POSITIVEwww.567.com

OPA567OPA567Rail-to-RailI/O,2APOWERAMPLIFIERDESCRIPTIONTheOPA567isalow-cost,high-current,operationalamplifierdesignedfordrivingawidevarietyofloadswhileoperatingonlow-voltagesupplies.
Itoperatesfromeithersingleordualsuppliesfordesignflexibilityandhasrail-to-railswingontheinputandoutput.
Outputswingiswithin300mVofthesupplyrails,withoutputcurrentof2A.
Smallerloadsallowanoutputswingclosertotherails.
TheOPA567isunitygainstable,easytouse,andfreefromthephaseinversionproblemsfoundinsomepoweramplifi-ers.
Highperformanceismaintainedatvoltageswingsneartheoutputrails.
TheOPA567providesanaccurateuser-selectedcurrentlimitsetwithanexternalresistor,ordigitallyadjustedviaaDigital-to-AnalogConverter(DAC).
TheoutputoftheOPA567canbeindependentlydisabledusingtheEnablepin.
Thisfeaturesavespowerandprotectstheload.
Twoflagsareprovided.
Thecurrentlimitflag,IFLAG,warnsofcurrentlimitconditions.
TFLAGisathermalflagthatwarnsofthermaloverstress.
TheTFLAGpincanbeconnectedtotheEnablepintoprovideathermalshutdownsolution.
TheOPA567isavailableinatiny5mmx5mmQuadFlatpackNo-lead(QFN)packageandfeaturesanexposedthermalpadthatenhancesthermalandelectricalcharacter-istics.
Itissmallandeasytoheatsink.
TheOPA567isspecifiedforoperationovertheindustrialtemperaturerange,–40°Cto+85°C.
FEATURESqHIGHOUTPUTCURRENT:2AqOUTPUTSWINGSTO:150mVofRailswithIO=2AqTHERMALPROTECTIONqADJUSTABLECURRENTLIMITqTWOFLAGS:CurrentLimitandTemperatureWarningqLOWSUPPLYVOLTAGEOPERATION:2.
7Vto5.
5VqSHUTDOWNFUNCTIONWITHOUTPUTDISABLEqSMALLPOWERPACKAGEAPPLICATIONSqTHERMOELECTRICCOOLERDRIVERqLASERDIODEPUMPDRIVERqVALVE,ACTUATORDRIVERqSYNCHRO,SERVODRIVERqTRANSDUCEREXCITATIONqGENERALLINEARPOWERBOOSTERFOROPAMPSwww.
ti.
comCopyright2005,TexasInstrumentsIncorporatedSBOS287A–JUNE2005–REVISEDSEPTEMBER2005OPA567TFLAGV–VONOTE:(1)Connectforthermalprotection.
–IN+INV+81,124,5101172,369RSET(1)EnableISETIFLAGPleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
PowerPADisatrademarkofTexasInstruments.
Allothertrademarksarethepropertyoftheirrespectiveowners.
OPA567RELATEDPRODUCTSFEATURESPRODUCTSamefeaturesastheOPA567,pluscurrentOPA569monitoroutputandparallelingabilityinSO-20PowerPADpackage.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
ProductsconformtospecificationsperthetermsofTexasInstrumentsstandardwarranty.
Productionprocessingdoesnotnecessarilyincludetestingofallparameters.
OPA567SBOS287A2www.
ti.
comPIN#NAMEDESCRIPTION1,12V+PositivePower-SupplyVoltage2,3VOOutput4,5V–NegativePower-SupplyVoltage6ISETCurrentLimitSetPin(1)7IFLAGCurrentLimitFlag—Indicateswhenpartisincurrentlimit(activeLOW).
8–INInvertingInput9+INNoninvertingInput10TFLAGThermalFlag—Indicatesthermalstress(activeLOW).
11ENABLEEnabledHIGH,shutdownLOW.
ELECTROSTATICDISCHARGESENSITIVITYThisintegratedcircuitcanbedamagedbyESD.
TexasInstrumentsrecommendsthatallintegratedcircuitsbehandledwithappropriateprecautions.
Failuretoobserveproperhan-dlingandinstallationprocedurescancausedamage.
ESDdamagecanrangefromsubtleperformancedegrada-tiontocompletedevicefailure.
Precisionintegratedcircuitsmaybemoresusceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.
SupplyVoltage7.
5VOutputCurrentSeeSOACurvesSignalInputTerminals(pins8and9):Voltage(2)V–)–0.
5Vto(V+)+0.
5VCurrent(2)10mAOutputShort-Circuit(3)ContinuouswhenthermalprotectionenabledEnablePin(pin11)V–)–0.
5Vto(V–)+7.
5VCurrentLimitSet,ILIMITPin(pin6)V–)–0.
5Vto(V+)+0.
5VOperatingTemperature55°Cto+125°CStorageTemperature65°Cto+150°CJunctionTemperature150°CESDRating:HumanBodyModel3kVChargedDeviceModel1500VNOTES:(1)Stressesabovetheseratingsmaycausepermanentdamage.
Exposuretoabsolutemaximumconditionsforextendedperiodsmayde-gradedevicereliability.
Thesearestressratingsonly,andfunctionalopera-tionofthedeviceattheseoranyotherconditionsbeyondthosespecifiedisnotimplied.
(2)Inputterminalsarediode-clampedtothepower-supplyrails.
Inputsignalsthatcanswingmorethan0.
5Vbeyondthesupplyrailsshouldbecurrentlimitedto10mAorless.
(3)Short-circuittoground.
PINCONFIGURATIONABSOLUTEMAXIMUMRATINGS(1)V+VOVO+IN–INIFLAG123987Metalheatsink(locatedonbottom)V+EnableTFLAG121110V–V–ISET456TopViewQFNPINDESCRIPTIONSNOTE:(1)Thispinlimitstheoutputcurrent.
Thelimitedvalue,ILIMIT,is9800(ISET),whereISETisthecurrentflowingthroughtheISETpin.
ThiscurrentisprogrammedbytheresistorRSETconnectedtoV–.
PACKAGE/ORDERINGINFORMATIONForthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumlocatedattheendofthisdatasheet.
OPA567SBOS287A3www.
ti.
comELECTRICALCHARACTERISTICS:VS=+2.
7Vto+5.
5VBoldfacelimitsapplyoverthespecifiedtemperaturerange,TA=–40°Cto+85°C.
AtTCASE=+25°C,RL=1k,andconnectedtoVS/2,unlessotherwisenoted.
NOTES:(1)Seetypicalcharacteristic,MaximumOutputVoltagevsFrequency.
(2)Seetypicalcharacteristic,TotalHarmonicDistortion+NoisevsFrequency.
(3)Swingtotherailismeasuredinfinaltest.
Underthoseconditions,theAOLisderivedfromcharacterization.
(4)SeeSafeOperatingArea(SOA)plots.
(5)Seetypicalcharacteristic,OvershootvsLoadCapacitance.
(6)SeetheTypicalCharacteristicssection.
Higherfrequencyoutputimpedancecanaffectfrequencystability.
(7)Externalcurrentlimitsettingresistorisrequired;seeFigure1.
(8)ILIMITisthevalueofthedesiredcurrentlimitandisequalto9800(ISET),whereISETisthecurrentthroughtheISETpin.
ILIMITtoleranceisproportionaltotheratioofILIMIT/ISET.
Errorsfromthisparametercanbecalibratedout—seetheApplicationsInformationsection.
(9)VSETisavoltagereferencethatequalsthedifferencebetweenthevoltageoftheISETpinandV–,andisreferencedtothenegativerail.
Errorsfromthisparametercanbecalibratedout—seetheApplicationsInformationsection.
OPA567PARAMETERCONDITIONMINTYPMAXUNITSOFFSETVOLTAGEInputOffsetVoltageVOSIO=0V,VS=+5V±0.
5±2mVvsTemperaturedVOS/dTTA=–40°Cto+85°C±1.
3V/°CvsPowerSupplyPSRRVS=+2.
7Vto+5.
5V,VCM=(V–)+0.
55V1260V/VINPUTBIASCURRENTInputBiasCurrentIB±1±10pAvsTemperature(doublesevery10°C)InputOffsetCurrentIOS±2±10pANOISEInputVoltageNoiseDensity,f=1kHzen12nV/√Hzf=0.
1Hzto10Hz8VPPCurrentNoiseDensity,f=1kHzin0.
6fA/√HzINPUTVOLTAGERANGECommon-ModeVoltageRangeVCMLinearOperation(V–)–0.
1(V+)+0.
1VCommon-ModeRejectionRatioCMRRVS=+5V,–0.
1V100dB(V–)+0.
2(VS)±0.
02(V+)–0.
2VIO=±2A,VS=+5V,AOL>80dB(3)(V–)+0.
3(VS)±0.
2(V+)–0.
3VMaximumContinuousCurrentOutput:dc(4)2.
4ACapacitiveLoadDrive(5)CLOADSeeTypicalCharacteristicsClosed-LoopOutputImpedance(6)ROG=1,dc0.
1G=1,f=10kHz0.
44G=1,f=1.
2MHz45OutputDisabledOutputImpedance12M||570||pFCURRENTLIMIT(ISETPin)OutputCurrentLimit(7)ExternallyAdjustable±0.
2to±2.
2ACurrentLimitEquation(8)ILIMIT=ISET9800ARSETEquationRSET=9800(1.
18V/ILIMIT)CurrentLimitTolerance(8),PositiveILIMIT=1A±3±10%NegativeILIMIT=1A±3±15%VSETTolerance(9)(V–)+1.
05(V–)+1.
18(V–)+1.
3VENABLE/SHUTDOWNINPUTEnablePinBiasCurrentVSD=0V0.
2AHIGH(Outputenabled)VSDPinOpenorForcedHIGH(V–)+2.
5VLOW(Outputdisabled)VSDPinForcedLOW(V–)+0.
8VOutputDisableTimeRL=10.
5sOutputEnableTimeRL=115sOPA567SBOS287A4www.
ti.
comTHERMALFLAGPIN(TFLAG)JunctionTemperature:TJAlarm(thermalstatuspinLow)Thermaloverstress+147°CReturntonormaloperation(ThermalFlagpinHigh)Normaloperation+130°CThermalFlagPinVoltageDuringnormaloperationTFLAGpinsourcing25A(V+)–0.
8VV+VDuringthermaloverstressTFLAGpinsinking25AV–(V–)+0.
8VCURRENTLIMITFLAGPIN(IFLAG)CurrentLimitFlagPinVoltageDuringnormaloperationIFLAGpinsourcing25A(V+)–0.
8VV+VDuringcurrentlimitIFLAGpinsinking25AV–(V–)+0.
8VPOWERSUPPLYSpecifiedVoltageRangeVS+2.
7+5.
5VOperatingVoltageRange+2.
5+5.
5VQuiescentCurrent(10)IQIO=0,ILIMIT=200mA,VS=5V+3.
4+6mAIO=0,ILIMIT=2A,VS=5V+9+11mAQuiescentCurrentinShutdownModeIO=0,VSD=0.
8V,VS=5V+0.
01mATEMPERATURERANGESpecifiedRangeJunctionTemperature–40+85°COperatingRangeJunctionTemperature–55+125°CStorageRange–65+150°CThermalResistance:Junction-to-CaseθJC6°C/WJunction-to-AmbientθJA38°C/WELECTRICALCHARACTERISTICS:VS=+2.
7Vto+5.
5V(Cont.
)Boldfacelimitsapplyoverthespecifiedtemperaturerange,TA=–40°Cto+85°C.
AtTCASE=+25°C,RL=1k,andconnectedtoVS/2,unlessotherwisenoted.
OPA567PARAMETERCONDITIONMINTYPMAXUNITSNOTES:(10)Quiescentcurrentisafunctionofthecurrentlimitsetting.
SeeAdjustableCurrentLimitandCurrentLimitFlagPinintheApplicationsInformationsection.
OPA567SBOS287A5www.
ti.
comTYPICALCHARACTERISTICSAtTA=+25°C,VS=+5V,unlessotherwisenoted.
180160140120100806040200–20OPEN-LOOPGAINANDPHASEvsFREQUENCYFrequency(Hz)1101001k10k100k10M1M0.
10–20–40–60–80–100–120–140–160–180–200Phase(°)AOL(dB)120100806040200POWER-SUPPLYANDCOMMON-MODEREJECTIONRATIOvsFREQUENCYFrequency(Hz)PSRRandCMRR(dB)1101001k10k100kCMRRPSRR300250200150100500OUTPUTSWINGTOPOSITIVERAILvsSUPPLYVOLTAGESupplyVoltage(V)SwingtoRail(mV)2.
73.
03.
54.
04.
55.
05.
5IOUT=200mAIOUT=2AIOUT=1A300250200150100500OUTPUTSWINGTONEGATIVERAILvsSUPPLYVOLTAGESupplyVoltage(V)SwingtoRail(mV)2.
73.
03.
54.
04.
55.
05.
5IOUT=–200mAIOUT=–2AIOUT=–1A300250200150100500OUTPUTSWINGTOPOSITIVERAILvsTEMPERATURETemperature(°C)SwingtoRail(mV)–55–35–15525456585IO=2AVS=2.
7V,IO=200mAIO=1AVS=5V,IO=200mA300250200150100500OUTPUTSWINGTONEGATIVERAILvsTEMPERATURETemperature(°C)SwingtoRail(mV)–55–35–15525456585IO=2AVS=5V,IO=200mAIO=1AVS=2.
7V,IO=200mAOPA567SBOS287A6www.
ti.
comTYPICALCHARACTERISTICS(Cont.
)AtTA=+25°C,VS=+5V,unlessotherwisenoted.
1000100101INPUTVOLTAGENOISESPECTRALDENSITYvsFREQUENCYFrequency(Hz)InputVoltageNoise(nV√Hz)101001k10k100k0.
1HzTO10HzINPUTVOLTAGENOISE1V/div1s/div6543210MAXIMUMOUTPUTVOLTAGEvsFREQUENCYFrequency(Hz)OutputVoltage(VPP)1001k100k10k1MVS=5VRL=1kRL=1RL=1kVS=2.
7VRL=11010.
10.
010.
001TOTALHARMONICDISTORTION+NOISEvsFREQUENCYFrequency(Hz)THD+N(%)201001k10k20kRL=2RL=8RL=1k1086420QUIESCENTCURRENTvsSUPPLYVOLTAGESupplyVoltage(V)QuiescentCurrent(mA)2.
73.
03.
54.
04.
55.
05.
5CurrentLimit=1ACurrentLimit=2ACurrentLimit=200mA1086420QUIESCENTCURRENTvsTEMPERATURETemperature(°C)QuiescentCurrent(mA)–55–355–1525456510585125IQ(ILIMIT=2A)IQ(ILIMIT=200mA)OPA567SBOS287A7www.
ti.
comTYPICALCHARACTERISTICS(Cont.
)AtTA=+25°C,VS=+5V,unlessotherwisenoted.
121086420SHUTDOWNCURRENTvsSUPPLYVOLTAGESupplyVoltage(V)ShutdownCurrent(A)2.
73.
03.
54.
04.
55.
05.
5ILIMIT=200mA,1A,and2ASHUTDOWNCURRENTvsTEMPERATURETemperature(°C)ShutdownCurrent(A)121086420–55–355–15254565105851251086420QUIESCENTCURRENTvsCURRENTLIMITSETTINGCurrentLimitSetting(A)QuiescentCurrent(mA)00.
51.
01.
52.
02.
51000010001001010.
10.
01INPUTBIASCURRENTvsTEMPERATURETemperature(°C)InputBiasCurrent(pA)–55–35–155254565851051252.
01.
81.
61.
41.
21.
00.
80.
60.
40.
20SLEWRATEvsLOADRESISTANCELoadResistance()SlewRate(V/s)110SR–SR+10010002.
01.
81.
61.
41.
21.
00.
80.
60.
40.
20SLEWRATEvsTEMPERATURETemperature(°C)SlewRate(V/s)–5552545–35–156585105125SR–SR+OPA567SBOS287A8www.
ti.
comTYPICALCHARACTERISTICS(Cont.
)AtTA=+25°C,VS=+5V,unlessotherwisenoted.
1.
201.
191.
181.
171.
16VOLTAGEONISETPINvsTEMPERATURETemperature(°C)[VSET–(V–)](V)–55–35–155658510525451251.
251.
201.
151.
101.
05VOLTAGEONISETPINvsSUPPLYVOLTAGESupplyVoltage(V)[VSET–(V–)]2.
73.
03.
54.
04.
55.
05.
5CurrentLimit=1ACurrentLimit=2ACurrentLimit=200mAOFFSETVOLTAGEPRODUCTIONDISTRIBUTIONVOS(mV)–2.
0–1.
8–1.
6–1.
4–1.
2–1.
0Population–0.
8–0.
6–0.
4–0.
200.
20.
40.
60.
81.
01.
21.
41.
61.
82.
0OFFSETVOLTAGEDRIFTPRODUCTIONDISTRIBUTIONPopulationDrift(V/°C)–10–9–8–7–6–5–4–3–2–1012345678910TypicalProductionDistributionofPackagedUnits.
SMALL-SIGNALSTEPRESPONSE(G=+1,RL=1k)50mV/div10s/divLARGE-SIGNALSTEPRESPONSE(G=+1,RL=1k)1V/div20s/divOPA567SBOS287A9www.
ti.
comTYPICALCHARACTERISTICS(Cont.
)AtTA=+25°C,VS=+5V,unlessotherwisenoted.
SMALL-SIGNALSTEPRESPONSE(G=+1,RL=10)50mV/div10s/divLARGE-SIGNALSTEPRESPONSE(G=+1,RL=10)1V/div20s/divSMALL-SIGNALSTEPRESPONSE(G=+1,RL=1)50mV/div20s/divLARGE-SIGNALSTEPRESPONSE(G=+1,RL=1)1V/div20s/divENABLE(10Load)2V/div1V/div4s/divEnable/Disable0.
8to2.
5VAboveNegativeSupplyOutputDrivento+2VENABLE(1Load)10s/divEnable/Disable0.
8to2.
5VAboveNegativeSupplyOutputDrivento+2V1V/div2V/divOPA567SBOS287A10www.
ti.
comTYPICALCHARACTERISTICS(Cont.
)AtTA=+25°C,VS=+5V,unlessotherwisenoted.
DISABLE(10Load)200ns/divEnable/Disable0.
8to2.
5VAboveNegativeSupplyOutputDrivento+2V2V/div1V/divDISABLE(1Load)200ns/divEnable/Disable0.
8to2.
5VAboveNegativeSupplyOutputDrivento+2V2V/div1V/divPOWERON(1Load)1ms/divOutputDrivento+2VSupply0Vto5V5V/div1V/divPOWEROFF(1Load)1ms/div1V/div5V/divOutputDrivento+2VSupply5Vto0VINANDOUTOFCURRENTLIMITTRANSIENT(RL=0.
75,CurrentLimit=2A)VOUT(2V/div)CurrentLimitFlag(5V/div)200s/divINANDOUTOFCURRENTLIMITTRANSIENT(RL=7.
5,CurrentLimit=200mA)VOUT(2V/div)CurrentLimitFlag(5V/div)200s/divOPA567SBOS287A11www.
ti.
comTYPICALCHARACTERISTICS(Cont.
)AtTA=+25°C,VS=+5V,unlessotherwisenoted.
OVERLOADRECOVERY(G=+1)1V/div40s/divVINVOUTNOPHASEINVERSIONWITHINPUTSLARGERTHANSUPPLYVOLTAGE(G=+1,RL=10)1V/div1ms/divVINVOUT151050–5–10–15CURRENTLIMITERRORvsTEMPERATURETemperature(°C)CurrentLimitError(%)–55–35ILIMIT+ILIMIT––15525456585151050–5–10–15CURRENTLIMITERRORvsOUTPUTCURRENTOutputCurrent(A)CurrentLimitError(%)0.
20.
40.
60.
81.
01.
21.
41.
61.
82.
0ILIMIT+ILIMIT–50403020100OVERSHOOTvsLOADCAPACITANCE(G=+1,RL=1k)LoadCapacitance(pF)Overshoot(%)101001k10k151050–5–10–15CURRENTLIMITERRORvsSUPPLYVOLTAGESupplyVoltage(V)CurrentLimitError(%)ILIMIT+ILIMIT–2.
73.
03.
54.
04.
55.
05.
5OPA567SBOS287A12www.
ti.
comTYPICALCHARACTERISTICS(Cont.
)AtTA=+25°C,VS=+5V,unlessotherwisenoted.
CLOSED-LOOPOUTPUTIMPEDANCEvsFREQUENCYFrequency(Hz)100k1M2M10kOutputImpedance()1001010.
1G=1OPA567SBOS287A13www.
ti.
comAPPLICATIONSINFORMATIONBASICCONFIGURATIONFigure1showstheOPA567connectedasabasicnon-invertingamplifier.
However,theOPA567canbeusedinvirtuallyanyopampconfiguration.
Acurrentlimitsettingresistor(RSET,inFigure1)isessentialtotheOPA567operation,andcannotbeomitted.
Power-supplyterminalsshouldbebypassedwithlowseriesimpedancecapacitors.
Usinglargertantalumandsmallerceramictypecapacitorsinparallelisrecommended.
Power-supplywiringshouldhavelowseriesimpedance.
POWERSUPPLIESTheOPA567operateswithexcellentperformancefromasingle(+2.
7Vto+5.
5V)supplyorfromdualsupplies.
Powersupplyvoltagesdonotneedtobeequalaslongasthetotalvoltageremainsbelow5.
5V.
Parametersthatvarysignifi-cantlywithoperatingvoltageareshownintheTypicalCharacteristicssection.
ADJUSTABLECURRENTLIMITANDCURRENTLIMITFLAGPINTheOPA567providesover-currentprotectiontotheloadthroughitsaccurate,user-adjustablecurrentlimit(pin6).
Thecurrentlimitvalue,ILIMIT,canbesetfrom0.
2Ato2.
2AbycontrollingthecurrenttotheISETpin.
Thecurrentlimit,ILIMIT,willbe9800ISET,whereISETisthecurrentthroughtheISETpin.
Settingthecurrentlimitrequiresnospecialpowerresistors.
Theoutputcurrentdoesnotflowthroughthispin.
SettingthecurrentlimitAsillustratedinFigure2,thesimplestmethodofsettingthecurrentlimitistoconnectaresistororpotentiometerbetweenFIGURE1.
BasicConnections.
FIGURE2.
SettingtheCurrentLimit—ResistorMethod.
theISETpinandV–,thenegativesupply,accordingtotheformula:ILIMIT=9800(1.
18V/RSET)Alternatively,theoutputcurrentlimitcanbesetbyapplyingavoltagesourceinserieswitharesistanceusingtheequa-tion:ILIMIT=9800[(1.
18V–VADJUST)/RSET]ThevoltagesourcemustbereferencedtoV–.
VINR1R247FEnable(2)47F0.
1FISET47F1,122,3891164,50.
1FRSET()ILIMIT(A)23.
2k11.
5k7.
68k5.
76k0.
51.
01.
52.
0RSET(1)V+NOTES:(1)RSETsetsthecurrentlimitvaluefrom0.
2Ato2.
2A.
RSETcanbeapotentiometertoeasilyadjustcurrentlimitandcalibrateouterrorsatthecurrentlimitnode.
(2)Enable—pullLowtodisableoutput.
VOV–OPA567RSETVADJUST(1)(b)Resistor/VoltageSourceMethodNOTE:(1)ThisvoltagesourcemustbeabletosinkthecurrentfromtheISETpin,whichisILIMIT/9800.
1.
18VV–ILIMIT=9800(1.
18V–VADJUST)RSETISETISET8962,32,34,58964,5RPOT(a)ResistororPotentiometerMethodPuttingasetresistorinserieswiththepotentiometerwillpreventpotentialshort-circuitonpin.
1.
18VV–ILIMIT=9800(1.
18V/RSET)OPA567SBOS287A14www.
ti.
comCurrentLimitAccuracyInternallyseparatecircuitsmonitorthepositiveandnegativecurrentlimits.
Eachcircuitoutputiscomparedtoasingleinternalreferencethatissetbytheuserwithanexternalresistororaresistor/voltagesourcecombination.
TheOPA567employsapatentedcircuittechniquetoachieveanaccurateandstablecurrentlimitthroughoutthefulloutputrange.
Theinitialaccuracyofthecurrentlimitistypicallywithin3%;however,becauseofinternalmatchinglimitations,theerrorcanbeasmuchas15%.
Thevariationofthecurrentlimitwithfactorssuchasoutputcurrentlevel,outputvoltage,andtemperatureisshownintheTypicalCharacteristicssection.
Whentheaccuracyofonecurrentlimit(sourcingorsinking)ismoreimportantthantheother,itispossibletosetitsaccuracytobetterthan1%byadjustingtheexternalresistorortheappliedvoltage.
Theaccuracyoftheothercurrentlimitwillstillbeaffectedbyinternalmatching.
CurrentLimitFlagPinTheOPA567featuresanIFLAGpin(pin7)thatcanbemonitoredtodeterminewhenthepartisincurrentlimit.
TheoutputsignaloftheIFLAGpiniscompatibletostandardlogicinsingle-supplyapplications.
TheoutputsignalisaCMOSlogicgatethatswitchesfromV+toV–toindicatethattheamplifierisincurrentlimit.
TheIFLAGpincansourceandsinkupto25A.
Additionalparasiticcapacitancebetweenpins6and7cancauseinstabilityattheedgeofthecurrentlimit.
Avoidroutingthesetracesinparallelclosetoeachother.
QuiescentCurrentDependenceontheCurrentLimitSettingTheOPA567isalow-poweramplifier,withatypical3.
4mAquiescentcurrent(withthecurrentlimitconfiguredfor200mA).
Thequiescentcurrentvarieswiththecurrentlimitsetting—itincreases0.
5mAforeachadditional200mAincreaseinthecurrentlimit,asshowninFigure3.
FIGURE3.
QuiescentCurrentvsCurrentLimitSetting.
ENABLEPIN—OUTPUTDISABLETheEnablepincandisabletheOPA567withinmicrosec-onds.
Whendisabled,theamplifierdrawslessthan10Aanditsoutputentersahigh-impedancestatethatallowsmulti-plexing.
Itisimportanttonotethatwhentheamplifierisdisabled,theThermalFlagpin(TFLAG)circuitrycontinuestooperate.
ThisfeatureallowsuseoftheTFLAGpinoutputtoimplementthermalprotectionstrategies.
Formoredetails,pleaseseethesectiononthermalprotection.
TheOPA567Enablepinhasaninternalpull-upcircuit,soitdoesnothavetobeconnectedtothepositivesupplyfornormaloperation.
Todisabletheamplifier,theEnablepinmustbeconnectedtonomorethan(V–)+0.
8V.
Toenabletheamplifier,eitherallowtheEnablepintofloatorconnectittoatleast(V–)+2.
5V.
TheEnablepinisreferencedtothenegativesupply(V–).
Therefore,shutdownoperationisslightlydifferentinsingle-supplyanddual-supplyapplications.
Insingle-supplyoperation,V–typicallyequalscommonground;thus,theenable/disablelogicsignalandtheOPA567Enablepinarereferencedtothesamepotential.
Inthisconfiguration,thelogiclevelandtheOPA567Enablepincansimplybetiedtogether.
DisablingtheOPA567occursforvoltagelevelsoflessthan0.
8V.
TheOPA567isenabledatlogiclevelsgreaterthan2.
5V.
Indual-supplyoperation,thelogiclevelisreferencedtoalogicground.
However,theOPA567Enablepinisstillrefer-encedtoV–.
TodisabletheOPA567,thevoltagelevelofthelogicsignalneedstobelevel-shifted.
Thislevel-shiftingcanbedoneusinganoptocoupler,asshowninFigure4.
Examplesofoutputbehaviorduringdisabledandenabledconditionswithvariousloadimpedancesareshowninthetypicalcharacteristicssection.
Pleasenotethatthisbehaviorisafunctionofboardlayout,loadimpedances,andbypassstrategies.
Forsensitiveloads,theuseofalow-passfilterorotherprotectionstrategyisrecommended.
FIGURE4.
OPA567ShutdownConfigurationforDualSupplies.
1086420QUIESCENTCURRENTvsCURRENTLIMITSETTINGCurrentLimitSetting(A)QuiescentCurrent(mA)00.
511.
522.
5Optocoupler4N38NOTE:(1)Optional—mayberequiredtolimitleakagecurrentofoptocouplerathightemperatures.
EnableV+VO89112,34,51,12(a)+5V(b)HCTorTTLInHCTorTTLIn(a)(b)OPA567(1)V–OPA567SBOS287A15www.
ti.
comENSURINGMICROCONTROLLERCOMPATIBILITYNotallmicrocontrollersoutputthesamelogicstateafterpower-uporreset.
8051-typemicrocontrollers,forexample,outputlogicHighlevelsontheirportswhileothermodelspowerupwithlogicLowlevelsafterreset.
Inconfiguration(a)showninFigure4,theenable/disablesignalisappliedonthecathodesideofthephotodiodewithintheoptocoupler.
AlogicHighlevelcausestheOPA567tobeenabled,andalogicLowleveldisablestheOPA567.
Inconfiguration(b)ofFigure4,withthelogicsignalappliedontheanodeside,ahighleveldisablestheOPA567andalowlevelenablestheopamp.
RAIL-TO-RAILOUTPUTRANGETheOPA567hasaclassABoutputstagewithcommonsourcetransistorsthatareusedtoachieverail-to-railoutputswing.
Itwasdesignedtobeabletoswingclosertotherailthanotherexistinglinearamplifiers,evenwithhighoutputcurrentlevels.
Aquickwaytoestimatetheoutputswingwithvariousoutputcurrentrequirementsisbyusingtheequation:VSWING[typical]=0.
1IOPlotsoftheOutputSwingvsOutputCurrent,SupplyVoltage,andTemperatureareprovidedintheTypicalCharacteristicssection.
RAIL-TO-RAILINPUTRANGETheinputcommon-modevoltagerangeoftheOPA567extends100mVbeyondthesupplyrails.
ThisisachievedbyacomplementaryinputstagewithanN-channelinputdiffer-entialpairinparallelwithaP-channeldifferentialpair.
TheN-channelinputpairisactiveforinputvoltagesclosetothepositiverailwhiletheP-channelinputpairisactiveforinputvoltagesclosetothenegativerail.
Thetransitionpointistypicallyat(V+)–1.
3V,andthereisasmalltransitionregionaroundtheswitchingpointwherebothtransistorsareon.
Itisimportanttonotethatthetwoinputpairscanhaveoffsetsofdifferentsignsandmagnitudes.
Therefore,asthetransi-tionpointiscrossed,theoffsetoftheamplifierchanges.
Thisoffsetshiftaccountsforthereducedcommon-moderejectionratiooverthefullinputcommon-moderange.
OUTPUTPROTECTIONReactiveandEMF-generatingloadscanreturnloadcurrenttotheamplifier,causingtheoutputvoltagetoexceedthepower-supplyvoltage.
Thisdamagingconditioncanbeavoidedwithclampdiodesfromtheoutputterminaltothepowersupplies,asshowninFigure5.
Schottkyrectifierdiodeswitha3Aorgreatercontinuousratingarerecom-mended.
THERMALFLAGPINTheOPA567hasthermalsensingcircuitrythatprovidesawarningsignalwhenthedietemperatureexceedssafelimits.
UnlesstheTFLAGpinisconnectedtotheEnablepin,whenthisflagistriggered,thepartcontinuestooperateeventhoughthejunctiontemperatureexceeds150°C.
Thisdefaultoperationallowsmaximumusableoperationinveryharshconditionsbutdegradesreliability.
TheTFLAGpincanbeusedtoprovidefororderlysystemshutdownbeforefailureoccurs.
Itcanbealsousedtoevaluatethethermalenvironmenttodetermineneedforandappropriatedesignofashutdownmechanism.
ThethermalflagoutputsignalisfromaCMOSlogicgatethatswitchesfromV+toV–toindicatethattheamplifierisinthermallimit.
Thisflagoutputpincansourceandsinkupto25A.
TheTFLAGpinisHIGHduringnormaloperation.
Powerdissipatedintheamplifierwillcausethejunctiontemperaturetorise.
Whenthejunctiontemperatureexceeds150°C,theTFLAGpinwillgoLow,andremainLowuntiltheamplifierhascooledto130°C.
Despitethishysteresis,withamethodoforderlyshutdown,theTFLAGpincancycleonandoff,de-pendingonloadandsignalconditions.
Thislimitsthedissi-pationoftheamplifierbutmayhaveanundesirableeffectontheload.
ItispossibletoconnecttheTFLAGpindirectlytotheEnablepinforautomaticshutdownprotection.
Whenboththermalshutdownandtheamplifierenable/disablefunctionsaredesired,theexternallygeneratedcontrolsignalandtheTFLAGpinoutputsshouldbecombinedwithanANDgate;seeFigure6.
Thetemperatureprotectionwasdesignedtopro-tectagainstoverloadconditions.
Itwasnotintendedtoreplaceproperheatsinking.
ContinuouslyrunningtheOPA567inandoutofthermalshutdownwilldegradereliability.
FIGURE5.
OutputProtectionDiode.
OPA567OutputProtectionDiodeOutputProtectionDiodeISETRSETVO+V1,126894,5–In+In2,3–VOPA567SBOS287A16www.
ti.
comFIGURE6.
Enable/ShutdownControlUsingTFLAGPinandExternalControlSignal.
Anytendencytoactivatethethermalprotectioncircuitindi-catesexcessivepowerdissipationoraninadequateheatsink.
Forreliable,longterm,continuousoperation,thejunc-tiontemperatureshouldbelimitedto125°Cmaximum.
Toestimatethemarginofsafetyinacompletedesign(includingheatsink),increasetheambienttemperatureuntilthether-malprotectionistriggered.
Useworst-caseloadingandsignalconditions.
Forgood,long-termreliability,thermalprotectionshouldtriggermorethan25°Cabovethemaxi-mumexpectedambientconditionsofyourapplication.
Thisproducesajunctiontemperatureof125°Catthemaximumexpectedambientcondition.
Fasttransientsoflargeoutputcurrentswings(forexample,switchingquicklyfromsourcing2Atosinking2A)maycauseaglitchontheTFLAGpin.
Whenswitchinglargecurrentsisexpected,theuseofextrabypassbetweenthesuppliesoralow-passfilterontheTFLAGpinisrecommended.
POWERDISSIPATIONANDSAFEOPERATINGAREAPowerdissipationdependsonpowersupply,signal,andloadconditions.
Itisdominatedbythepowerdissipationoftheoutputtransistors.
ForDCsignals,powerdissipationisequaltotheproductofoutputcurrent,IOUTandtheoutputvoltageacrosstheconductingoutputtransistor(VS–VOUT).
Dissipa-tionwithACsignalsislower.
ApplicationBulletinSBOA022explainshowtocalculateormeasurepowerdissipationwithunusualsignalsandloadsandcanbefoundattheTIwebsite(www.
ti.
com).
Outputshort-circuitsareparticularlydemandingfortheam-plifierbecausethefullsupplyvoltageisseenacrosstheconductingtransistor.
Itisveryimportanttonotethatthetemperatureprotectionwillnotshutthepartdowninover-temperatureconditions,unlesstheTFLAGpinisconnectedtotheEnablepin;seethesectiononThermalFlag.
Figure7showsthesafeoperatingareaatroomtemperaturewithvariousheatsinkingefforts.
Notethatthesafeoutputcurrentdecreasesas(VS–VOUT)increases.
Figure8showsthesafeoperatingareaatvarioustemperatureswiththemetalheatsinkbeingsolderedtoa2ozcopperpad.
FIGURE7.
SafeOperatingAreaatRoomTemperature.
FIGURE8.
SafeOperatingAreaatVariousAmbientTempera-tures.
Metalheatsinksolderedtoa2ozcopperpad.
Thepowerthatcanbesafelydissipatedinthepackageisrelatedtotheambienttemperatureandtheheatsinkdesign.
TheQFNpackagewasspecificallydesignedtoprovideexcellentpowerdissipation,butboardlayoutgreatlyinflu-encestheheatdissipationofthepackage.
RefertotheQFNPackagesectionforfurtherdetails.
TheOPA567hasajunction-to-ambientthermalresistance(θJA)valueof38°C/Wwhensolderedtoa2ozcopperplane.
Thisvaluecanbefurtherdecreasedbytheadditionofforcedair.
SeeFigure9forthejunction-to-ambientthermalresis-tanceoftheQFN-12package.
Junctiontemperatureshouldbekeptbelow125°Cforreliableoperation.
Thejunctiontemperaturecanbecalculatedby:TJ=TA+PDθJAwhereθJA=θJC+θCATJ=JunctionTemperature(°C)TA=AmbientTemperature(°C)PD=PowerDissipated(W)θJA=Junction-to-AmbientThermalResistanceθJC=Junction-to-CaseThermalResistanceθCA=Case-to-AirThermalResistanceEnablePin2,31189TFLAGPinDisableOn10ANDOPA5671010.
1VS–VOUT(V)SAFEOPERATINGAREA(TA=25°C)OutputCurrent(A)0123456Thermalpadsolderedto2oz.
copperpad,withoutforcedair.
Thermalpadsolderedto2oz.
copperpad,with500lfmairflow.
1010.
1VS–VOUT(V)SAFEOPERATINGAREAThermalPadSoldered,VariousTAOutputCurrent(A)0123456TA=+85°CTA=+25°CTA=–40°CTA=0°COPA567SBOS287A17www.
ti.
comFIGURE9.
Junction-to-AmbientThermalResistancewithVariousHeatsinkingEfforts.
FIGURE10.
MaximumPowerDissipationvsTemperature.
FIGURE11.
ThermalResistancevsNumberofThermalVias.
FIGURE12.
FeedbackCapacitorforUsewithHigherImped-anceNetworks.
TheMaximumPowerDissipationvsTemperaturefortheheatsinkingmethodsreferencedinFigure9isshowninFigure10.
FEEDBACKCAPACITORIMPROVESRESPONSEForoptimumsettlingtimeandstabilitywithhigherimpedancefeedbacknetworks(RF>50k),itmaybenecessarytoaddafeedbackcapacitoracrossthefeedbackresistor,RF,asshowninFigure12.
ThiscapacitorcompensatesforthezerocreatedbythefeedbacknetworkimpedanceandtheinputcapacitanceoftheOPA567(andanyparasiticlayoutcapaci-tance).
Theeffectbecomesmoresignificantwithhigherimpedancenetworks.
Thesizeofthecapacitorneededisestimatedusingtheequation:RINCIN=RFCFwhereCINisthesumoftheinputcapacitanceoftheOPA567plustheparasiticlayoutcapacitance.
Toappropriatelydeterminerequiredheatsinkarea,requiredpowerdissipationshouldbecalculatedandtherelationshipbetweenpowerdissipationandthermalresistanceshouldbeconsideredtominimizeshutdownconditionsandallowforproperlong-termoperation(junctiontemperatureof125°C).
Oncetheheatsinkareahasbeenselected,worst-caseloadconditionsshouldbetestedtoensureproperthermalprotec-tion.
Forapplicationswithlimitedboardsize,refertoFigure11fortheapproximatethermalresistancerelativetothenumberofthermalvias.
TheQFN-12packageiswellsuitedforcontinu-ouspowerlevels,asshowninFigure10.
Higherpowerlevelsmaybeachievedinapplicationswithalowon/offdutycycle.
OPA567V+V–VOUTVINRIN81,122,34,59RINCIN=RFCFRFCLCINCINCFWhereCINisequaltotheOPA567inputcapacitance(approximately9pF)plusanyparasiticlayoutcapacitance.
HEATSINKINGMETHODθJAThepartissolderedtoa2ozcopperpadunderthe38exposedpad.
Solderedtocopperpadwithforcedairflow(150lfm).
36Solderedtocopperpadwithforcedairflow(250lfm).
35Solderedtocopperpadwithforcedairflow(500lfm).
346543210Temperature(°C)MAXIMUMPOWERDISSIPATIONINPACKAGEvsTEMPERATUREPowerDissipated(W)–75–500–25255075100125Thermalpadsolderedto2oz.
copperpad,with500lfmairlow.
Thermalpadsolderedto2oz.
copperpad,withoutforcedair.
TJ=150°C1009080706050403020100ThermalResistance,θJA(°C/W)0123456NumberofThermalViasTHERMALRESISTANCEvsNUMBEROFTHERMALVIASOPA567SBOS287A18www.
ti.
comQFNTHERMALLYENHANCEDPACKAGETheOPA567usestheQFN-12package,athermally-enhancedpackagedesignedtoeliminatetheuseofbulkyheatsinksandslugstraditionallyusedinthermalpackages.
Thispackagecanbeeasilymountedusingstandardprintedcircuitboard(PCB)assemblytechniques.
SeeQFN/SONPCBAttachmentApplicationNote(SLUA271)locatedatwww.
ti.
com.
Thethermalresistancejunction-to-ambient(RθJA)oftheQFNpackagedependsonthePCBlayout.
UsingthermalviasandwidePCBtracesimprovethermalresistance.
ThethermalpadmustbesolderedtothePCB.
ThethermalpadshouldeitherbeleftfloatingorconnectedtoV–.
LAYOUTGUIDELINESTheOPA567isapoweramplifierthatrequiresproperlayoutforbestperformance.
Anexamplelayoutisappendedtotheendofthisdatasheet.
Refinementstothislayoutmayberequiredbasedonassemblyprocessrequirements.
Keeppower-supplyleadsasshortaspossible.
Thispracticewillkeepinductancelowandresistivelossesataminimum.
Aminimumof18gaugewirethicknessisrecommendedforpower-supplyleads.
Thewirelengthshouldbelessthan8inches.
Properpower-supplybypassingwithlowESRcapacitorsisessentialtoachievegoodperformance.
Aparallelcombina-tionof100nFceramicand47Ftantalumbypasscapacitorswillprovidelowimpedanceoverawidefrequencyrange.
Bypasscapacitorsshouldbeplacedascloseaspracticaltothepower-supplypinsoftheOPA567.
PCBtracesconductinghighcurrents,suchasfromoutputtoloadorfromthepower-supplyconnectortothepower-supplypinsoftheOPA567shouldbekeptaswideandshortaspossible.
Thispracticewillkeepinductancelowandresistivelossestoaminimum.
ThenineholesinthelandingpatternfortheOPA567areforthethermalviasthatconnectthethermalpadoftheOPA567totheheatsinkareaonthePCB.
Alltracesconductinghighcurrentsareverywideforlowestinductanceandminimalresistivelosses.
OPA567SBOS287A19www.
ti.
comFIGURE15.
SinglePowerAmplifierDrivingBidirectionalCurrentthroughaTECusingAsymmetricalBipolarPowerSupplies.
FIGURE13.
GroundedAnodeLEDDriver.
APPLICATIONCIRCUITSFIGURE14.
Bridge-TiedLoadDriver.
LuxeonStar-0High-PowerLED1,12894,5(1)2,36RSETVOfO=10kHzVINOPA567R149.
9kRSHUNT1IOR24.
99k4.
99k0.
0033FR349.
9k–5V+1V0V0mA–100mA0V–2.
5VFeedbackforConstantCurrent,1VInputper100mAOutputasShown.
NOTE:(1)Bypassasrecommended.
RSETVSETTECOPA5671kHeat/CoolVTECVTEC=2(VIN–VSET)+–81,124,52,3ISETISET4,589361,122,3RSETNOTE:(1)Bypassasrecommended.
5V(1)5V91kVINOPA567(1)OPA56781,124,56–1.
2V2,3NOTE:TotalSupplyMustbe<5.
5VCooling/Heating.
NOTE:(1)Bypassasrecommended.
RSETISET+3.
3V(1)9VINTECILPACKAGINGINFORMATIONOrderableDeviceStatus(1)PackageTypePackageDrawingPinsPackageQtyEcoPlan(2)Lead/BallFinishMSLPeakTemp(3)OPA567AIRHGRACTIVEVQFNRHG122500Green(RoHS&noSb/Br)CUNIPDAULevel-2-260C-1YEAROPA567AIRHGRG4ACTIVEVQFNRHG122500Green(RoHS&noSb/Br)CUNIPDAULevel-2-260C-1YEAROPA567AIRHGTACTIVEVQFNRHG12250Green(RoHS&noSb/Br)CUNIPDAULevel-2-260C-1YEAROPA567AIRHGTG4ACTIVEVQFNRHG12250Green(RoHS&noSb/Br)CUNIPDAULevel-2-260C-1YEAR(1)Themarketingstatusvaluesaredefinedasfollows:ACTIVE:Productdevicerecommendedfornewdesigns.
LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect.
NRND:Notrecommendedfornewdesigns.
Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartinanewdesign.
PREVIEW:Devicehasbeenannouncedbutisnotinproduction.
Samplesmayormaynotbeavailable.
OBSOLETE:TIhasdiscontinuedtheproductionofthedevice.
(2)EcoPlan-Theplannedeco-friendlyclassification:Pb-Free(RoHS),Pb-Free(RoHSExempt),orGreen(RoHS&noSb/Br)-pleasecheckhttp://www.
ti.
com/productcontentforthelatestavailabilityinformationandadditionalproductcontentdetails.
TBD:ThePb-Free/Greenconversionplanhasnotbeendefined.
Pb-Free(RoHS):TI'sterms"Lead-Free"or"Pb-Free"meansemiconductorproductsthatarecompatiblewiththecurrentRoHSrequirementsforall6substances,includingtherequirementthatleadnotexceed0.
1%byweightinhomogeneousmaterials.
Wheredesignedtobesolderedathightemperatures,TIPb-Freeproductsaresuitableforuseinspecifiedlead-freeprocesses.
Pb-Free(RoHSExempt):ThiscomponenthasaRoHSexemptionforeither1)lead-basedflip-chipsolderbumpsusedbetweenthedieandpackage,or2)lead-baseddieadhesiveusedbetweenthedieandleadframe.
ThecomponentisotherwiseconsideredPb-Free(RoHScompatible)asdefinedabove.
Green(RoHS&noSb/Br):TIdefines"Green"tomeanPb-Free(RoHScompatible),andfreeofBromine(Br)andAntimony(Sb)basedflameretardants(BrorSbdonotexceed0.
1%byweightinhomogeneousmaterial)(3)MSL,PeakTemp.
--TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.
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PACKAGEOPTIONADDENDUMwww.
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012.
45.
35.
31.
58.
012.
0Q2OPA567AIRHGTVQFNRHG12250180.
012.
45.
35.
31.
58.
012.
0Q2PACKAGEMATERIALSINFORMATIONwww.
ti.
com14-Jul-2012PackMaterials-Page1*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQLength(mm)Width(mm)Height(mm)OPA567AIRHGRVQFNRHG122500367.
0367.
035.
0OPA567AIRHGTVQFNRHG12250210.
0185.
035.
0PACKAGEMATERIALSINFORMATIONwww.
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