISE parametermay affectproperstart-upiftherisetimeand outputcapacitance bank resultina currentthatexceedstheOC Faultlevel.The start-upsurgecurrentinthe outputcapacitancebank isadded totheloadcurrent,so thesum ofthesetwo currentsmust be lessthantheOC Faultlevelforproperstart-up.

6 TestProcedure

6.1 Line/LoadRegulationand EfficiencyMeasurement Procedure

Setup theEVM as describedinSection4.3and Figure2. 2. Ensurethatbothelectronicloadsaresettodraw 0 Adc. 3. IncreaseVinfrom0 V to12 V usingDMM1 tomeasure inputvoltage. 4. Use DMM2 tomeasure outputvoltageVout1. 5. Varytheloadfrom0 Adc to20 Adc.Vout1must remaininregulationas definedinTable1. 6. VaryVinfrom8 V to14 V.Vout1must remaininregulationas definedinTable1. 7. Decreasetheloadto0 A. 8. Use DMM3 tomeasure outputvoltageVout2. 9. Varytheloadfrom0 Adc to15 Adc.Vout1must remaininregulationas definedinTable1. 10.VaryVinfrom8 V to14 V.Vout2must remaininregulationas definedinTable1. 11.Decreasetheloadto0 A. 12.DecreaseVinto0 V.

6.2 ControlLoop Gain and Phase Measurement Procedure

The PWR091EVM includesa 49.9-Ω seriesresistorinthefeedbackloopforbothVout1and Vout2.These resistorsareused forloopresponseanalysisand areaccessibleatthetestpointsTP8 and TP9 forVout1, and TP10 and TP12 forVout2.Those testpointsmust be used duringloopresponsemeasurements as theinjectionpointsfortheloopperturbation.See theshortdescriptionslistedinTable4. Table4.ListofTestPointsforLoop Response Measurements TestPoint Node Name Description Comment Inputtofeedbackdividerof The amplitudeoftheperturbationatthisnode must be limitedtoTP8 INPUT1 Vout1 lessthan100 mV. Bode plotdatacan be measured by a networkanalyzerasTP9 OUTPUT1 ResultingoutputofVout1 TP9/TP8. Inputtofeedbackdividerof The amplitudeoftheperturbationatthisnode must be limitedtoTP12 INPUT2 Vout2 lessthan100mV. Bode plotdatacan be measured by a networkanalyzerasTP10 VOUT2 ResultingoutputofVout2 TP10/TP12. Measure onlyone outputata timewiththefollowingprocedure: 1. Setup theEVM as describedinSection4.3and Figure2. 2. ForVout1,connectthenetworkanalyzer’s isolationtransformerfromTP8 toTP9. 3. Connecttheinputsignalmeasurement probetoTP8. Connectoutputsignalmeasurement probeto TP9. 4. ConnectthegroundleadsofbothprobechannelstoTP4. 5. On thenetworkanalyzer,measure theBode plotdataas TP9/TP8 (Out/In).The frequencysweep must 15SLVU638 –January2012 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SubmitDocumentationFeedback Copyright© 2012,Texas InstrumentsIncorporated

PerformanceData and TypicalCharacteristicCurves www.ti.com be limitedtolessthantheswitchingfrequencydividedby 2 (Fsw/2). 6. ForVout2,connectthenetworkanalyzer’s isolationtransformerfromTP12 toTP10. 7. Connecttheinputsignalmeasurement probetoTP12. Connectoutputsignalmeasurement probeto TP10. 8. ConnectthegroundleadsofbothprobechannelstoTP4. 9. On thenetworkanalyzer,measure theBode plotdataas TP10/TP12 (Out/In).The frequencysweep must be limitedtolessthantheswitchingfrequencydividedby 2 (Fsw/2). 10.DisconnecttheisolationtransformerfromtheBode plottestpointsbeforemaking other measurements,because thesignalinjectionintothefeedbackloopmay interferewiththeaccuracyof othermeasurements.

6.3 Efficiency

To measure theefficiencyofthepower trainon theEVM, itisimportanttomeasure thevoltagesatthe correctlocation.Thisisnecessarybecause otherwisethemeasurements willincludelossesinefficiency thatarenotrelatedtothepower trainitself.Lossesincurredby thevoltagedropinthecoppertracesand intheinputand outputconnectorsarenotrelatedtotheefficiencyofthepower train,and theymust notbe includedinefficiencymeasurements. When measuringtheefficiencyofVout1,Vout2must be disabledby theuserviatheFusionGUI. Likewise,when measuringtheefficiencyofVout2,Vout1must be disabledby theuser.See thelistin Table5 fortheproperlocationstomeasure efficiency. Table5.ListofTestPointsforEfficiencyMeasurements TestPoint Node Name Description Comment TP5 VIN Measurement pointforVIN +VE Copper dotathigh-sideFET drain TP23 PGND Measurement pointforVIN –VE Copper dotatlow-sideFET source TP27 VOUT1 Measurement pointforVOUT1 +VE Copper dotatoutputinductor,dc side TP23 PGND Measurement pointforVOUT1 –VE Copper dotatlow-sideFET source TP24 VIN Measurement pointforVIN +VE Copper dotathigh-sideFET drain TP25 PGND Measurement pointforVIN –VE Copper dotatlow-sideFET source TP26 VOUT2 Measurement pointforVOUT2 +VE Copper dotatoutputinductor,dc side TP25 PGND Measurement pointforVOUT2 –VE Copper dotatlow-sideFET source Inputcurrentcan be measured atany pointintheinputwires,and outputcurrentcan be measured anywhere intheoutputwiresoftheoutputbeingmeasured.Usingthesemeasurement pointsresultin efficiencymeasurements thatdo notincludelossesdue totheconnectorsand PCB traces.

6.4 Equipment Shutdown

Reduce theloadcurrenton bothoutputsto0 A. 2. Reduce inputvoltageto0 V. 3. Shutdown theexternalfanifinuse. 4. Shutdown equipment.

7 Performance Data and TypicalCharacteristicCurves

Figure5 throughFigure25 presenttypicalperformancecurvesforthePWR091EVM.

16 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

Efficiency - % 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 I - Output Current - AO V = 8 VI V = 12 VI V = 14 VI V = 1.2 V, F = 300 kHz O SW 100 Efficiency - % I - Output Current - AO 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 V = 8 VI V = 12 VI V = 14 VIV = 3.3 V, F = 300 kHz O SW www.ti.com PerformanceData and TypicalCharacteristicCurves

7.1 Efficiency

Figure5.Efficiencyof1.2-VOutput vs Lineand Load Figure6.Efficiencyof3.3-VOutput vs Lineand Load 17SLVU638 –January2012 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SubmitDocumentationFeedback Copyright© 2012,Texas InstrumentsIncorporated

1.2006 1.2007 1.2008 1.2009 1.2010 1.2011 1.2012 1.2013 1.2014 1.2015 1.2016 V - Output Voltage - VO 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 I - Output Current - AO V = 8 VI V = 12 VI V = 14 VI I - Output Current - AO 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 3.322 3.323 3.324 3.325 3.326 3.327 3.328 3.329 3.330 V - Output Voltage - VO V = 8 VI V = 12 VI V = 14 VI PerformanceData and TypicalCharacteristicCurves www.ti.com

7.2 Load Regulation

Figure7.Load Regulationof1.2-VOutput Figure8.Load Regulationof3.3-VOutput

18 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

-60 -40 -20 100 120 140 -30 -20 -10 100 1k 10k 100k Phase (Deg)Gain - dB f - Frequency - Hz

8 V Phase

12 V Phase

14 V Phase

14 V Gain

8 V Gain

12 V Gain

-30 -20 -10 Gain - dB -60 -40 -20 100 120 140 Phase (Deg) 100 1k 10k 100k f - Frequency - Hz www.ti.com PerformanceData and TypicalCharacteristicCurves

7.3 Bode Plot

Figure9.Bode Plotof1.2-VOutput at10-A Load Figure10.Bode Plotof3.3-VOutput at10-A Load 19SLVU638 –January2012 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SubmitDocumentationFeedback Copyright© 2012,Texas InstrumentsIncorporated

PerformanceData and TypicalCharacteristicCurves www.ti.com

7.4 TransientResponse

Ch1 = Vout1at50mV/division,Ch2 = Iout1at5A/division Figure11.TransientResponse of1.2-VOutput at8 Vin,Transientis5 A to11 A to5 A Ch1 = Vout1at50mV/division,Ch2 = Iout1at5A/division Figure12.TransientResponse of1.2-VOutput at12 Vin,Transientis5 A to11 A to5 A

20 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

www.ti.com PerformanceData and TypicalCharacteristicCurves Ch1 = Vout2at20mV/division,Ch2 = Iout2at5A/division Figure13.TransientResponse of3.3-VOutput at8 Vin,Transientis5 A to9 A to5 A Ch1 = Vout2at20mV/division,Ch2 = Iout2at5A/division Figure14.TransientResponse of3.3-VOutput at12 Vin,Transientis5 A to9 A to5 A 21SLVU638 –January2012 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SubmitDocumentationFeedback Copyright© 2012,Texas InstrumentsIncorporated

PerformanceData and TypicalCharacteristicCurves www.ti.com

7.5 Output Ripple

Ch1 = Vout1at20mV/division,Ch2 = SW Node at10V/division Figure15.Output Rippleand SW Node of1.2-VOutput at8 Vin,20-A Output Ch1 = Vout1at20mV/division,Ch2 = SW Node at10V/division Figure16.Output Rippleand SW Node of1.2-VOutput at12 Vin,20-A Output

22 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

www.ti.com PerformanceData and TypicalCharacteristicCurves Ch1 = Vout2at20mV/division,Ch2 = SW Node at10V/division Figure17.Output Rippleand SW Node of3.3-VOutput at8 Vin,15-A Output Ch1 = Vout2at20mV/division,Ch2 = SW Node at10V/division Figure18.Output Rippleand SW Node of3.3-VOutput at12 Vin,15-A Output 23SLVU638 –January2012 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SubmitDocumentationFeedback Copyright© 2012,Texas InstrumentsIncorporated

PerformanceData and TypicalCharacteristicCurves www.ti.com

7.6 HDRV and Switch Node Voltage

Ch1 = SW Node at5 V/division,Ch2 = HDRV at5 V/division Figure19.HDRV and SW Node of1.2-VOutput at8 Vin,20-A Output Ch1 = SW Node at5 V/division,Ch2 = HDRV at10 V/division Figure20.HDRV and SW Node of1.2-VOutput at12 Vin,20-A Output Ch1 = SW Node at5 V/division,Ch2 = HDRV at5 V/division Figure21.HDRV and SW Node of3.3-VOutput at8-Vin,15-A Output

24 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

www.ti.com PerformanceData and TypicalCharacteristicCurves Ch1 = SW Node at5 V/division,Ch2 = HDRV at10 V/division Figure22.HDRV and SW Node of3.3-VOutput at12 Vin,15-A Output

7.7 Turnon Waveform

Ch1 = Vout1at200 mV/division,Ch2 = Iout1at5 A/division,Ch3 = Vinat5 V/divisionCh2 (Iout)Invertedtobetter displayV and I. Figure23.Turnon Waveform of1.2-VOutput at8-V,12-V and 14-V Input,20-A Output Ch1 = Vout1at200 mV/division,Ch3 = Vinat5 V/division Figure24.Turnon Waveform of1.2-VOutput With 0.5-VPrebias,at8-V,12-V and 14-V Input,0-A Output 25SLVU638 –January2012 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SubmitDocumentationFeedback Copyright© 2012,Texas InstrumentsIncorporated

EVM Assembly Drawingand PCB Layout www.ti.com Ch1 = Vout2at500 mV/division,Ch2 = Iout2at5 A/division,Ch3 = Vinat5 V/divisionCh2 (Iout)Invertedtobetter displayV and I. Figure25.Turnon Waveform of3.3-VOutput at8-V,12-V,and 14-V Input,15-A Output Ch1 = Vout1at500 mV/division,Ch3 = Vinat5 V/division Figure26.Turnon Waveform of3.3-VOutput With 2-V Prebias,at8-V,12-V,and 14-V Input,0-A Output

8 EVM Assembly Drawing and PCB Layout

Figure27 throughFigure32 show thedesignofthePWR091EVM printed-circuitboard(PCB).

26 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

www.ti.com EVM Assembly Drawingand PCB Layout Figure27.PWR091EVM Top Layer Assembly Drawing (Top View) 27SLVU638 –January2012 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SubmitDocumentationFeedback Copyright© 2012,Texas InstrumentsIncorporated

EVM Assembly Drawingand PCB Layout www.ti.com Figure28.PWR091EVM Bottom Assembly Drawing (Bottom View)

28 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

www.ti.com EVM Assembly Drawingand PCB Layout Figure29.PWR091EVM Top Copper (Top View) 29SLVU638 –January2012 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SubmitDocumentationFeedback Copyright© 2012,Texas InstrumentsIncorporated

EVM Assembly Drawingand PCB Layout www.ti.com Figure30.PWR091EVM InternalLayer 1 (Top View)

30 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

www.ti.com EVM Assembly Drawingand PCB Layout Figure31.PWR091EVM InternalLayer 2 (Top View) 31SLVU638 –January2012 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SubmitDocumentationFeedback Copyright© 2012,Texas InstrumentsIncorporated

EVM Assembly Drawingand PCB Layout www.ti.com Figure32.PWR091EVM Bottom Copper (Bottom View)

32 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

www.ti.com BillofMaterials

9 BillofMaterials

The EVM components listaccordingtotheschematicshown in. Table6.PWR091 BillofMaterials Qty ReferenceDesignator Description Manufacturer PartNumber 2 C23 C27 0.47uF,Ceramic,16V,X5R, 10%, 0402 STD STD 3 C1 C5 C9 0.1uF,Ceramic,50V,X7R, 10%, 0603 STD STD 3 C10-12 1.0uF,Ceramic,25V,X7R, 10%, 0603 STD STD 2 C21 C25 1.2nF,Ceramic,50V,X7R, 10%, 0603 STD STD

2 C24 C33 470pF,Ceramic,50V,X7R, 10%, 0603 STD STD

2 C26 C22 120pF,Ceramic,50V,NP0, 5%, 0603 STD STD

6 C31-32 C30 C34-35 C37 1000pF,Ceramic,50V,X7R, 10%, 0603 STD STD

4 C19-20 C42-43 22uF,Ceramic,6.3V,X5R, 20%, 0805 STD STD 2 C38-39 0.1uF,Ceramic,6.3V,X5R, 20%, 0805 STD STD

9 C2-4 C6-8 C36 C40-41 22uF,Ceramic,25V,X5R, 20%, 1210 STD STD

6 C18 C15 C44-47 100uF,Ceramic,6.3V,X5R, 20%, 1210 STD STD 2 C28-29 330uF,Electrolytic,Aluminum,25V,200mohm, 270mArms, 0.406x 0.406 Panasonic EEE-TK1E331UP 4 C13-14 C16-17 330uF,PolymerCap, 330uF,6.3V,0.015Ohms, 20%, 7343(D) Kemet T520D337M006ATE015 4 J4 J6-8 33457,Lug,Solderless,#10 -#10-12AWG, Copper/Tin,Uninsulated,0.375x1.00" Std CX35-36-CY

2 D1-2 MBRS340, Diode,Schottky,3A,40V,SMC Fairchild MBRS340

2 J1-2 PEC02SAAN, Header,Male 2-pin,100milspacing,,0.100" x 2 Sullins PEC02SAAN 1 J3 AWHW10G, Header,Male 2x5-pin,100milspacing,0.100" x 5 X 2 Assmann AWHW10G-0202-T-R 2 L1-2 820nH, Inductor,SMT, 27A,Shielded,20%, 0.9mOhm, 0.512" x 0.571" Wurth 744355182 2 R1 R4 5.1,Resistor,Chip,1/10W,1%, 0603 STD STD

1 R3 0,Resistor,Chip,1/10W,1%, 0603 STD STD

1 R2 0,Resistor,Chip,1/10W,5%, 0603 STD STD

2 R5-6 2.0k,Resistor,Chip,1/10W,1%, 0603 STD STD

0 R7 R16 R21-23 R34 Open, Resistor,Chip,1/10W,1%, 0603 STD STD

3 R12 R13 R38 47.5k,Resistor,Chip,1/10W,1%, 0603 STD STD 2 R8-9 36.5k,Resistor,Chip,1/10W,1%, 0603 STD STD

11 R17 R18 R20 R24-26 R28-30 R33 10,Resistor,Chip,1/10W,1%, 0603 STD STD

1 R10 40.2k,Resistor,Chip,1/10W,1%, 0603 STD STD 3 R11 R27 R31 49.9,Resistor,Chip,1/10W,1%, 0603 STD STD

2 R15 R32 20k,Resistor,Chip,1/10W,1%, 0603 STD STD

1 R35 10.5k,Resistor,Chip,1/10W,1%, 0603 STD STD 3 R19 R37 R40 10.0k,Resistor,Chip,1/10W,1%, 0603 STD STD 2 R14 R39 4.75k,Resistor,Chip,1/10W,1%, 0603 STD STD 1 J5 ED120/2DS, TerminalBlock,2-pin,15-A,5.1mm, 0.40" x 0.35" OST ED120/2DS

1 U1 TPS40422RHA, IC,PMBUS synchronousbuck controller,QFN-40 TI TPS40422RHA

2 Q1-2 CSD87350Q5D, MOSFET, DualN-Chan,30-V,30-A,QFN-8 POWER TI CSD87350Q5D

2 Q3-4 MMBT3904, Bipolar,NPN, 40V,200mA, 200mW, SC-75 On Semi MMBT3904TT1G

1 PCB PCB, FR-4,0.062,2oz Copper alllayers.,4.00" x 4.00" STD STD 33SLVU638 –January2012 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SubmitDocumentationFeedback Copyright© 2012,Texas InstrumentsIncorporated

ScreenShots www.ti.com

10 Screen Shots

10.1 Fusion GUI Screen Shots

Figure33.FirstWindow atFusion Launch Figure34.Scan Finds Device Successfully Figure35.SoftwareLaunch Continued

34 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

www.ti.com ScreenShots Figure36.SoftwareLaunch Continued Use thisscreentoconfigure(Figure37):

OC Faultand OC Warn
OT Faultand OT Warn
Power Good Limits
Faultresponse
UVLO
On/OffConfig
SoftStarttime
Marginvoltage Figure37.FirstScreen AfterSuccessfulLaunch: Configure-Limits& On/Off Use thisscreentoconfigure(Figure38):

ScreenShots www.ti.com

IoutCalGain (DCR ofoutputchoke) Figure38.Configure-Other Use thisscreentoconfigurealloftheconfigurableparameters(Figure39).The screenalsoshows other detailslikehexadecimal(hex)encoding. Figure39.Configure-All ChangingtheOn/OffConfigpromptsa pop-upwindow withdetailsoftheoptionsFigure40).

36 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

www.ti.com ScreenShots Figure40.Configure-Limitsand On/Off-On/OffConfigPop-up Aftera change isselected,orangeU iconisdisplayedtoofferUndo Change option.Change isnot retaineduntileitherWritetoHardware orStoreUser Defaultsisselected.When WritetoHardware is selected,change iscommittedtovolatilememory and defaultsback toprevioussettingon inputpower cycle.When StoreUser Defaultsisselected,change iscommittedtononvolatilememory and becomes thenew default(Figure41). Figure41.Configure-Limitsand On/Off-On/OffConfigPop-up 37SLVU638 –January2012 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SubmitDocumentationFeedback Copyright© 2012,Texas InstrumentsIncorporated

ScreenShots www.ti.com The IoutCalGain can be typedinorscrolledtoa new value.The rangeforIoutCalGain is0.244m Ω to 15.5m Ω and theresolutionstepis30.5µΩ.Ifa valueistypedinthatisbetween theavailablediscrete steps,thetyped-invaluedoes notchange butthenearestdiscretestepisretained.The actualstepis displayedon relaunchoftheFusionGUI (Figure42). Figure42.Configure-Other-IoutCal Gain Change On/OffConfigcan alsobe configuredfromtheAllConfigscreen,and thesame processapplies (Figure43). Figure43.Configure-AllConfig-On/OffConfigPop-up

38 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

www.ti.com ScreenShots Aftermaking changes toone ormore configurableparameters,thechanges can be committedto nonvolatilememory by selectingStoreUser Defaults.Thisactionpromptsa confirmselectionpop-up,and ifconfirmed,thechanges arecommittedtononvolatilememory (Figure44). Figure44.Configure-StoreUser Defaults A scroll-downmenu intheupperrightcornercan be selectedtochange theviewscreenstoone output railortheother(Figure45). Figure45.Change Screens toOther Vout Rail 39SLVU638 –January2012 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SubmitDocumentationFeedback Copyright© 2012,Texas InstrumentsIncorporated

ScreenShots www.ti.com Inthelowerleftcorner,thedifferentviewscreenscan be changed.The viewscreenscan be changed between Configure,Monitorand Statusas needed (Figure46). Figure46.Change View Screen toMonitorScreen When theMonitorscreenisselected(Figure47),thescreenchanges todisplayreal-timedataofthe parametersthataremeasured by thecontroller.Thisscreenprovidesaccessto:

Graphs ofVout,Iout,Temperature,and Pout.As shown,Poutdisplayisturnedoff.
Start/StopPollingwhichturnson oroffthereal-timedisplayofdata.
QuickaccesstoOn/Offconfig
Controlpinactivation,and OPERATION command. As shown,because thedeviceisconfiguredfor AlwaysConverting,theseradiobuttonsareeithergrayed-outorhave no effect.
Margincontrol.
PMBus logwhichdisplaysactivityon thePMBus.
Tips& Hintswhichdisplaysadditionalinformationwhen thecursorishoveredoverconfigurable parameters. As shown,when theEVM isstilloffdue toUVLO, no outputvoltageorcurrentisdisplayed. AtfirstGUI launch,Faultsmay occurdue tocommunicationsduringpower up.These faultscan be clearedonce thedeviceisenabled.

40 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

www.ti.com ScreenShots Figure47.MonitorScreen SelectingSystem Dashboard frommid-leftscreenadds a new window whichdisplayssystem-level information(Figure48). Figure48.System Dashboard 41SLVU638 –January2012 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SubmitDocumentationFeedback Copyright© 2012,Texas InstrumentsIncorporated

ScreenShots www.ti.com When theEVM startsconvertingpower,theVoutgraphchanges scaletodisplayboththezeroand Vout level.Onlyone railcan be displayedon thegraphsatany time,buttheotherrailvoltage,current,power, and temperaturearedisplayedintheupperleftwindow.Once theEVM isconvertingand clearofany faults,selectingClearFaultsclearsany priorfaultflags(Figure49). Figure49.DisplayChange on Power Up SelectingClearFaultsclearsany priorfaultflags.Scrollingtimewindow ofVoutstillshows theturnon event(Figure50). Figure50.FaultsCleared

42 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

www.ti.com ScreenShots SelectingStatusfromlowerleftcornershows thestatusofthecontroller(Figure51). Figure51.StatusScreen Selectingthepull-downmenu File-ImportProjectfromtheupperleftmenu barcan be used toconfigure allparametersinthedeviceatonce witha desiredconfiguration,oreven revertback toa known-good configuration.Thisactionresultsina browse-typesequence where thedesiredconfigfilecan be located and loaded(Figure52). Figure52.ImportProject/ImportConfigurationFile 43SLVU638 –January2012 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SubmitDocumentationFeedback Copyright© 2012,Texas InstrumentsIncorporated

ScreenShots www.ti.com SelectingStoreUser ConfigurationtoFlashMemory fromtheDevicepull-downmenu has thesame functionalityas theStoreUser DefaultsbuttonfromwithintheConfigurescreen.Itresultsincommitting thecurrentconfigurationtononvolatilememory (Figure53). Figure53.StoreConfigTo Memory SelectingData Logging(Figure54)fromtheToolsdrop-downmenu enablestheloggingofcommon operatingvaluessuch as Vout,Iout,and Temperatureforbothoutputrails.The userispromptedtoselect a locationforthefiletobe storedas wellas thetypeoffile.See nextscreen(Figure55). Figure54.Data Logging

44 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

www.ti.com ScreenShots Selectthestoragelocationforthefileand thetypeoffile.As shown (Figure55),thefilewillbe a CSV file tobe storedinthedirectorypathshown.Loggingbeginswhen theStartData Loggingbuttonisselected, and stopswhen itisreselected(asStopData Logging). Figure55.Data Logging Details Data isstoredina CSV file,withdate-stampname (Figure56). Figure56.Data Log Common contentsofthedatalog.As shown (Figure57),theUUT had been disabled,and bothrailswere off. 45SLVU638 –January2012 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SubmitDocumentationFeedback Copyright© 2012,Texas InstrumentsIncorporated

ScreenShots www.ti.com Figure57.Data Log File SelectingPMBus Logging(Figure58)fromtheToolsdrop-downmenu enablestheloggingofallPMBus activity.Thisincludescommunicationstrafficforeach pollingloopbetween theGUI and thedevice.Italso includescommon operatingvaluessuch as Vout,Iout,and Temperatureforbothoutputrails.The useris promptedtoselecta locationforthefiletobe stored.See nextscreen(Figure59). Figure58.PMBus Logging

46 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

www.ti.com ScreenShots Selectthestoragelocationforthefileand thetypeoffile.As shown (Figure59),thefileisa CSV filetobe storedinthedirectorypathshown.Loggingbeginswhen theStartLoggingbuttonisselected,and stops when itisreselected(asStopLogging).Thisfilecan rapidlygrow insize,so cautionisadvisedwhen usingthisfunction. Figure59.PMBus Log Details Data isstoredina CSV file,withdate-stampname (Figure60). Figure60.PMBus Log Common contentsofthePMBus log.As shown (Figure61),theUUT had been disabled,and bothrails were off. 47SLVU638 –January2012 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SubmitDocumentationFeedback Copyright© 2012,Texas InstrumentsIncorporated

ScreenShots www.ti.com Figure61.PMBus Log File

48 UsingthePWR091EVM Dual-OutputDC/DC AnalogWithPMBus Interface SLVU638 –January2012

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Product Information

CX35-36-CY specifications and overview.

Summary

Using the PWR091EVM Dual-Output DC/DC Analog With PMBus Interface

Description

Using the PWR091EVM Dual-Output DC/DC Analog With PMBus Interface

Source title CX35-36-CY Datasheet(PDF) - Texas Instruments

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