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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
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