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| P r o d u c t IIn n o v a t i o n FFr room nnova m PA91 PA91 ThePA91isahighvoltage,lowquiescentcurrentMOSFEToperationalamplifierdesignedasalowcostsolutionfordrivingcontinuousoutputcurrentsupto200mA and pulse currents up to 350mA. The safe operating area(SOA)hasnosecondbreakdownlimitationsand canbeobservedforalltypeloadsbychoosinganappropriatecurrentlimitingresistor.TheMOSFEToutput stageisbiasedABforlinearoperation.Externalcompensation provides flexibility in choosing bandwidth and slew rate for the application.APEX's Power SIP packageusesaminimumofboardspaceallowingfor highdensitycircuitboards.The12-pinPowerSIPpackageiselectricallyisolated. High Voltage Power Operational Amplifiers HIGHVOLTAGE--450V(225V) LOWQUIESCENTCURRENT--10mA HIGHOUTPUTCURRENT--200mA PROGRAMMABLECURRENTLIMIT HIGHSLEWRATE--300V/s FEATURES DESCRIPTION APPLICATIONS PIEZOELECTRICPOSITIONING HIGHVOLTAGEINSTRUMENTATION ELECTROSTATICTRANSDUCERS PROGRAMMABLEPOWERSUPPLIESUP TO440V EQUIVALENTSCHEMATIC PA91U http://www.cirrus.com Copyright (c) Cirrus Logic, Inc. 2008 (All Rights Reserved) AUG2008 1 APEX - PA91REVG PA91 ExTERNALCONNECTIONS P r o d u c t I n n o v a t i o nF r o m Formedleadsavailable SeepackagestyleEE 12-pinSIP PACKAGE STYLEDP 1.CHARACTERISTICSANDSPECIFICATIONS AbSOLUTEMAxIMUMRATINGS Parameter SUPPLYVOLTAGE,+VSto-VS OUTPUTCURRENT,source,sink,peak,withinSOA POWERDISSIPATION,continuous@TC=25C INPUTVOLTAGE,differential INPUTVOLTAGE,commonmode TEMPERATURE,pinsolder,10smax. TEMPERATURE,junction(Note2) TEMPERATURERANGE,storage OPERATINGTEMPERATURE,case -40 -25 -20 -VS Symbol Min Max 450 350 30 20 VS 260 150 85 85 Units V mA W V V C C C C CAUTION ThePA91isconstructedfromMOSFETtransistors.ESDhandlingproceduresmustbeobserved. Theexposedsubstratecontainsberyllia(BeO).Donotcrush,machine,orsubjecttotemperatures inexcessof850Ctoavoidgeneratingtoxicfumes. SPECIFICATIONS Parameter INPUT OFFSETVOLTAGE,initial OFFSETVOLTAGEvs.temperature OFFSETVOLTAGEvs.supply OFFSETVOLTAGEvs.time BIASCURRENT,initial BIASCURRENTvs.supply OFFSETCURRENT,initial INPUTIMPEDANCE,DC INPUTCAPACITANCE COMMONMODEVOLTAGERANGE (Note3) COMMONMODEREJECTION,DC NOISE VCM=90V 100KHzbandwidth, RS=1K,CC=OPEN VS15 80 98 1 Fulltemperaturerange 0.5 15 10 75 200 4 50 10 11 TestConditions1 Min Typ Max 2 50 25 2000 500 Units mV V/C V/V V/KHz pA pA/V pA pF V dB VRMS 4 2 PA91U P r o d u c t I n n o v a t i o nF r o m PA91 TestConditions1 Min 94 Parameter GAIN OPENLOOP@15Hz GAINBANDWIDTHPRODUCT@1MHz POWERBANDWIDTH PHASEMARGIN OUTPUT Typ 111 100 470 60 Max Units dB MHz KHz V mA V/S pF S RL=2K,CC=OPEN RL=2K,CC=OPEN RL=2K,CC=OPEN Fulltemperaturerange VOLTAGESWING(Note3) IO=200mA CURRENT,continuous SLEWRATE,AV=100 CAPACITIVELOAD,AV=+1 SETTLINGTIMEto0.1% RESISTANCE,noload POWERSUPPLY VOLTAGE(Note5) CURRENT,quiescent THERMAL RESISTANCE,AC,junctiontocase(Note4) Fulltemprange,F>60Hz RESISTANCE,DC,junctiontocase RESISTANCE,junctiontoair TEMPERATURERANGE,case Fulltemprange,F<60Hz Fulltemprange Meetsfullrangespecifications CC=OPEN Fulltemperaturerange CC=OPEN,2Vstep VS12 200 240 470 VS10 300 1 50 40 150 10 225 14 2.5 4.2 V mA C/W C/W C/W C 30 -25 +85 NOTES: 1. (AllMin/MaxcharacteristicsandspecificationsareguaranteedovertheSpecifiedOperatingConditions.Typicalperformancecharacteristicsandspecificationsarederivedfrommeasurementstaken attypicalsupplyvoltagesandTC=25C). 2. Longtermoperationatthemaximumjunctiontemperaturewillresultinreducedproductlife.Derate powerdissipationtoachievehighMTTF. 3. +VSand-VSdenotethepositiveandnegativepowersupplyrailrespectively. 4. Ratingappliesiftheoutputcurrentalternatesbetweenbothoutputtransistorsataratefasterthan 60Hz. 5. Deratemaxsupplyrating0.625V/Cbelow25Ccase.Noderatingneededabove25Ccase. PA91U PA91 P r o d u c t I n n o v a t i o nF r o m PA91U P r o d u c t I n n o v a t i o nF r o m PA91 TYPICALAPPLICATION LOWPOWER,PIEZOELECTRICPOSITIONING Piezopositioningmaybeappliedtothefocusingofsegmented mirror systems. The composite mirror may be composedofhundredsofelements,eachrequiringfocusingundercomputercontrol.Insuchcomplexsystemsthe PA91 reduces the costs of power supplies and cooling withitsadvantagesoflowcostandlowquiescentpower consumptionwhileincreasingcircuitdensitywiththeSIP package. PHASECOMPENSATION GAIN 1 5 10 30 CC* 68pF 10pF 4.7pF NONE RC 100 100 0 0 *CCToberatedforthefullsupplyvoltage+VSto-VS.UseNPOceramic(COG)type. PleasereadApplicationNote1"GeneralOperatingConsiderations"whichcoversstability,supplies,heatsinking, mounting,currentlimit,SOAinterpretation,andspecificationinterpretation.Visitwww.cirrus.comfordesigntools thathelpautomatetaskssuchascalculationsforstability,internalpowerdissipation,currentlimit;heatsinkselection;Apex'scompleteApplicationNoteslibrary;TechnicalSeminarWorkbook;andEvaluationKits. Forproperoperation,thecurrentlimitresistor(RCL)mustbeconnectedasshownintheexternalconnectiondiagram.Foroptimumreliabilitytheresistorvalueshouldbesetashighaspossible.Thevalueiscalculatedasfollows; withthemaximumpracticalvalueof32ohms. .65 RCL= ILIM The MOSFET output stage of this power operational amplifierhastwodistinctlimitations: 1. ThecurrenthandlingcapabilityoftheMOSFETgeometryandthewirebonds. 2. ThejunctiontemperatureoftheoutputMOSFETs. NOTE:Theoutputstageisprotectedagainsttransient flyback.However,forprotectionagainstsustained,high energyflyback,externalfast-recoverydiodesshouldbe used. The safe operating area curves define the maximum additional internal power dissipation the amplifier can toleratewhenitproducesthenecessaryoutputtodrive anexternalload. GENERAL CURRENTLIMIT SAFEOPERATINGAREA(SOA) SAFEOPERATINGCURVES PA91U PA91 INPUTPROTECTION P r o d u c t I n n o v a t i o nF r o m Although the PA91 can withstand differential voltages up to 20V, additional external protection is recommended. Low leakage, low capacitance JFETs connected as diodes are recommended (e.g. 2N4416, Q1-Q4 in Figure 2). The differential input voltage will be clampedto1.4V.Thisissufficientoverdrivetoproducemaximum powerbandwidth. Unidirectionalzenerdiodetransientsuppressorsarerecommended as protection on the supply pins. See Figure 2.The zeners clamp transientstovoltageswithinthepowersupplyratingandalsoclamp powersupplyreversalstoground.Whetherthezenersareusedor not,thesystempowersupplyshouldbeevaluatedfortransientperformanceincludingpower-onovershootandpower-offpolarityreversalsaswellaslineregulation. Conditionswhichcancauseopencircuitsorpolarityreversalsoneitherpowersupplyrailshouldbeavoidedorprotectedagainst.Reversalsoropensonthenegativesupplyrailisknowntoinduceinputstagefailure.Unidirectional transzorbspreventthis,anditisdesirablethattheybebothelectricallyandphysicallyasclosetotheamplifieras possible. POWERSUPPLYPROTECTION STAbILITY ThePA91isexternallycompensatedandperformancecanbetailoredtotheapplication.Usethegraphsofsmall signalresponseandpowerresponseasaguide.ThecompensationcapacitorCCmustberatedat500Vworking voltage.AnNPOcapacitorisrecommended.ThecompensationnetworkCCRCmustbemountedcloselytothe amplifierpins4and5toavoidspuriousoscillation. Whenpin3(IQ)isshortedtopin5(CC2)theABbiasingoftheoutputstageisdisabled.Thisraisesdistortionsince theoutputstageisthenclassCbiased,butreducesthequiescentcurrentby1mAforapowerdissipationsavings of0.4W.Pin3maybeleftopenifnotused. QUIESCENTCURRENTREDUCTION CONTACTINGCIRRUSLOGICSUPPORT ForallApexPrecisionPowerproductquestionsandinquiries,calltollfree800-546-2739inNorthAmerica. Forinquiriesviaemail,pleasecontacttucson.support@cirrus.com. InternationalcustomerscanalsorequestsupportbycontactingtheirlocalCirrusLogicSalesRepresentative. Tofindtheonenearesttoyou,gotowww.cirrus.com IMPORTANTNOTICE CirrusLogic,Inc.anditssubsidiaries("Cirrus")believethattheinformationcontainedinthisdocumentisaccurateandreliable.However,theinformationissubject tochangewithoutnoticeandisprovided"ASIS"withoutwarrantyofanykind(expressorimplied).Customersareadvisedtoobtainthelatestversionofrelevant informationtoverify,beforeplacingorders,thatinformationbeingreliedoniscurrentandcomplete.Allproductsaresoldsubjecttothetermsandconditionsofsale suppliedatthetimeoforderacknowledgment,includingthosepertainingtowarranty,indemnification,andlimitationofliability.NoresponsibilityisassumedbyCirrus fortheuseofthisinformation,includinguseofthisinformationasthebasisformanufactureorsaleofanyitems,orforinfringementofpatentsorotherrightsofthird parties.ThisdocumentisthepropertyofCirrusandbyfurnishingthisinformation,Cirrusgrantsnolicense,expressorimpliedunderanypatents,maskworkrights, copyrights,trademarks,tradesecretsorotherintellectualpropertyrights.CirrusownsthecopyrightsassociatedwiththeinformationcontainedhereinandgivesconsentforcopiestobemadeoftheinformationonlyforusewithinyourorganizationwithrespecttoCirrusintegratedcircuitsorotherproductsofCirrus.Thisconsent doesnotextendtoothercopyingsuchascopyingforgeneraldistribution,advertisingorpromotionalpurposes,orforcreatinganyworkforresale. CERTAINAPPLICATIONSUSINGSEMICONDUCTORPRODUCTSMAYINVOLVEPOTENTIALRISKSOFDEATH,PERSONALINJURY,ORSEVEREPROPERTYORENVIRONMENTALDAMAGE("CRITICALAPPLICATIONS").CIRRUSPRODUCTSARENOTDESIGNED,AUTHORIZEDORWARRANTEDTOBE SUITABLEFORUSEINPRODUCTSSURGICALLYIMPLANTEDINTOTHEBODY,AUTOMOTIVESAFETYORSECURITYDEVICES,LIFESUPPORTPRODUCTSOROTHERCRITICALAPPLICATIONS.INCLUSIONOFCIRRUSPRODUCTSINSUCHAPPLICATIONSISUNDERSTOODTOBEFULLYATTHECUSTOMER'SRISKANDCIRRUSDISCLAIMSANDMAKESNOWARRANTY,EXPRESS,STATUTORYORIMPLIED,INCLUDINGTHEIMPLIEDWARRANTIESOF MERCHANTABILITYANDFITNESSFORPARTICULARPURPOSE,WITHREGARDTOANYCIRRUSPRODUCTTHATISUSEDINSUCHAMANNER.IFTHE CUSTOMERORCUSTOMER'SCUSTOMERUSESORPERMITSTHEUSEOFCIRRUSPRODUCTSINCRITICALAPPLICATIONS,CUSTOMERAGREES, BYSUCHUSE,TOFULLYINDEMNIFYCIRRUS,ITSOFFICERS,DIRECTORS,EMPLOYEES,DISTRIBUTORSANDOTHERAGENTSFROMANYANDALL LIABILITY,INCLUDINGATTORNEYS'FEESANDCOSTS,THATMAYRESULTFROMORARISEINCONNECTIONWITHTHESEUSES. CirrusLogic,Cirrus,andtheCirrusLogiclogodesigns,ApexPrecisionPower,ApexandtheApexPrecisionPowerlogodesignsaretrademarksofCirrusLogic,Inc. Allotherbrandandproductnamesinthisdocumentmaybetrademarksorservicemarksoftheirrespectiveowners. PA91U |
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