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User's Guide SNVA285A –October2007–RevisedApril2013 AN-1713 LM5116-12 EvaluationBoard
1 Introduction
The LM5116-12 evaluationboardisdesignedtoprovidethedesignengineerwitha fullyfunctionalpower converterbased on EmulatedCurrentMode ControltoevaluatetheLM5116 controllerIC.The evaluation boardprovidesa 12V outputwitha 5A currentcapability.The operatinginputvoltagerangesfrom15V to 80V.The designoperatesat250kHz,a good compromise between conversionefficiencyand solution size.The printedcircuitboardconsistsof4 layers,2 ounce coppertopand bottom,1 ounce copper internallayerson FR4 materialwitha thicknessof0.06inches.Thisuser'sguidecontainstheevaluation boardschematic,Bill-of-Materials(BOM), and a quicksetupprocedure.Forcompletecircuitdesign information,see LM5116 Wide Range SynchronousBuck Controller(SNVS499 ). The performanceoftheevaluationboardis:
- InputRange: 15V to80V
- OutputVoltage:12V
- OutputCurrent:0 to5A
- FrequencyofOperation:250 kHz
- Board Size:2.55× 2.65× 0.7inches
- Load Regulation:1%
- LineRegulation:0.1%
- HiccupMode CurrentLimitProtection Figure1.Efficiencywith10 µH Gowanda Inductor Figure2.Efficiencywith10 µH Pulse Inductor Alltrademarksarethepropertyoftheirrespectiveowners. 1SNVA285A –October2007–RevisedApril2013 AN-1713 LM5116-12 EvaluationBoard SubmitDocumentationFeedback Copyright© 2007–2013,Texas InstrumentsIncorporated
Poweringand LoadingConsiderations www.ti.com
2 Powering and Loading Considerations
Read thisentiresectionpriortoattemptingtopower theevaluationboard.
2.1 Quick Setup Procedure
Step 1:Setthepower supplycurrentlimitto10A.Turnoffthepower supply.Connectthepower supplyto theVIN terminals. Step 2:Connecttheload,witha 5A capability,totheVOUT terminals.The positiveconnectiongoes toP3 and negativeconnectiontoP4. Step 3:The EN pinshouldbe leftopen fornormaloperation. Step 4:SetVIN to48V withno loadapplied.VOUT shouldbe inregulationwitha nominal12V output. Step 5:Slowlyincreasetheloadwhilemonitoringtheoutputvoltage,VOUT shouldremaininregulationwith a nominal12V outputas theloadisincreasedup to5 Amps. Step 6:Slowlysweep theinputvoltagefrom15V to80V,VOUT shouldremaininregulationwitha nominal 12V output. Step 7:TemporarilyshorttheEN pintoGND tochecktheshutdownfunction. Step 8:Increasetheloadbeyond thenormalrangetocheckcurrentlimiting.Hiccupmode currentlimitis used forprotection.The peak shortcircuitcurrentislimitedtoapproximately11A.Coolingiscriticalduring thisstep.
2.2 AirFlow
Prolongedoperationwithhighinputvoltageatfullpower willcause theMOSFETs tooverheat.A stand- alonefanwithatleast200 LFM shouldalwaysbe provided. Figure3.Temperature Rise at48VIN with Figure4.Temperature Rise at48VIN with 10 µH Gowanda Inductor 10 µH Pulse Inductor
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2.3 Powering Up
Usingtheenablepinprovidedwillallowpoweringup thesourcesupplywiththecurrentlevelsetlow.Itis suggestedthattheloadbe keptlowduringthefirstpower up.Setthecurrentlimitofthesourcesupplyto provideabout1.5timestheanticipatedwattageoftheload.As you remove theconnectionfromthe enablepintoground,immediatelycheckfor12 voltsattheoutput. A quickefficiencycheckisthebestway toconfirmthateverythingisoperatingproperly.Ifsomethingis amissyou can be reasonablysurethatitwillaffecttheefficiencyadversely.Few parameterscan be incorrectina switchingpower supplywithoutcreatinglossesand potentiallydamaging heat.
2.4 Over CurrentProtection
The evaluationboardisconfiguredwithhiccupmode over-currentprotection.Thishelpstolimitthe thermalstresswhileinan overloadedcondition.Ifa sustainedoverloadisexpectedbeforetheonsetof hiccupmode, ensurethatsufficientcooling(airflow)ismaintained.The peak shortcircuitcurrentislimited toapproximately11A. Forsustainedshortcircuitprotection,a countertripstheinternalfaulttimerwhen a currentlimitcondition existsformore than256 clockcycles.C7 setstheoff-timeofthecurrentlimitfaulttimer,whichmay be lengthenedby increasingthevalueofC7. D2 isused todischargeC7 intheeventofa fastdecay ofthe inputvoltage.Though notrecommended, thehiccupfaulttimermay be disabledby removingC7. Figure5.ShortCircuitat48VIN Figure6.ShortCircuitat80VIN Figure7.ShortCircuitRecovery intoResistiveLoad 3SNVA285A –October2007–RevisedApril2013 AN-1713 LM5116-12 EvaluationBoard SubmitDocumentationFeedback Copyright© 2007–2013,Texas InstrumentsIncorporated
Poweringand LoadingConsiderations www.ti.com
2.5 Synchronization
A SYNC pinhas been providedon theevaluationboard.Thispincan be used tosynchronizetheregulator toan externalclock.Forcompleteinformation,see LM5116 Wide Range SynchronousBuck Controller (SNVS499 ). Figure8.Synchronizationat48VIN
2.6 ActiveLoads
Figure9 shows a typicalstart-upcharacteristicintoa constantcurrentactiveload.Thistypeofloadcan exhibitan initialshortcircuit,whichissustainedwellbeyond thedurationofthefaulttimer.Increasingthe soft-starttimeimprovestheabilitytostartintothistypeofload.Fortheextremecase,thehiccupfault timermay be disabledby removingC7. A sustainedshortcircuitshouldbe avoidedwhen thefaulttimeris notused. Figure9.Start-upintoActiveLoad at48VIN
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www.ti.com TypicalPerformanceWaveforms
3 TypicalPerformance Waveforms
Figure10.Synchronous Operationat48VIN withJMP1 Figure11.DiscontinuousOperationusing Diode Removed EmulationMode at48VIN withJMP1 Installed Figure12.TransientResponse at48VIN Figure13.Start-upintoResistiveLoad at48VIN Figure14.Shut Down at48VIN 5SNVA285A –October2007–RevisedApril2013 AN-1713 LM5116-12 EvaluationBoard SubmitDocumentationFeedback Copyright© 2007–2013,Texas InstrumentsIncorporated
BillofMaterials www.ti.com
4 BillofMaterials
ID PartNumber Type Size Parameters Qty Vendor C1, C2, C2012X7R1E105K Capacitor,Ceramic 0805 1 µF,25V,X7R, 10% 3 TDK C14 C3 C1608X7R1H104K Capacitor,Ceramic 0603 0.1µF,50V,X7R, 10% 1 TDK C4 VJ0603A331JXAA Capacitor,Ceramic 0603 330 pF,50V,COG, 5% 1 Vishay C5 VJ0603A150KXAA Capacitor,Ceramic 0603 15 pF,50V,COG, 10% 1 Vishay C6 VJ0603Y152KXXA Capacitor,Ceramic 0603 1500 pF,25V,X7R, 10% 1 Vishay C7 C1608X7R1C105K Capacitor,Ceramic 0603 1 µF,16V,X7R, 10% 1 TDK C8, C9, C4532X7R2A225M Capacitor,Ceramic 1812 2.2µF,100V X7R, 20% 4 TDK C10, C11 C12 C3225X7R2A105M Capacitor,Ceramic 1210 1 µF,100V X7R, 20% 1 TDK C13 C2012X7R2A104K Capacitor,Ceramic 0805 0.1µF,100V X7R, 10% 1 TDK C15 VJ0603A101KXAA Capacitor,Ceramic 0603 100 pF,50V,COG, 10% 1 Vishay C16, C17, T520D476M016ATE03 Capacitor,Polymer D Case 47 µF,16V,35m Ω 4 KEMET C18, C19 5 C20 C4532X7R1C226M Capacitor,Ceramic 1812 22 µF,16V,X7R, 20% 1 TDK C21 Capacitor,Ceramic 1812 Not Used 0 C22 EEV-FK2A470Q Capacitor,Electrolytic SMD 47 µF,100V,Case Size: 1 Panasonic 12.5mm X 13.5mm C23 Capacitor,Ceramic 0805 Not Used 0 D1, D2 CMPD2003 Diode,Switching SOT-23 200 mA, 200V 2 CentralSemi JMP1 Connector,Jumper 2 pinsq.post 1 L1 121KM1002H Inductor 10 µH, 8.72A,10 m Ω 1 Gowanda L1A PA2050.103NL Inductor 10 µH, 14.7A,5.8m Ω 0 Pulse P1-P4 1514-2 TurretTerminal .090”dia. 4 Keystone TP1-TP7 5012 TestPoint .040”dia. 7 Keystone Q1, Q2 Si7852DP N-CH MOSFET SO-8 Power 12.5A,80V,22 m Ω 2 Vishay PAK Siliconix R1 CRCW06031023F Resistor 0603 102 kΩ,1% 1 Vishay R2 CRCW06039311F Resistor 0603 9.31kΩ,1% 1 Vishay R3 CRCW06031072F Resistor 0603 10.7kΩ,1% 1 Vishay R4 CRCW06031211F Resistor 0603 1.21kΩ,1% 1 Vishay R5 Resistor 0603 Not Used 0 R6, R7 CRCW06030R0J Resistor 0603 0Ω 2 Vishay R8 CRCW0603103J Resistor 0603 10 kΩ,5% 1 Vishay R9 CRCW06031242F Resistor 0603 12.4kΩ,1% 1 Vishay R10 CRCW0603393J Resistor 0603 39 kΩ,5% 1 Vishay R11 LRC-LRF2010-01- Resistor 2010 0.010Ω,1% 0 IRC R010-F R11 WSL2010R0100FEA Resistor 2010 0.010Ω,1% 1 Vishay R12 CRCW06031R0J Resistor 0603 1Ω,5% 1 Vishay R13 CRCW0603105J Resistor 0603 1 M Ω,5% 1 Vishay R14 Resistor 1206 Not Used 0 R15 CRCW06037503F Resistor 0603 750 kΩ,1% 1 Vishay R16 CRCW06032R2J Resistor 0603 2.2Ω,5% 1 Vishay U1 LM5116 SynchronousBuck HTSSOP-20 1 Texas Controller Instruments
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5 PCB Layout
7SNVA285A –October2007–RevisedApril2013 AN-1713 LM5116-12 EvaluationBoard SubmitDocumentationFeedback Copyright© 2007–2013,Texas InstrumentsIncorporated
PCB Layout www.ti.com
8 AN-1713 LM5116-12 EvaluationBoard SNVA285A –October2007–RevisedApril2013
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www.ti.com PCB Layout 9SNVA285A –October2007–RevisedApril2013 AN-1713 LM5116-12 EvaluationBoard SubmitDocumentationFeedback Copyright© 2007–2013,Texas InstrumentsIncorporated
PCB Layout www.ti.com
10 AN-1713 LM5116-12 EvaluationBoard SNVA285A –October2007–RevisedApril2013
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www.ti.com EvaluationBoard Schematic
6 EvaluationBoard Schematic
Figure15.EvaluationBoard Schematic 11SNVA285A –October2007–RevisedApril2013 AN-1713 LM5116-12 EvaluationBoard SubmitDocumentationFeedback Copyright© 2007–2013,Texas InstrumentsIncorporated
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