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| P r o d u c t II n n o v a t i o n FFr room nnova m PA95 PA95 DESCRIPTION High Voltage Power Operational Amplifiers HIGHVOLTAGE--900V(450V) LOWQUIESCENTCURRENT--1.6mA HIGHOUTPUTCURRENT--100mA PROGRAMMABLECURRENTLIMIT HIGHVOLTAGEINSTRUMENTATION PROGRAMMABLEPOWERSUPPLIESUP TO430V MASSSPECTROMETERS SEMICONDUCTORMEASUREMENT EQUIPMENT FEATURES APPLICATIONS ThePA95isahighvoltage,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) arerecommendedtopreventarcingfrompinstoheatsink. EQUIVALENT SCHEMATIC PA95U http://www.cirrus.com Copyright (c) Cirrus Logic, Inc. 2008 (All Rights Reserved) AUG2008 APEX - PA95UREVI PA95 EXTERNAL CONNECTIONS P r o d u c t I n n o v a t i o nF r o m PATENTED 1. CHARACTERISTICS AND SPECIFICATIONS AbSOLUTE MAXIMUM RATINGS Parameter SUPPLYVOLTAGE,+VSto-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 Formedleadsavailable SeepackagestyleEC 8-pin SIP PACKAGE STYLE DQ Symbol Min Max 900 200 30 20 VS 260 150 85 85 Units V mA W V V C C C C CAUTION ThePA95isconstructedfromMOSFETtransistors.ESDhandlingproceduresmustbeobserved. Theexposedsubstratecontainsberyllia(BeO).Donotcrush,machine,orsubjecttotemperatures inexcessof850Ctoavoidgeneratingtoxicfumes. Parameter Test Conditions Min Typ 0.5 Fulltemperaturerange 15 10 75 200 4 50 10 VS=250V VCM=90V 10KHzbandwidth, RS = 1K VS30 80 98 2 11 SPECIFICATIONS Max 5 50 25 2000 500 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 INPUTRESISTANCE,DC INPUTCAPACITANCE COMMONMODEVOLTAGERANGE (Note3) COMMONMODEREJECTION,DC NOISE 4 2 PA95U P r o d u c t I n n o v a t i o nF r o m PA95 Test Conditions Min 94 Parameter GAIN OPENLOOP@15Hz GAINBANDWIDTHPRODUCT@1MHz POWERBANDWIDTH PHASEMARGIN,AV=10 OUTPUT VOLTAGESWING CURRENT,continuous SLEWRATE,AV=100 SETTLINGTIME,to0.1% RESISTANCE POWER SUPPLY VOLTAGE(Note5) CURRENT,quiescent THERMAL Typ 118 10 20 60 Max Units dB MHz kHz V mA V/S S RL=5K RL=5K RL=5K Fulltemprange IO=70mA CC=4.7pF 2VStep noload VS24 100 VS20 30 1 100 50 300 1.6 450 2.2 2.5 4.2 V mA C/W C/W C/W C RESISTANCE,AC,junctiontocase(Note4) Fulltemprange,F>60Hz RESISTANCE,DC,junctiontocase RESISTANCE,junctiontoair TEMPERATURERANGE,case Fulltemprange,F<60Hz Fulltemprange -25 30 +85 NOTES: 1. Unlessotherwisenoted:TC=25C,DCinputspecificationsarevaluegiven.Powersupplyvoltage istypicalrating.Cc=4.7pF. 2. Longtermoperationatthemaximumjunctiontemperaturewillresultinreducedproductlife.Derate internalpowerdissipationtoachievehighMTTF. 3. Althoughsupplyvoltagescanrangeupto450Vtheinputpinscannotswingoverthisrange.The inputpinsmustbeatleast30Vfromeithersupplyrailbutnotmorethan500Vfromeithersupplyrail. Seetextforamorecompletedescriptionofthecommonmodevoltagerange. 4. Ratingappliesiftheoutputcurrentalternatesbetweenbothoutputtransistorsataratefasterthan 60Hz. 5. Deratemaxsupplyrating.625V/Cbelow25Ccase.Noderatingneededabove25Ccase. Piezopositioningmaybeappliedtothefocusingofsegmented mirror systems. The composite mirror may be composedofhundredsofelements,eachrequiringfocusingundercomputercontrol.Insuchcomplexsystemsthe PA95 reduces the costs of power supplies and cooling withitsadvantagesoflowcostandlowquiescentpower consumptionwhileincreasingcircuitdensitywiththeSIP package. TYPICAL APPLICATION PA95U PA95 P r o d u c t I n n o v a t i o nF r o m PHASE COMPENSATION CCratedforfullsupplyvoltage. GAIN 100 CC 4.7pF RLIM= .7 ILIM PA95U P r o d u c t I n n o v a t i o nF r o m PA95 PleasereadApplicationNote1"GeneralOperatingConsiderations"whichcoversstability,supplies,heatsinking, mounting,currentlimit,SOAinterpretation,andspecificationinterpretation.Visitwww.cirrus.comfordesigntools thathelpautomatetaskssuchascalculationsforstability,internalpowerdissipation,currentlimit;heatsinkselection;Apex'scompleteApplicationNoteslibrary;TechnicalSeminarWorkbook;andEvaluationKits. Forproperoperation,thecurrentlimitresistor(RLIM)mustbeconnectedasshownintheexternalconnectiondiagram.Theminimumvalueis3.5ohm,howeverforoptimumreliabilitytheresistorvalueshouldbesetashighas possible.Thevalueiscalculatedasfollows;withthemaximumpracticalvalueof150ohms. .7 RLIM= ILIM Operationalamplifiersareusuallydesignedtohaveacommonmodeinputvoltagerangethatapproximatesthe powersupplyvoltagerange.However,tokeepthecostaslowaspossibleandstillmeettherequirementsofmost applicationsthecommonmodeinputvoltagerangeofthePA95isrestricted.Theinputpinsmustalwaysbealeast 30Vfromeithersupplyvoltagebutnevermorethan500V.ThismeansthatthePA95cannotbeusedinapplications wherethesupplyvoltagesareextremelyunbalanced.Forexample,supplyvoltagesof+800Vand-100Vwouldnot beallowedinanapplicationwherethenon-invertingpinisgroundedbecauseinnormaloperationbothinputpins wouldbeat0Vandthedifferencevoltagebetweenthepositivesupplyandtheinputpinswouldbe800V.Inthis kindofapplication,however,supplyvoltages+500Vand-100Vdoesmeettheinputcommonmodevoltagerange requirementssincethemaximumdifferencevoltagebetweentheinputspinsandthesupplyvoltageis500V(the maximumallowed).Theoutputhasnosuchrestrictionsonitsvoltageswing.Theoutputcanswingwithin24Vof eithersupplyvoltageregardlessofvaluesolongasthetotalsupplyvoltagedoesnotexceed900V. AlthoughthePA95canwithstanddifferentialinputvoltagesupto FIGURE 1. OVERVOLTAGE PROTECTION 20V,additionalexternalprotectionisrecommended.Inmostapplications1N4148or1N914signaldiodesaresufficient(D1,D2in Figure1a).Inmoredemandingapplicationswherelowleakageor lowcapacitanceareofconcern2N4416or2N5457-2N5459JFETs connected as diodes will be required (Q1, Q2 in Figure 1b). In eithercasetheinputdifferentialvoltagewillbeclampedto.7V. Thisissufficientoverdrivetoproducemaximumpowerbandwidth. Notethatthisprotectiondoesnotautomaticallyprotecttheamplifierfromexcessivecommonmodeinputvoltages. Unidirectionalzenerdiodetransientsuppressorsarerecommendedasprotectiononthesupplypins.Thezenersclamptransients tovoltageswithinthepowersupplyratingandalsoclamppower supplyreversalstoground.Whetherthezenersareusedornot, thesystempowersupplyshouldbeevaluatedfortransientperformanceincludingpower-onovershootandpower-offpolarityreversalaswellaslineregulation. Conditionswhichcancauseopencircuitsorpolarityreversalson either power supply rail should be avoided or protected against. Reversalsoropensonthenegativesupplyrailisknowntoinduceinputstagefailure.Unidirectionaltranszorbspreventthis,anditisdesirablethattheybebothelectricallyandphysicallyasclosetotheamplifieraspossible. GENERAL CURRENT LIMIT COMMON MODE INPUT RANGE INPUT PROTECTION POWER SUPPLY PROTECTION PA95U 5 PA95 STAbILITY P r o d u c t I n n o v a t i o nF r o m ThePA95isstableatgainsof10ormorewithaNPO(COG)compensationcapacitorof4.7pF.Thecompensation capacitor,Cc,intheexternalconnectionsdiagrammustberatedat1000Vworkingvoltageandmountedcloselyto pins4and6topreventspuriousoscillation.Acompensationcapacitorlessthan4.7pFisnotrecommended. ThecompensationcapacitorCcmustberatedforthetotalsupplyvoltage.AnNPO(COG)capacitorrateda1kVis recommended. Ofequalimportancearethevoltageratingandvoltagecoefficientofthegainsettingfeedbackresistor.Typicalvoltageratingsoflowwattageresistorsare150to250V.Upto500Vcanappearacrossthefeedbackresistor.High voltageratedresistorscanbeobtained.Howevera1megohmfeedbackresistorcomposedoffive200kresistorsin serieswillproducethepropervoltagerating. TheoperatingvoltagesofthePA95arepotentiallylethal.Duringcircuitdesigndevelopafunctioningcircuitatthe lowestpossiblevoltages.Cliptestleadsshouldbeusedfor"handsoff"measurementswhiletroubleshooting. EXTERNAL COMPONENTS CAUTIONS CONTACTING CIRRUS LOGIC SUPPORT 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. PA95U |
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