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P r o d u c t IIn n o v a t i o n FFr room m Product nnovation
PA94 PA94
ThePA94isahighvoltage,MOSFEToperationalamplifierdesignedasalowcostsolutionfordrivingcontinuousoutputcurrentsupto100mAandpulsecurrents upto200mAintocapacitiveloads.Thesafeoperating area(SOA)hasnosecondbreakdownlimitationsand canbeobservedforallloadtypesbychoosinganappropriatecurrentlimitingresistor.TheMOSFEToutput stageisbiasedABforlinearoperation.Externalcompensation provides flexibility in choosing bandwidth and slew rate for the application.APEX's Power SIP packageusesaminimumofboardspaceallowingfor highdensitycircuitboards..ThePowerSIPpackageis electricallyisolated.Isolatingthermalwashers(TW13) preventarcingfrompinstoheatsink.
High Voltage Power Operational Amplifiers
HIGHVOLTAGE--900V(450V) HIGHSLEWRATE--500V/S HIGHOUTPUTCURRENT--100mA PROGRAMMABLECURRENTLIMIT HIGHVOLTAGEINSTRUMENTATION PROGRAMMABLEPOWERSUPPLIESUP TO430V MASSSPECTROMETERS SEMICONDUCTORMEASUREMENTEQUIPMENT
FEATURES
DESCRIPTION
APPLICATIONS
EQUIVALENT SCHEMATIC
PA94U
http://www.cirrus.com
Copyright (c) Cirrus Logic, Inc. 2008
(All Rights Reserved)
AUG2008 APEX - PA94UREVK
PA94
EXTERNALCONNECTIONS
P r o d u c t I n n o v a t i o nF r o m
PATENTED
Formedleadsavailable SeepackagestyleEC
8-pinSIP PACKAGE STYLEDQ
1. CHARACTERISTICS ANd SPECIfICATIoNS AbSoLUTE MAXIMUM RATINGS
Parameter
SUPPLYVOLTAGE,+VS to -VS OUTPUTCURRENT,source,sink,withinSOA POWERDISSIPATION,continuous@TC=25C INPUTVOLTAGE,differential INPUTVOLTAGE,commonmode(Note3) TEMPERATURE,pinsolder,10smax. TEMPERATURE,junction(Note2) TEMPERATURERANGE,storage OPERATINGTEMPERATURERANGE,case -40 -25 -20 -VS
Symbol
Min
Max
900 200 30 20 VS 260 150 85 85
Units
V mA W V V C C C C
CAUTION
ThePA94isconstructedfromMOSFETtransistors.ESDhandlingproceduresmustbeobserved. Theexposedsubstratecontainsberyllia(BeO).Donotcrush,machine,orsubjecttotemperatures inexcessof850Ctoavoidtoxicfumes. Parameter TestConditions Min Typ
0.5 Fulltemperaturerange 15 10 75 200 4 50 1011 4 VS=450V VCM=90V 10KHzbandwidth, RS = 1K VS30 80 98 2 500 2000
SPECIFICATIONS
Max
5 50 25
Units
mV V/C V/V V/kHz pA pA/V pA pF V dB VRMS
INPUT OFFSETVOLTAGE,initial OFFSETVOLTAGEvs.temperature OFFSETVOLTAGEvs.supply OFFSETVOLTAGEvs.time BIASCURRENT,initial BIASCURRENTvs.supply OFFSETCURRENT,initial INPUTIMPEDANCE,DC INPUTCAPACITANCE COMMONMODEVOLTAGERANGE (Note3) COMMONMODEREJECTION,DC NOISE
2

PA94U
P r o d u c t I n n o v a t i o nF r o m
PA94
TestConditions Min
94
Parameter
GAIN OPENLOOP@15Hz GAINBANDWIDTHPRODUCT@1MHz POWERBANDWIDTH PHASEMARGIN,AV=100 OUTPUT VOLTAGESWING CURRENT,continuous SLEWRATE,AV=100 SETTLINGTIME,to0.1% RESISTANCE POWERSUPPLY VOLTAGE(Note5) CURRENT,quiescenttotal CURRENT,quiescentoutputstageonly THERMAL RESISTANCE,AC,junctiontocase (Note4) RESISTANCE,DC,junctiontocase RESISTANCE,junctiontoair TEMPERATURERANGE,case
Typ
115 140 300 60
Max
Units
dB MHz kHz V mA V/S S
RL=5K RL=5K RL=5K Fulltemprange IO=70mA CC=2.2pF 2VStep noload
VS24 100 500
VS20 700 1 100
50
300 17
450 24 120
V mA A C/W C/W C/W C
Fulltemprange,F>60Hz Fulltemprange,F<60Hz Fulltemprange Meetsfullrangespecifications -25 30
2.5 4.2 +85
NOTES: 1. Unlessotherwisenoted:TC=25C,DCinputspecificationsarevaluegiven.Powersupplyvoltage istypicalrating.Cc=4.7pF. 2. Longtermoperationatthemaximumjunctiontemperaturewillresultinreducedproductlife.Derate internalpowerdissipationtoachievehighMTTF. 3. Althoughsupplyvoltagescanrangeupto450Vtheinputpinscannotswingoverthisrange.The inputpinsmustbeatleast30Vfromeithersupplyrailbutnotmorethan450Vfromeithersupplyrail. Seetextforamorecompletedescriptionofthecommonmodevoltagerange. 4. Ratingappliesiftheoutputcurrentalternatesbetweenbothoutputtransistorsataratefasterthan 60Hz. 5. Deratemaxsupplyrating0.625V/Cbelow25Ccase.Noderatingneededabove25Ccase.
TYPICALAPPLICATION
Piezopositioningmaybeappliedtothefocusingofsegmented mirror systems. The composite mirror may be composedofhundredsofelements,eachrequiringfocusingundercomputercontrol.Insuchcomplexsystemsthe PA94 reduces the costs of power supplies and cooling withitsadvantagesoflowcostandlowquiescentpower consumptionwhileincreasingcircuitdensitywiththeSIP package.
PA94U

PA94
P r o d u c t I n n o v a t i o nF r o m
PHASE CoMPENSATIoN
GAIN CC 100 2.2pF 50 4.7pF 10 22pF CCratedforfullsupplyvoltage. .7 RLIM= ILIM
4

PA94U
P r o d u c t I n n o v a t i o nF r o m
PA94
WiththeuniquecombinationofhighvoltageandspeedofthePA94,traditionalformulasforheatsinkselectionwill falselylowertheapparentpowerhandlingcapabilityofthisamplifier.TomoreaccuratelypredictoperatingtemperaturesusePowerDesign1revision10orhigher,orusethefollowingprocedure: Findinternaldissipation(PD)resultingfromdrivingtheload.UsePowerDesignorrefertoApexApplicationsNote 1,GeneralOperatingConsidertaions,paragraph7.Findtotalquiescentpower(PDQ)bymultiplying0.024AbyVSS (totalsupplyvoltage).Findoutputstagequiescentpower(PDQOUT)bymultiplying0.00012byVSS. Calculateaheatsinkratingwhichwillmaintainthecaseat85Corlower.
INTERNAL PoWER dISSIPATIoN ANd HEATSINK SELECTIoN
Where:TC=maximumcasetemperatureallowed TA=maximumambienttemperatureencountered Calculateaheatsinkratingwhichwillmaintainoutputtransistorjunctionsat150Corlower.
Where:TJ=maximumjunctiontemperatureallowed. ROJC=ACorDCthermalresistancefromthespecificationtable. Usethelargerheatsinkofthesetwocalculations. PowerDesignisanExcelspreadsheetavailablefreefromwww.cirrus.com PleasereadApplicationNote1"GeneralOperatingConsiderations"whichcoversstability,supplies,heatsinking, mounting,currentlimit,SOAinterpretation,andspecificationinterpretation.Visitwww.cirrus.comfordesigntools thathelpautomatetaskssuchascalculationsforstability,internalpowerdissipation,currentlimit;heatsinkselection;Apex'scompleteApplicationNoteslibrary;TechnicalSeminarWorkbook;andEvaluationKits. For proper operation, the current limit resistor (RLIM) must be connected as shown in the external connection diagram. The minimum value is 3.5 ohm, however for optimum reliability the resistor value should be set as high as possible. The value is calculated as follows; with the maximum practical value of30ohms. .7 RLIM= ILIM
GENERAL
CURRENT LIMIT
Operationalamplifiersareusuallydesignedtohaveacommonmodeinputvoltagerangethatapproximatesthe powersupplyvoltagerange.However,tokeepthecostaslowaspossibleandstillmeettherequirementsofmost applicationsthecommonmodeinputvoltagerangeofthePA94isrestricted.Theinputpinsmustalwaysbealeast 30Vfromeithersupplyvoltagebutnevermorethan450V.ThismeansthatthePA94cannotbeusedinapplications wherethesupplyvoltagesareextremelyunbalanced.Forexample,supplyvoltagesof+800Vand-100Vwouldnot beallowedinanapplicationwherethenon-invertingpinisgroundedbecauseinnormaloperationbothinputpins wouldbeat0Vandthedifferencevoltagebetweenthepositivesupplyandtheinputpinswouldbe800V.Inthis kindofapplication,however,supplyvoltages+450Vand-100Vdoesmeettheinputcommonmodevoltagerange requirementssincethemaximumdifferencevoltagebetweentheinputspinsandthesupplyvoltageis450V(the maximumallowed).Theoutputhasnosuchrestrictionsonitsvoltageswing.Theoutputcanswingwithin24Vof eithersupplyvoltageregardlessofvaluesolongasthetotalsupplyvoltagedoesnotexceed900V.
CoMMoN ModE INPUT RANGE
PA94U

PA94
INPUTPROTECTION
P r o d u c t I n n o v a t i o nF r o m
FIGURE1.OVERVOLTAGEPROTECTION
Although the PA94 can withstand differential input voltages up to 20V, additional external protection is recommended. In most applications1N4148or1N914signaldiodesaresufficient(D1,D2in Figure1a).Inmoredemandingapplicationswherelowleakageor lowcapacitanceareofconcern2N4416or2N5457-2N5459JFETs connectedasdiodeswillberequired(Q1,Q2inFigure1b).Ineithercasetheinputdifferentialvoltagewillbeclampedto.7V.This issufficientoverdrivetoproducemaximumpowerbandwidth.Note thatthisprotectiondoesnotautomaticallyprotecttheamplifierfrom excessivecommonmodeinputvoltages. Unidirectionalzenerdiodetransientsuppressorsarerecommended as protection on the supply pins. The zeners clamp transients to voltageswithinthepowersupplyratingandalsoclamppowersupply reversals to ground. Whether the zeners are used or not, the systempowersupplyshouldbeevaluatedfortransientperformance includingpower-onovershootandpower-offpolarityreversalaswell aslineregulation. Conditionswhichcancauseopencircuitsorpolarityreversalsoneitherpowersupplyrailshouldbeavoidedorprotectedagainst.Reversalsoropensonthenegativesupplyrailisknowntoinduceinputstagefailure.Unidirectional transzorbspreventthis,anditisdesirablethattheybebothelectricallyandphysicallyasclosetotheamplifieras possible.
POWERSUPPLYPROTECTION
STABILITY
ThePA94isstableatgainsof100ormorewithaNPO(COG)compensationcapacitorof2.2pF.Thecompensation capacitor,Cc,intheexternalconnectionsdiagrammustberatedat1000Vworkingvoltageandmountedcloselyto pins4and6topreventspuriousoscillation.Acompensationcapacitorlessthan2.2pFisnotrecommended. ThecompensationcapacitorCcmustberatedforthetotalsupplyvoltage.AnNPO(COG)capacitorrateda1kVis recommended. Ofequalimportancearethevoltageratingandvoltagecoefficientofthegainsettingfeedbackresistor.Typicalvoltageratingsoflowwattageresistorsare150to250V.Upto500Vcanappearacrossthefeedbackresistor.High voltageratedresistorscanbeobtained.Howevera1megohmfeedbackresistorcomposedoffive200kresistorsin serieswillproducethepropervoltagerating. TheoperatingvoltagesofthePA94arepotentiallylethal.Duringcircuitdesigndevelopafunctioningcircuitatthe lowestpossiblevoltages.Cliptestleadsshouldbeusedfor"handsoff"measurementswhiletroubleshooting.
EXTERNAL CoMPoNENTS
CAUTIONS

PA94U
P r o d u c t I n n o v a t i o nF r o m
PA94
CONTACTINGCIRRUSLOGICSUPPORT
ForallApexPrecisionPowerproductquestionsandinquiries,calltollfree800-546-2739inNorthAmerica. Forinquiriesviaemail,pleasecontacttucson.support@cirrus.com. InternationalcustomerscanalsorequestsupportbycontactingtheirlocalCirrusLogicSalesRepresentative. Tofindtheonenearesttoyou,gotowww.cirrus.com
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PA94U

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