PA93
PA93U 1
Product
Technology
F r o m
PA93
FEATURES
♦ HIGHVOLTAGE—400V(±200V)
♦ LOWQUIESCENTCURRENT—10mA
♦ HIGHOUTPUTCURRENT—8A
♦ PROGRAMMABLECURRENTLIMIT
APPLICATIONS
♦ PIEZOELECTRICPOSITIONING
♦ HIGHVOLTAGEINSTRUMENTATION
♦ ELECTROSTATICTRANSDUCERS
♦ PROGRAMMABLEPOWERSUPPLIESUP
TO390V
Q1 Q2
R1A R1B C1 R3
Q3
CC1
CC2
Q6
Q5
R5
R8 R9
Q15
R11 R12
Q16
Q12
Q8
R4
R7
Q4
ILIM
OUT
Q18
R15
Q13
Q11
+V
S
–IN
+IN
–V
S
R6
Q14A Q14B
High Voltage Power Operational Amplifiers
PA93
Product Innovation From
DESCRIPTION
The PA93 is a high voltage, low quiescent current
MOSFEToperationalamplierdesignedasalowcost
solutionfordrivingcontinuousoutputcurrentsupto8A
andpulsecurrentsupto14A.Thesafeoperatingarea
(SOA)hasnosecondbreakdownlimitationsandcan
beobservedforalltypeloadsbychoosinganappropri-
atecurrentlimitingresistor.TheMOSFEToutputstage
isbiasedABforlinearoperation.Externalcompensa-
tionprovidesexibilityinchoosingbandwidthandslew
ratefortheapplication.ApexPrecisionPower’sPower
SIPpackageusesaminimumofboardspaceallowing
forhighdensitycircuitboards.ThePowerSIPpackage
iselectricallyisolated.
EQUIVALENT SCHEMATIC
Copyright © Cirrus Logic, Inc. 2011
(All Rights Reserved)
www.cirrus.com
JAN 2011
APEX − PA93UREVK
1 2 3 4 5 6 7 8 9 10
–IN +IN
RCL
+Vs
–Vs
TO LOAD
AND FEEDBACK
(See text.)
11 12
RcCc
*
*
* Bypassing required.
IQ
EXTERNAL CONNECTIONS
PATENTED
12-pin SIP
PACKAGE
STYLE DP
Formedleadsavailable
SeepackagestyleEE
PA93
2 PA93U
Product
Technology
F r o m
SPECIFICATIONS
CAUTION ThePA93isconstructedfromMOSFETtransistors.ESDhandlingproceduresmustbeobserved.
Theexposedsubstratecontainsberyllia(BeO).Donotcrush,machine,orsubjecttotemperatures
inexcessof850°Ctoavoidgeneratingtoxicfumes.
Parameter Symbol Min Max Units
SUPPLYVOLTAGE,+VSto-VS400 V
OUTPUTCURRENT,source,sink,peak,withinSOA 14 A
POWERDISSIPATION,continuous@TC=25ºC 125 W
INPUTVOLTAGE,differential -20 20 V
INPUTVOLTAGE,commonmode -VSVSV
TEMPERATURE,pinsolder,10smax. 260 °C
TEMPERATURE,junction(Note2) 150 °C
TEMPERATURERANGE,storage −40 85 °C
OPERATINGTEMPERATURERANGE,case −25 85 °C
1. CHARACTERISTICS AND SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Parameter Test Conditions1Min Typ Max Units
INPUT
OFFSETVOLTAGE,initial 2 10 mV
OFFSETVOLTAGEvs.temperature Fulltemperaturerange 15 50 µV/°C
OFFSETVOLTAGEvs.supply 10 25 µV/V
OFFSETVOLTAGEvs.time 75 µV/kHz
BIASCURRENT,initial 200 2000 pA
BIASCURRENTvs.supply 4 pA/V
OFFSETCURRENT,initial 50 500 pA
INPUTIMPEDANCE,DC 1011 Ω
INPUTCAPACITANCE 4 pF
COMMONMODEVOLTAGERANGE
(Note3)
±VsŦ15 V
COMMONMODEREJECTION,DC VCM=±90V 80 98 dB
NOISE 100KHzBW,RS=1KΩ,
CC=10pF
1 µVRMS
GAIN
OPENLOOP@15Hz RL=2KΩ,CC=10pF 94 111 dB
GAINBANDWIDTHPRODUCT@1MHz RL=2KΩ,CC=10pF 12 MHz
POWERBANDWIDTH RL=2KΩ,CC=10pF 30 KHz
PHASEMARGIN Fulltemprange 60 °
OUTPUT
VOLTAGESWING(Note3) IO=8mA ±VSŦ12 ±VSŦ10 V
CURRENT,continuous 8 A
SLEWRATE,AV=100 CC=10pF 50 V/µS
CAPACITIVELOAD,AV=+1 Fulltemprange 1 nF
PA93
PA93U 3
Product
Technology
F r o m
NOTES: 1. Unlessotherwisenoted:TC=25°C,DCinputspecicationsare±valuegiven.Powersupplyvoltage
istypicalrating.RC=100CC=220pF.
2. Longtermoperationatthemaximumjunctiontemperaturewillresultinreducedproductlife.Derate
internalpowerdissipationtoachievehighMTTF.
3. +VSand–VSdenotethepositiveandnegativepowersupplyrailrespectively.
4. Ratingappliesiftheoutputcurrentalternatesbetweenbothoutputtransistorsataratefasterthan
60Hz.
5. Deratemaxsupplyrating.625V/°Cbelow25°Ccase.Noderatingneededabove25°Ccase.
Parameter Test Conditions1Min Typ Max Units
SETTLINGTIMEto0.1% CC=10pF,2Vstep 1 µS
RESISTANCE,noload 10 Ω
POWER SUPPLY
VOLTAGE(Note5) ±40 ±150 ±200 V
CURRENT,quiescent 10 14 mA
THERMAL
RESISTANCE,AC,junctiontocase
(Note4)
Fulltemprange,F>60Hz 0.7 °C/W
RESISTANCE,DC,junctiontocase Fulltemprange,F<60Hz 1 °C/W
RESISTANCE,junctiontoair Fulltemprange 30 °C/W
TEMPERATURERANGE,case Meetsfullrangespecications -25 +85 °C
TYPICAL APPLICATION
LOW POWER, PIEZOELECTRIC POSITIONING
Piezopositioningmaybeappliedtothefocusingofsegmented
mirror systems. The composite mirror may be composed of
hundredsofelements,eachrequiringfocusingundercomputer
control.InsuchcomplexsystemsthePA93reducesthecosts
ofpowersuppliesandcoolingwithitsadvantagesoflowcost
andlowquiescentpowerconsumptionwhileincreasingcircuit
densitywiththeSIPpackage.
TYPICAL PERFORMANCE GRAPHS
F
R
PA93
IN
R1
2
6
7,8
9,10
11,12
PIEZO DRIVE
S
–V
S
+V
OUT
V
COMPUTER
FOCUS
COMMAND
VOLTAGE
CL
R
0 25 50 75 100 125
CASE TEMPERATURE, T
C
(°C)
0
75
100
POWER DERATING
INTERNAL POWER DISSIPATION
100k
FREQUENCY F (Hz)
135
90
PHASE RESPONSE
PHASE, Ф (°)
100K
FREQUENCY, F (Hz)
–10
0
30
SMALL SIGNAL RESPONSE
OPEN LOOP GAIN, A (dB)
10
20
40
50
0 6 8
OUTPUT CURRENT, I
O
(A)
7
9
OUTPUT VOLTAGE SWING
6
8
1M
FREQUENCY, F (Hz)
10
OUTPUT VOLTAGE, V
O
(V
P-P
)
100
400
0 .2 .3 .5 .6
RESISTOR VALUE, R
CL
(Ω)
0
2
8
CURRENT LIMIT
CURRENT LIMIT, I
LIM
(A)
4
6
10 60
EXT. COMPENSATION CAPACITOR, C
C
(pF)
1
SLEW RATE
SLEW RATE, (V/μS)
4
3
2
60
100 200 30020 40
25 50 100
CASE TEMPERATURE, T
C
(°C)
1.2
NORMALIZED QUIES. CURRENT
NORMALIZED QUIESCENT CURRENT, I
Q
(X)
1.0
.1 .4
2
VOLTAGE DROP FROM SUPPLY, V
S
– V
O
(V)
225
50
25
125
POWER RESPONSE
75
1M 10M
270
180
125
1.4
1.8
1.6
4
5
100K
40
20
10
8
6
30
30
1K 10K
1M 10M
C
C
= 220pF
C
C
= 100pF
C
C
= 47pF
C
C
= 10pF
FREQUENCY, F (Hz)
INPUT NOISE VOLTAGE, V
N
(nV√Hz)
FREQUENCY, F (Hz)
HARMONIC DISTORTION
DISTORTION, (%)
.01
.1
10K
100 1K
INPUT NOISE VOLTAGE
2
7
10
20
5
3
15
.001
P
O
= 1W
P
O
= 20W
P
O
= 62W
C
C
= 220pF
C
C
= 100pF
C
C
= 47pF
C
C
= 10pF
C
C
= 220pF
C
C
= 100pF
C
C
= 47pF
C
C
= 10pF
10 100K10K1K100
PA93
4 PA93U
Product
Technology
F r o m
0 25 50 75 100 125
CASE TEMPERATURE, T
C
(°C)
0
75
100
POWER DERATING
INTERNAL POWER DISSIPATION
100k
FREQUENCY F (Hz)
135
90
PHASE RESPONSE
PHASE, Ф (°)
100K
FREQUENCY, F (Hz)
–10
0
30
SMALL SIGNAL RESPONSE
OPEN LOOP GAIN, A (dB)
10
20
40
50
0 6 8
OUTPUT CURRENT, I
O
(A)
7
9
OUTPUT VOLTAGE SWING
6
8
1M
FREQUENCY, F (Hz)
10
OUTPUT VOLTAGE, V
O
(V
P-P
)
100
400
0 .2 .3 .5 .6
RESISTOR VALUE, R
CL
(Ω)
0
2
8
CURRENT LIMIT
CURRENT LIMIT, I
LIM
(A)
4
6
10 60
EXT. COMPENSATION CAPACITOR, C
C
(pF)
1
SLEW RATE
SLEW RATE, (V/μS)
4
3
2
60
100 200 30020 40
25 50 100
CASE TEMPERATURE, T
C
(°C)
1.2
NORMALIZED QUIES. CURRENT
NORMALIZED QUIESCENT CURRENT, I
Q
(X)
1.0
.1 .4
2
VOLTAGE DROP FROM SUPPLY, V
S
– V
O
(V)
225
50
25
125
POWER RESPONSE
75
1M 10M
270
180
125
1.4
1.8
1.6
4
5
100K
40
20
10
8
6
30
30
1K 10K
1M 10M
C
C
= 220pF
C
C
= 100pF
C
C
= 47pF
C
C
= 10pF
FREQUENCY, F (Hz)
INPUT NOISE VOLTAGE, V
N
(nV√Hz)
FREQUENCY, F (Hz)
HARMONIC DISTORTION
DISTORTION, (%)
.01
.1
10K
100 1K
INPUT NOISE VOLTAGE
2
7
10
20
5
3
15
.001
P
O
= 1W
P
O
= 20W
P
O
= 62W
C
C
= 220pF
C
C
= 100pF
C
C
= 47pF
C
C
= 10pF
C
C
= 220pF
C
C
= 100pF
C
C
= 47pF
C
C
= 10pF
10 100K10K1K100
PHASE COMPENSATION
GAIN CC* RC
≥1 220pF 100Ω
≥2 100pF 100Ω
≥4 47pF 0Ω
≥17 10pF 0Ω
*CC Nevertobe<10pF.CCtoberatedforthefullsupply
voltage+VSto-VS.UseceramicNPO(COG)type.
GENERAL
PleasereadApplicationNote1"GeneralOperatingConsiderations"whichcoversstability,supplies,heatsinking,
mounting,currentlimit,SOAinterpretation,andspecicationinterpretation.Visitwww.Cirrus.comfordesigntools
thathelpautomatetaskssuchascalculationsforstability,internalpowerdissipation,currentlimit;heatsinkselec-
tion;ApexPrecisionPower’scompleteApplicationNoteslibrary;TechnicalSeminarWorkbook;andEvaluationKits.
CURRENT LIMIT
Forproperoperation,thecurrentlimitresistor(RCL)mustbeconnectedasshownintheexternalconnectiondia-
gram.Foroptimumreliabilitytheresistorvalueshouldbesetashighaspossible.Thevalueiscalculatedasfollows;
withthemaximumpracticalvalueof16ohms.
.65
RCL=
ILIM
PA93
PA93U 5
Product
Technology
F r o m
SAFE OPERATING AREA (SOA)
TheMOSFEToutputstageofthispoweroperationalam-
plierhastwodistinctlimitations:
1. ThecurrenthandlingcapabilityoftheMOSFETgeom-
etryandthewirebonds.
2. ThejunctiontemperatureoftheoutputMOSFETs.
NOTE: The output stage is protected against transient
yback.However,forprotectionagainstsustained,high
energyyback,externalfast-recoverydiodesshouldbe
used.
SAFE OPERATING CURVES
Thesafeoperatingareacurvesdenethemaximumad-
ditionalinternalpowerdissipationtheampliercantoler-
ate when it produces the necessary output to drive an
externalload.
INPUT PROTECTION
AlthoughthePA93canwithstanddifferentialvoltagesup
to±20V,additionalexternalprotectionisrecommended.
Low leakage, low capacitance JFETs connected as di-
odesarerecommended(e.g.2N4416,Q1-Q4inFigure2).Thedifferen-
tialinputvoltagewillbeclampedto±1.4V.Thisissufcientoverdriveto
producemaximumpowerbandwidth.
POWER SUPPLY PROTECTION
Unidirectionalzenerdiodetransientsuppressorsarerecommendedas
protectiononthesupplypins.SeeFigure2.Thezenersclamptransients
tovoltageswithinthepowersupplyratingandalsoclamppowersupply
reversals to ground. Whether the zeners are used or not, the system
power supply should be evaluated for transient performance including
power-onovershootandpower-offpolarityreversalsaswellaslineregu-
lation.
Conditionswhichcancauseopencircuitsorpolarityreversalsoneither
powersupplyrailshouldbeavoidedorprotectedagainst.Reversalsoropensonthenegativesupplyrailisknown
toinduceinputstagefailure.Unidirectionaltranszorbspreventthis,anditisdesirablethattheybebothelectrically
andphysicallyasclosetotheamplieraspossible.
STABILITY
ThePA93isexternallycompensatedandperformancecanbetailoredtotheapplication.Usethegraphsofsmall
signalresponseandpowerresponseasaguide.ThecompensationcapacitorCCmustberatedat500Vworking
voltage.AnNPOcapacitorisrecommended.ThecompensationnetworkCCRCmustbemountedcloselytotheam-
plierpins4and5toavoidspuriousoscillation.
QUIESCENT CURRENT REDUCTION
Whenpin3(IQ)isshortedtopin5(CC2)theABbiasingoftheoutputstageisdisabled.Thislowersquiescentpower
butalsoraisesdistortionsincetheoutputstageisthenclassCbiased.Theoutputstagebiascurrentisnominally
setat1mA.Pin3maybeleftopenifnotused.
SUPPLY TO OUTPUT DIFFERENTIAL, VS – VO (V)
10 20 30 40 100 200 300 500
OUTPUT CURRENT FROM +VS OR –VS, (A)
.1
.08
.06
.6
.4
.3
.2
.8
3
2
1
4
6
8
20
10
DC,T
C
= 125C
100mS
60 80
200mS
DC, TC = 25C
DC,T
C
= 85C
SOA
+VS
–IN
+IN
Z1
Z2
11, 12
7, 8
1
2
6
PA93
Q1
Q2
–VS
Q3
Q4
FIGURE 2.
OVERVOLTAGE
PROTECTION
PA93
6 PA93U
Product
Technology
F r o m
CONTACTING CIRRUS LOGIC SUPPORT
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