PTN04050AAD;PTN04050AAZ;PTN04050AAH;PTN04050AAS;PTN04050AAST;中文规格书,Datasheet资料

PTN04050Awww.ti.com

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6-W,3.3-V/5-VINPUT,WIDEADJUSTOUTPUT,POSITIVE-TO-NEGATIVECONVERTER

FEATURES

••••••••••

Upto6-WOutputPowerWide-InputVoltage(2.9Vto7V)

Wide-OutputVoltageAdjust(–15Vto–3.3V)

HighEfficiency(Upto84%)On/OffInhibit

OutputCurrentLimitUndervoltageLockout

OvertemperatureShutdown

OperatingTemperature:–40°Cto85°CSurface-MountPackageAvailable

APPLICATIONS

•

General-Purpose,IndustrialControls,HVACSystems,TestandMeasurement,MedicalInstrumentation,AC/DCAdaptors,Vehicles,Marine,andAvionics

DESCRIPTION

ThePTN04050Aisanadjustableoutput,positive-to-negative,integratedswitchingregulator.Innewdesigns,itshouldbeconsideredinplaceofthePT5020seriesofpositive-to-negativeintegratedswitchingregulatorproducts.ThePTN04050Aissmallerandlighterthanitspredecessor,withimprovedelectricalperformancecharacteristics,whileoperatingoverawiderinputvoltagerange,withanadjustableoutputvoltage.Thecaseless,double-sidedpackagealsoexhibitsimprovedthermalcharacteristics,andiscompatiblewithTI'sroadmapforRoHSandlead-freecompliance.

Operatingfromawide-inputvoltagerangeof2.9 V to7 V,thePTN04050Aprovideshigh-efficient,positive-to-negativevoltageconversionforloadsofupto6 W.Theoutputvoltageissetusingasingleexternalresistor,andmaybesettoanyvaluewithintherange,–15Vto–3.3 V.

ThePTN04050Afeaturesincludeon/offinhibit,undervoltagelockout,over-currentprotection,andissuitedforawidevarietyofgeneral-purposeapplicationsthatoperateoff3.3-Vor5-Vinput.

STANDARDAPPLICATION-VO1PTN04050A(Top󰀀View)5VIINH(1)234RSET1󰀀%,󰀀0.05󰀀W(Required)(2)+C3100mFElectrolytic(Required)(1)C1100mF+Electrolytic(Required)GNDGND(1)(2)

SeetheApplicationInformationforcapacitorrecommendations.

RSETisrequiredtoadjusttheoutputvoltage.SeetheApplicationInformationforvalues.

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.ProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.Productionprocessingdoesnotnecessarilyincludetestingofallparameters.

Copyright©2005,TexasInstrumentsIncorporated

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Thesedeviceshavelimitedbuilt-inESDprotection.TheleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoamduringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.

ORDERINGINFORMATION

Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdatasheet,orseetheTIwebsiteatwww.ti.com.

ABSOLUTEMAXIMUMRATINGS

(1)

overoperatingfree-airtemperaturerangeunlessotherwisenotedallvoltageswithrespecttoGND(pin1),

UNIT

TA

Operatingfree-airtemperatureLeadedtemperature(H&Dsuffix)Solderreflowtemperature(Ssuffix)Solderreflowtemperature(Zsuffix)

Tstg(1)(2)

Storagetemperature

OverVIrange20seconds

Surfacetemperatureofmodulebodyorpins(20sec)Surfacetemperatureofmodulebodyorpins(20sec)

–40°Cto85°C

260°C235°C260°C(2)–40°Cto125°C

Stressesbeyondthoselistedunderabsolutemaximumratingsmaycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderrecommendedoperatingconditionsisnotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.MoistureSensitivityLevel(MSL)ratingLevel-3-260C-168HR

RECOMMENDEDOPERATINGCONDITIONS

MIN

VITAPO

Inputvoltage

Operatingfree-airtemperatureOutputpower

2.9–40

MAX

7856

UNITV°CW

PACKAGESPECIFICATIONS

PTN04050A(SuffixAH,AD,ASandAZ)

WeightFlammabilityMechanicalshockMechanicalvibration(1)

Qualificationlimit.

MeetsUL94V-O

PerMil-STD-883D,Method2002.3,1ms,½sine,mounted

Mil-STD-883D,Method2007.2,20-2000Hz

HorizontalT/H(suffixAH&AD)HorizontalSMD(suffixAS&AZ)

500G20G15G

(1)(1)(1)

2.7grams

2

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SLTS250–SEPTEMBER2005

ELECTRICALCHARACTERISTICS

operatingat25°Cfree-airtemperature,VI=5V,VO=–12V,IO=IO(max),CI=100µF,CO=100µF(unlessotherwisenoted)

PARAMETER

TESTCONDITIONS

VO=–3.3Vto–6V

IO

Outputcurrent

TA=85°C,naturalconvectionairflow

VO=–9VVO=–12V

VO=–12.6Vto–15V

POVI

OutputpowerInputvoltagerangeSet-pointvoltagetoleranceTemperaturevariation

VO

LineregulationLoadregulation

Totaloutputvoltagevariation

VOAdj

Outputvoltageadjustrange

RSET=523Ω,VO=–15V,IO=0.3ARSET=1.96kΩ,VO=–12V,IO=0.5A

η

Efficiency

RSET=4.53kΩ,VO=–9V,IO=0.6ARSET=15.4kΩ,VO=–5V,IO=1.0ARSET=36.5kΩ,VO=–3.3V,IO=1.0A

VrIO(LIM)

OutputvoltagerippleCurrentlimitthresholdTransientresponse

FSUVLO

SwitchingfrequencyUndervoltagelockout

20-MHzbandwidth

Reset,followedbyauto-recovery

1A/µsloadstep

from50%to100%IOmax(4)

OverVIandIOrangesVIincreasingVIdecreasing

Inputhighvoltage(VIH)

Inhibitcontrol(pin3)

IIinhCICO

InhibitstandbycurrentExternalinputcapacitance

Ceramic

Externaloutputcapacitance

Nonceramic

Equivalentseriesresistance(nonceramic)

MTBF

Calculatedreliability

PerTelcordiaSR-332,50%stress,TA=40°C,groundbenign

10010

Inputlowvoltage(VIL)Inputlowcurrent(IIL)Inhibit(pin3)toGND(pin1)

100

(6)

MIN0.20.10.10.1

(1)(1)(1)(1)

TYPMAX1.00.60.5

(2)(2)(2)

UNIT

A

0.36

WV%%VO%VO%VO%VO

–3.3

80828382783%VO

150

V(PP)%IOmaxµs%VO

3102.55Open10470

(5)

OverIOrangeTA=25°C–40°Cto+85°COverVIrangeOverIOrange

Includessetpoint,line,load–402.9

±3

(3)

7

±0.50.50.25±5

(3)

–15V

%

RecoverytimeVOover/undershoot

2102.30VI–0.5–0.2

10022602.502.40

+0.25

kHzV

VµAµAµF

0

(8)(10)

100(7)560

(9)

µFµFmΩ106Hrs

7.5

(1)(2)(3)

Themodulewilloperatedowntonoloadwithreducedspecifications.

Themaximumoutputcurrentis1Aorthemaximumoutputpoweris6W,whicheverisless.

Theset-pointvoltagetoleranceisaffectedbythetoleranceandstabilityofRSET.ThestatedlimitisunconditionallymetifRSEThasatoleranceof1%with100ppm/°Corbettertemperaturestability.(4)Aloadstepfrom66%to100%IOmaxforVO=–15V.

(5)Thiscontrolpinhasaninternalpull-uptotheinputvoltage,VI.Ifitisleftopencircuit,themoduleoperateswheninputpowerisapplied.

Asmall,low-leakage(< 100 nA)metal-oxidesemiconductorfieldeffecttransistor(MOSFET)isrecommendedforcontrol.SeetheapplicationInformationforfurtherguidance.

(6)100µFofcapacitanceisrequiredacrosstheinput(VIandGND)forproperoperation.Locatetheceramiccapacitanceclosetothe

module.

(7)Whenusingceramicoutputcapacitanceequivalentto100µF,a100µFelectrolyticcapacitorisalsorequired.

(8)100µFofoutputcapacitanceisrequiredforproperoperation.Seetheapplicationinformationforfurtherguidance.

(9)TheminimumESRlimitationmayresultinalowervaluefortheoutputcapacitance.SeetheInput/OutputCapacitorRecommendations

forfurtherguidance.

(10)ThisisthetypicalESRforalltheelectrolytic(nonceramic)capacitance.Use17mΩastheminimumwhenusingmaximumESRvalues

tocalculate.

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PINASSIGNMENT

TERMINALFUNCTIONS

TERMINALNAMEGNDVI

NO.12

II/O

DESCRIPTION

ThecommongroundconnectionfortheVIandVOpowerconnections.ItisalsothereferencefortheVOAdjustcontrolinputs.

Thepositiveinputvoltagepowernodetothemodule,whichisreferencedtocommonGND.

TheInhibitpinisanopen-collector/drain(non-TTL),negativelogicinputthatisreferencedtoGND.

Applyingalow-levelgroundsignaltothisinputdisablesthemodule'soutput.WhentheInhibitcontrolisactive-low,theinputcurrentdrawnbytheregulatorissignificantlyreduced.IftheInhibitpinisleftopen-circuit,themoduleproducesanoutputvoltagewheneveravalidinputsourceisapplied.ThePTN04050AInhibitcontrolcircuitrymustnotbesharedwithanothermodule.NeverconnectaresistorbetweentheInhibitpinandanyothervoltagereferenceorGND.

A1%resistormustbeconnectedbetweenpin4andpin1tosettheoutputvoltageofthemodule.Ifleftopen-circuit,theoutputvoltagedefaultsto–1.79V,whichisbeyondtherecommendedoperatingrange.Theset-pointrangeis–15Vto–3.3V.Thetemperaturestabilityoftheresistorshouldbe100ppm/°C(orbetter).Thestandardresistorvalueforanumberofcommonoutputvoltagesisprovidedintheapplicationinformation.

ThenegativeoutputvoltagepowernodewithrespecttotheGNDnode.

1

PTN04050A(Top󰀀View)

45

Inhibit3I

VOAdjust

4I

VO

5O

23

4

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TYPICALCHARACTERISTICS(3.3-VINPUT)(1)(2)

EFFICIENCY

vs

OUTPUTCURRENT

VO-󰀀Output󰀀Voltage󰀀Ripple󰀀-󰀀mVPP9085

VO=󰀀-9󰀀VVO=󰀀-5󰀀VOUTPUTVOLTAGERIPPLE

vs

OUTPUTCURRENT

150130110907050301000.20.4VO=󰀀-5󰀀VVO=󰀀-9󰀀VVO=󰀀-12󰀀VVO=󰀀-15󰀀VPOWERDISSIPATION

vs

OUTPUTCURRENT

2

PD-󰀀Power󰀀Dissipation󰀀-󰀀W1.81.61.41.210.80.60.40.20

VO=󰀀-12󰀀VVO=󰀀-15󰀀VVO=󰀀-9󰀀VEfficiency󰀀-󰀀%8075

VO=󰀀-12󰀀V70

VO=󰀀-15󰀀VVO=󰀀-3.3󰀀VVO=󰀀-5󰀀VVO=󰀀-3.3󰀀V00.20.40.60.816560

VO=󰀀-3.3󰀀V00.20.40.60.810.60.81IO-󰀀Output󰀀Current󰀀-A

IO-󰀀Output󰀀Current󰀀-AIO-󰀀Output󰀀Current󰀀-A

Figure1.

TEMPERATUREDERATING

vs

OUTPUTCURRENT

90

90

Figure2.

TEMPERATUREDERATING

vs

OUTPUTCURRENT

90

Figure3.

TEMPERATUREDERATING

vs

OUTPUTCURRENT

Ambient󰀀Temperature󰀀-oC80

200󰀀LFMAmbient󰀀Temperature󰀀-oC80706050403020

0Ambient󰀀Temperature󰀀-oC200󰀀LFM100󰀀LFM60󰀀LFMNat󰀀conv807060504030

200󰀀LFM100󰀀LFM60󰀀LFMNat󰀀conv7060504030

100󰀀LFM60󰀀LFMNat󰀀convVO=󰀀-3.3󰀀VVO=󰀀-5󰀀VVO=󰀀-12󰀀V0.20.40.60.8120

00.20.40.60.8120

00.10.20.30.40.5

IO-󰀀Output󰀀Current󰀀-AIO-󰀀Output󰀀Current󰀀-AIO-󰀀Output󰀀Current󰀀-A

Figure4.Figure5.

TEMPERATUREDERATING

vs

OUTPUTCURRENT

90

Figure6.

Ambient󰀀Temperature󰀀-oC80706050403020

0

200󰀀LFM100󰀀LFM60󰀀LFMNat󰀀convVO=󰀀-15󰀀V0.050.10.150.20.250.3

IO-󰀀Output󰀀Current󰀀-A

Figure7.

(1)(2)

Theelectricalcharacteristicdatahasbeendevelopedfromactualproductstestedat25°C.Thisdataisconsideredtypicalfortheconverter.AppliestoFigure1,Figure2,andFigure3.Thetemperaturederatingcurvesrepresenttheconditionsatwhichinternalcomponentsareatorbelowthemanufacturer'smaximumoperatingtemperatures.Deratinglimitsapplytomodulessoldereddirectlytoa100mmx100mm,double-sidedPCBwith2oz.copper.AppliestoFigure4,Figure5,Figure6,andFigure7.SubmitDocumentationFeedback

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TYPICALCHARACTERISTICS(5-VINPUT)(1)(2)

EFFICIENCY

vs

OUTPUTCURRENT

9085

VO=󰀀-12󰀀VOUTPUTVOLTAGERIPPLE

vs

OUTPUTCURRENT

VO-󰀀Output󰀀Voltage󰀀Ripple󰀀-󰀀mVPP130

1.6

POWERDISSIPATION

vs

OUTPUTCURRENT

PD-󰀀Power󰀀Dissipation󰀀-󰀀W1.41.210.80.60.40.2000.20.4VO=󰀀-5󰀀VVO=󰀀-3.3󰀀V0.60.81IO-󰀀Output󰀀Current󰀀-A

VO=󰀀-12󰀀VVO=󰀀-9󰀀VVO=󰀀-12󰀀V1109070503010

VO=󰀀-9󰀀VVO=󰀀-15󰀀VVO=󰀀-15󰀀VVO=󰀀-9󰀀VEfficiency󰀀-󰀀%807570

VO=󰀀-15󰀀VVO=󰀀-5󰀀VVO=󰀀-3.3󰀀VVO=󰀀-5󰀀V6560

VO=󰀀-3.3󰀀V00.20.40.60.8100.20.40.60.81IO-󰀀Output󰀀Current󰀀-A

IO-󰀀Output󰀀Current󰀀-A

Figure8.

TEMPERATUREDERATING

vs

OUTPUTCURRENT

90

90

Figure9.

TEMPERATUREDERATING

vs

OUTPUTCURRENT

90

Figure10.

TEMPERATUREDERATING

vs

OUTPUTCURRENT

Ambient󰀀Temperature󰀀-oC807060504030

VO=󰀀-12󰀀VAmbient󰀀Temperature󰀀-oC80706050403020

0Ambient󰀀Temperature󰀀-oC200󰀀LFM60󰀀LFM100󰀀LFMNat󰀀conv807060504030

200󰀀LFM100󰀀LFM60󰀀LFMNat󰀀conv200󰀀LFM100󰀀LFM60󰀀LFMNat󰀀convVO=󰀀-3.3󰀀VVO=󰀀-5󰀀V0.20.40.60.8120

00.20.40.60.8120

00.10.20.30.40.5

IO-󰀀Output󰀀Current󰀀-AIO-󰀀Output󰀀Current󰀀-AIO-󰀀Output󰀀Current󰀀-A

Figure11.Figure12.

TEMPERATUREDERATING

vs

OUTPUTCURRENT

90

Figure13.

Ambient󰀀Temperature󰀀-oC80706050403020

0

200󰀀LFM100󰀀LFM60󰀀LFMNat󰀀convVO=󰀀-15󰀀V0.050.10.150.20.250.3

IO-󰀀Output󰀀Current󰀀-A

Figure14.

(1)(2)

Theelectricalcharacteristicdatahasbeendevelopedfromactualproductstestedat25°C.Thisdataisconsideredtypicalfortheconverter.AppliestoFigure8,Figure9,andFigure10.Thetemperaturederatingcurvesrepresenttheconditionsatwhichinternalcomponentsareatorbelowthemanufacturer'smaximumoperatingtemperatures.Deratinglimitsapplytomodulessoldereddirectlytoa100-mmx100-mm,double-sidedPCBwith2oz.copper.AppliestoFigure11,Figure12,Figure13,andFigure14.6

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APPLICATIONINFORMATION

AdjustingtheOutputVoltageofthePTN04050AWide-OutputAdjustPowerModules

General

AresistormustbeconnecteddirectlybetweentheVOAdjustcontrol(pin4)andGND(pin1)tosettheoutputvoltageofthemodule.Theadjustmentrangeisfrom–15Vto–3.3V.Ifpin4isleftopen,theoutputvoltagedefaultsto–1.79V,whichisbeyondtherecommendedoperatingrange.

Table1givesthestandardresistorvalueforanumberofcommonvoltages,alongwiththeactualoutputvoltagethatthevalueproduces.Forotheroutputvoltages,theresistorvaluecaneitherbecalculatedusingEquation1,orbyselectingfromtherangeofvaluesgiveninTable2.Figure15showstheplacementoftherequiredresistor.

RSET=󰀀󰀀-4.34󰀀kWx

VO+󰀀󰀀16.6󰀀VVO+󰀀󰀀1.734󰀀V

(1)

Table1.StandardValuesofRsetforCommonOutput

Voltages

VO

(Required)–15V–12V–5

(1)(2)

RSET

(StandardValue)

523Ω1.91kΩ15.4kΩ36.5kΩ

VO(Actual)–15.00V–12.02V–5.00V–3.31V

V(2)

–3.3V(2)

(1)(2)

ForVO=–12.6Vto–15Vthemaximumoutputcurrentislimitedto0.3A.

ForVO=–3.3Vto–12.6Vthemaximumoutputcurrentis1Aorthemaximumoutputpoweris6W,whicheverisless.

PTN04050AVIInhibit3GND1VOAdj4VI+C1GND25VORSET0.05󰀀W,󰀀1%+COGND(1)

A0.05-Wratedresistormaybeused.Thetoleranceshouldbe1%,withatemperaturestabilityof100ppm/°C(orbetter).Placetheresistorascloseaspossibletotheregulator.Connecttheresistordirectlybetweenpins4and1usingdedicatedPCBtraces.

NeverconnectcapacitorsfromVOAdjusttoeitherGNDorVO.AnycapacitanceaddedtotheVOAdjustpinaffectsthestabilityoftheregulator.

(2)

Figure15.VOAdjustResistorPlacement

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Table2.OutputVoltageSet-PointResistorValues

VORequired–15.0V–14.9V–14.8V–14.7V–14.6V–14.5V–14.4V–14.3V–14.2V–14.1V–14.0V–13.9V–13.8V–13.7V–13.6V–13.5V–13.4V–13.3V–13.2V–13.1V–13.0V–12.9V–12.8V–12.7V–12.6V–12.5V–12.4V–12.3V–12.2V–12.1V–12.0V

RSET523Ω562Ω604Ω634Ω681Ω715Ω750Ω787Ω845Ω887Ω931Ω953Ω1.00kΩ1.05kΩ1.10kΩ1.15kΩ1.18kΩ1.24kΩ1.30kΩ1.33kΩ1.40kΩ1.43kΩ1.50kΩ1.kΩ1.58kΩ1.65kΩ1.69kΩ1.78kΩ1.82kΩ1.87kΩ1.96kΩ

VORequired–11.9V–11.8V–11.7V–11.6V–11.5V–11.4V–11.3V–11.2V–11.1V–11.0V–10.9V–10.8V–10.7V–10.6V–10.5V–10.4V–10.3V–10.2V–10.1V–10.0V–9.9V–9.8V–9.7V–9.6V–9.5V–9.4V–9.3V–9.2V–9.1V–9.0V–8.9V

RSET2.00kΩ2.05kΩ2.15kΩ2.21kΩ2.26kΩ2.32kΩ2.37kΩ2.49kΩ2.55kΩ2.61kΩ2.67kΩ2.80kΩ2.87kΩ2.94kΩ3.01kΩ3.09kΩ3.16kΩ3.32kΩ3.40kΩ3.48kΩ3.57kΩ3.65kΩ3.74kΩ3.83kΩ3.92kΩ4.12kΩ4.22kΩ4.32kΩ4.42kΩ4.53kΩ4.kΩ

VORequired–8.8V–8.6V–8.4V–8.2V–8.0V–7.8V–7.6V–7.4V–7.2V–7.0V–6.8V–6.6V–6.4V–6.2V–6.0V–5.8V–5.6V–5.4V–5.2V–5.0V–4.8V–4.6V–4.4V–4.2V–4.0V–3.8V–3.6V–3.4V–3.3V

RSET4.75kΩ5.11kΩ5.36kΩ5.62kΩ5.90kΩ6.34kΩ6.65kΩ7.15kΩ7.50kΩ7.87kΩ8.45kΩ8.87kΩ9.53kΩ10.2kΩ10.7kΩ11.5kΩ12.4kΩ13.3kΩ14.3kΩ15.4kΩ16.5kΩ18.2kΩ19.6kΩ21.5kΩ24.3kΩ26.7kΩ30.1kΩ34.0kΩ37.4kΩ

8

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CAPACITORRECOMMENDATIONSFORTHEPTN04050ANEGATIVE-OUTPUTADJUSTPOWERMODULES

InputCapacitor

Theminimumrequirementfortheinputbusis100µFofcapacitance.Theminimumripplecurrentratingforanynonceramiccapacitancemustbeatleast250mArms.Theripplecurrentratingofelectrolyticcapacitorsisamajorconsiderationwhentheyareusedattheinput.Thisripplecurrentrequirementcanbereducedbyplacingceramiccapacitorsattheinput.

Iftantalumcapacitorsareusedattheinputbus,aminimumvoltageratingof2×(maximumdcvoltage+acripple)isstandardpracticetoensurereliability.Polymer-tantalumcapacitorsaremorereliableandareavailablewithamaximumratingoftypically20V.OutputCapacitor

Theminimumcapacitancerequiredtoensurestabilityisa100µF.Eitherceramicorelectrolytic-typecapacitorscanbeused.Theminimumripplecurrentratingforthenonceramiccapacitancemustbeatleast200mArms.Thestabilityofthemoduleandvoltagetolerancesiscompromisedifthecapacitorisnotplacedneartheoutputbuspins.Ahigh-quality,computer-gradeelectrolyticcapacitorshouldbeadequate.Whenusingceramiccapacitanceequivalentto100µF,a100µFelectrolyticisalsorequired.

Forapplicationswithloadtransients(suddenchangesinloadcurrent),theregulatorresponseimproveswithadditionalcapacitance.Additionalelectrolyticcapacitorsshouldbelocatedclosetotheloadcircuit.Thesecapacitorsprovidedecouplingoverthefrequencyrange,2kHzto150kHz.Aluminumelectrolyticcapacitorsaresuitableforambienttemperaturesabove0°C.Foroperationbelow0°C,tantalumorOs-Con-typecapacitorsarerecommended.Whenusingoneormorenonceramiccapacitors,thecalculatedequivalentESRshouldbenolowerthan10mΩ(17mΩusingthemanufacturer'smaximumESRforasinglecapacitor).AlistofrecommendedcapacitorsandvendorsareidentifiedinTable3.CeramicCapacitors

Above150kHz,theperformanceofaluminumelectrolyticcapacitorsbecomeslesseffective.Tofurtherreducethereflectedinputripplecurrent,ortheoutputtransientresponse,multilayerceramiccapacitorsmustbeadded.CeramiccapacitorshavelowESR,andtheirresonantfrequencyishigherthanthebandwidthoftheregulator.Whenplacedattheoutput,theircombinedESRisnotcriticalaslongasthetotalvalueofceramiccapacitancedoesnotexceed200µF.TantalumCapacitors

Tantalum-typecapacitorsmaybeusedatboththeinputandtheoutput,andarerecommendedforapplicationswheretheambientoperatingtemperaturecanbelessthan0°C.TheAVXTPS,Sprague593D/594/595,andKemetT495/T510/T520capacitorsseriesaresuggestedovermanyothertantalumtypesduetotheirratedsurge,powerdissipation,andripplecurrentcapability.Asacaution,manygeneral-purposetantalumcapacitorshaveconsiderablyhigherESR,reducedpowerdissipation,andlowerripplecurrentcapability.Thesecapacitorsarealsolessreliableastheyhavelowerpowerdissipationandsurgecurrentratings.TantalumcapacitorsthatdonothaveastatedESRorsurgecurrentratingarenotrecommendedforpowerapplications.WhenspecifyingOs-Conandpolymer-tantalumcapacitorsfortheoutput,theminimumESRlimitisencounteredwellbeforethemaximumcapacitancevalueisreached.CapacitorTable

Thecapacitortable,Table3,identifiesthecharacteristicsofcapacitorsfromvariousvendorswithacceptableESRandripplecurrent(rms)ratings.Therecommendednumberofcapacitorsrequiredatboththeinputandoutputbusesisidentifiedforeachcapacitortype.Thisisnotanextensivecapacitorlist.Capacitorsfromothervendorsareavailablewithcomparablespecifications.Thoselistedareforguidance.ThermsratingandESR(at100kHz)arecriticalparametersnecessarytoensurebothoptimumregulatorperformanceandlongcapacitorlife.

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DesigningforLoadTransients

Thetransientresponseofthedc/dcconverterhasbeencharacterizedusingaloadtransientwithadi/dtof1A/µs.Thetypicalvoltagedeviationforthisloadtransientisgiveninthedatasheetspecificationtableusingtherequiredvalueofoutputcapacitance.Asthedi/dtofatransientisincreased,theresponseofaconverter'sregulationcircuitultimatelydependsonitsoutputcapacitordecouplingnetwork.Thisisaninherentlimitationofanydc/dcconverteroncethespeedofthetransientexceedsitsbandwidthcapability.Ifthetargetapplicationspecifiesahigherdi/dtorlowervoltagedeviation,therequirementcanonlybemetwithadditionaloutputcapacitordecoupling.Inthesecases,specialattentionmustbepaidtothetype,value,andESRofthecapacitorsselected.

Ifthetransientperformancerequirementsexceedthosespecifiedinthedatasheet,theselectionofoutputcapacitorsbecomesmoreimportant.ReviewtheminimumESRinthecharacteristicdatasheetfordetailsonthecapacitancemaximum.

Table3.RecommendedInput/OutputCapacitors

CAPACITORCHARACTERISTICS

CAPACITORVENDOR/

COMPONENTSERIES

WORKINGVOLTAGE

(V)

252516252535501025201620

AVXTantalumTPS(SMD)

20

MurataX5RCeramicTDKX5RCeramicMurataX5RCeramicKemetX5RCeramicTDKX5RCeramicMurataX5RCeramicTDKX5RCeramicMurataX7RCeramicKemetX7RCeramic

6.36.3166.36.36.3162516

10010010047474747222222

0.2000.0020.0020.0020.0020.0020.0020.0020.0020.002

>817>1000>1000>1000>1000>1000>1000>1000>1000>1000

322532253225322532253225322532253225

VALUE(µF)180100150100100100100100100100100100

EQUIVALENTSERIESRESISTANCE(ESR)(Ω)

0.1170.300.0260.0200.2500.3000.3000.0550.1300.0240.0320.085

85°CMAXIMUMRIPPLECURRENT(Irms)(mA)

555034304320290450500200040525002013

PHYSICALSIZE(mm)8X118X10,210X7,710X12,56,3X11,58X1010X107,7X4,36,3X118X1210X57,3L X 4,3WX 4,1H

QUANTITYINPUTOUTPUTBUSBUS1111111111111112222555

1≤1≤1≤1≤1≤2≤2≤2≤2≤511111111

(1)

VENDOR

NUMBER

PanasonicFC(Radial)PanasonicFC(SMD)

UnitedChemi-ConPXA(SMD)PSLXZMVY(SMD)

NichiconUWG(SMD)F559(Tantalum)HD

SanyoOs-ConSVP(SMD)SP

EEUFC1E181EEVFC1E101P

PXA16VC151MJ80TP(VO≤13V)

25PS100MJ12LXZ25VB101M6X11LLMVY35VC101MH10TPUWG1H101MNR1GSF551A107MN(VO≤5V)UHD1E101MER20SVP100M16SP100M(VO≤14V)

TPSV107M020R0085(VO≤10V)

TPSE107M020R0200(VO≤10V)

GRM32ER60J107M(VO≤5.5V)C3225X5R0J107MT(VO≤5.5V)

GRM32ER61C476M(Vo≤13.5V)C1210C476K9PAC(VO≤5.5V)C3225X5R0J476MT(VO≤5.5V)

GRM422X5R476M6.3(VO≤5.5V)

C3225X5R1E2265KT/MT(VO≤14V)

GRM32ER61C226KC1210C226K3PAC(VO≤14V)

11

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

≤5≤5

(1)

(1)

Themaximumvoltageratingofthecapacitormustbeselectedforthedesiredset-pointvoltage(VO).Tooperateatahigheroutputvoltage,selectacapacitorwithahighervoltagerating.

10

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