PA90
PA90U 1
Product
Technology
F r o m
PA90
FEATURES
♦ HIGHVOLTAGE—400V(±200V)
♦ LOWQUIESCENTCURRENT—10mA
♦ HIGHOUTPUTCURRENT—200mA
♦ PROGRAMMABLECURRENTLIMIT
♦ HIGHSLEWRATE—300V/µs
APPLICATIONS
♦ PIEZOELECTRICPOSITIONING
♦ HIGHVOLTAGEINSTRUMENTATION
♦ ELECTROSTATICTRANSDUCERS
♦ PROGRAMMABLEPOWERSUPPLIESUP
TO390V
Q1 Q2
R1 R2 C1 R3
Q3
CC1
12
11
1
4
5
9
6
10
2
7
8
CC2
3
Q6
Q5
R5
R8 R9
Q15
R11 R12
Q16
Q12
Q8
R4
R7
Q4
ILIM
OUT
Q17
R10
Q13
Q11
+VS
–IN
+IN
–VS
IQ
R6
Q14BQ14A
High Voltage Power Operational Amplifiers
PA90
Product Innovation From
DESCRIPTION
The PA90 is a high voltage, low quiescent current
MOSFEToperationalamplierdesignedasalowcost
solution for driving continuous output currents up to
200mAandpulsecurrentsupto350mA.Thesafeoper-
atingarea(SOA)hasnosecondbreakdownlimitations
and can be observed for all type loads by choosing
anappropriatecurrentlimitingresistor.TheMOSFET
outputstage isbiasedABfor linear operation. Exter-
nalcompensationprovidesexibilityinchoosingband-
width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12-
pinPowerSIPpackageiselectricallyisolated.
EQUIVALENT SCHEMATIC
Copyright © Cirrus Logic, Inc. 2011
(All Rights Reserved)
www.cirrus.com
JAN2011
APEX − PA90UREVL
1 2 3 4 5 6 7 8 9 10
–IN +IN
RCL
+Vs
–Vs
TO LOAD
AND FEEDBACK
11 12
RcCc
*
*
(See text.)
* Bypassing required.
I
Q
12-pin SIP
PACKAGE
STYLE DP
Formedleadsavailable
SeepackageEE
EXTERNAL CONNECTIONS
PA90
2 PA90U
Product
Technology
F r o m
CAUTION ThePA90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 350 mA
POWERDISSIPATION,continuous@TC=25°C 30 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
AMPLIFIER INPUT
OFFSETVOLTAGE,initial 0.5 2 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bandwidth,RS=1KΩ,
CC=OPEN
1 µVRMS
GAIN
OPENLOOP@15Hz RL=2KΩ,CC=OPEN 94 111 dB
GAINBANDWIDTHPRODUCT@1MHz RL=2KΩ,CC=OPEN 100 MHz
POWERBANDWIDTH RL=2KΩ,CC=OPEN 470 kHz
PHASEMARGIN Fulltemperaturerange 60 °
OUTPUT
VOLTAGESWING(Note3) IO=200mA ±VSŦ12 ±VSŦ10 V
CURRENT,continuous 200 mA
SLEWRATE,AV=100 CC=OPEN 240 300 V/µS
CAPACITIVELOAD,AV=+1 Fulltemperaturerange 470 pF
SPECIFICATIONS
PA90
PA90U 3
Product
Technology
F r o m
NOTES: 1. (AllMin/MaxcharacteristicsandspecicationsareguaranteedovertheSpeciedOperatingCondi-
tions.Typicalperformancecharacteristicsandspecicationsarederivedfrommeasurementstaken
attypicalsupplyvoltagesandTC=25°C).
2. Longtermoperationatthemaximumjunctiontemperaturewillresultinreducedproductlife.Derate
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=OPEN,2Vstep 1 µS
RESISTANCE,noload 50 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 2.5 °C/W
RESISTANCE,DC,junctiontocase Fulltemprange,F<60Hz 4.2 °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segment-
edmirrorsystems.Thecompositemirrormaybecomposed
ofhundredsofelements,eachrequiringfocusingundercom-
puter control. In such complex systems the PA90 reduces
thecostsofpowersuppliesandcoolingwithitsadvantages
oflowcostandlowquiescentpowerconsumptionwhilein-
creasingcircuitdensitywiththeSIPpackage.
TYPICAL PERFORMANCE GRAPHS
F
R
PA90
IN
R1
2
6
7,8
9,10
11,12
PIEZO DRIVE
S
–V
S
+V
OUT
V
COMPUTER
FOCUS
COMMAND
VOLTAGE
CL
R
10
HARMONIC DISTORTION
100K100 1K 10K
100k
FREQUENCY F (Hz)
135
90
PHASE RESPONSE
PHASE, Ф (°)
10 100 10K 100K
FREQUENCY, F (Hz)
INPUT NOISE VOLTAGE, V (nV√Hz)
100K
FREQUENCY, F (Hz)
–10
0
30
SMALL SIGNAL RESPONSE
OPEN LOOP GAIN, A (dB)
10
20
40
50
0 0.15 0.2
OUTPUT CURRENT, I
O
(A)
5
6
OUTPUT VOLTAGE SWING
4.5
4
5.5
1M
FREQUENCY, F (Hz)
50
OUTPUT VOLTAGE, V
O
(V
P-P
)
200
100
80
70
60
400
300
0 8 12 20 24
RESISTOR VALUE, R
CL
(Ω)
0
.05
.2
CURRENT LIMIT
CURRENT LIMIT, I
LIM
(A)
.1
.15
0.1
EXT. COMPENSATION CAPACITOR, C
C
(pF)
10
SLEW RATE
SLEW RATE, (V/μS)
50
40
30
20
1K
10 100
FREQUENCY, F (Hz)
DISTORTION, (%)
1
25 50 100
CASE TEMPERATURE, T
C
(°C)
1.1
NORMALIZED QUIES. CURRENT
NORMALIZED QUIESCENT CURRENT, I
Q
(X)
1.0
4 16
INPUT NOISE VOLTAGE
1K
2
7
10
20
5
3
15
.05
VOLTAGE DROP FROM SUPPLY, V
S
– V
O
(V)
225
POWER RESPONSE
75
.001
1M 10M
270
180
125
1.2
1.3
0.1
3.5
100K
700
300
200
100
70
500
1
.01
.1
10K
1M 10M
C
C
= 68 pF
C
C
= 10 pF
C
C
= 4.7 pF
C
C
= OPEN
C
C
= 68 pF
C
C
= 10 pF
C
C
= 4.7 pF
C
C
= OPEN
C
C
= OPEN
C
C
= 4.7pF
C
C
= 10pF
C
C
= 68pF
0 25 50 75 100 125 150
CASE TEMPERATURE, T
C
(°C)
0
8
24
32
POWER DERATING
INTERNAL POWER DISSIPATION, P(W)
16
40
R
L
= 1KΩ
V
S
= 200V
A
V
= 63
P
O
= 5W
P
O
= 1W
P
O
= 17.6W
PA90
4 PA90U
Product
Technology
F r o m
10
HARMONIC DISTORTION
100K100 1K 10K
100k
FREQUENCY F (Hz)
135
90
PHASE RESPONSE
PHASE, Ф (°)
10 100 10K 100K
FREQUENCY, F (Hz)
INPUT NOISE VOLTAGE, V (nV√Hz)
100K
FREQUENCY, F (Hz)
–10
0
30
SMALL SIGNAL RESPONSE
OPEN LOOP GAIN, A (dB)
10
20
40
50
0 0.15 0.2
OUTPUT CURRENT, I
O
(A)
5
6
OUTPUT VOLTAGE SWING
4.5
4
5.5
1M
FREQUENCY, F (Hz)
50
OUTPUT VOLTAGE, V
O
(V
P-P
)
200
100
80
70
60
400
300
0 8 12 20 24
RESISTOR VALUE, R
CL
(Ω)
0
.05
.2
CURRENT LIMIT
CURRENT LIMIT, I
LIM
(A)
.1
.15
0.1
EXT. COMPENSATION CAPACITOR, C
C
(pF)
10
SLEW RATE
SLEW RATE, (V/μS)
50
40
30
20
1K
10 100
FREQUENCY, F (Hz)
DISTORTION, (%)
1
25 50 100
CASE TEMPERATURE, T
C
(°C)
1.1
NORMALIZED QUIES. CURRENT
NORMALIZED QUIESCENT CURRENT, I
Q
(X)
1.0
4 16
INPUT NOISE VOLTAGE
1K
2
7
10
20
5
3
15
.05
VOLTAGE DROP FROM SUPPLY, V
S
– V
O
(V)
225
POWER RESPONSE
75
.001
1M 10M
270
180
125
1.2
1.3
0.1
3.5
100K
700
300
200
100
70
500
1
.01
.1
10K
1M 10M
C
C
= 68 pF
C
C
= 10 pF
C
C
= 4.7 pF
C
C
= OPEN
C
C
= 68 pF
C
C
= 10 pF
C
C
= 4.7 pF
C
C
= OPEN
C
C
= OPEN
C
C
= 4.7pF
C
C
= 10pF
C
C
= 68pF
0 25 50 75 100 125 150
CASE TEMPERATURE, T
C
(°C)
0
8
24
32
POWER DERATING
INTERNAL POWER DISSIPATION, P(W)
16
40
R
L
= 1KΩ
V
S
= 200V
A
V
= 63
P
O
= 5W
P
O
= 1W
P
O
= 17.6W
PHASE COMPENSATION
GAIN CC* RC
≥1 68pF 100Ω
≥5 10pF 100Ω
≥10 4.7pF 0Ω
≥30 NONE 0Ω
*CCToberatedforthefullsupplyvoltage+VSto–VS.
UseNPOceramic(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fol-
lows;withthemaximumpracticalvalueof32ohms.
.65
RCL=
ILIM
PA90
PA90U 5
Product
Technology
F r o m
SAFE OPERATING AREA (SOA)
TheMOSFEToutputstageofthispoweroperationalamplierhastwodistinctlimitations:
1. ThecurrenthandlingcapabilityoftheMOSFETgeometry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en-
ergy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PA90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 Fig-
ure2).Thedifferential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regulation.
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PA90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CCRCmustbemountedcloselytotheampli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raisesdistortionsince
theoutputstageisthenclassCbiased,butreducesthequiescentcurrentby1mAforapowerdissipationsavings
of0.4W.Pin3maybeleftopenifnotused.
SOA
SUPPLY TO OUTPUT DIFFERENTIAL, V
S
- V
O
(V)
OUTPUT CURRENT FROM +V
S
OR -V
S
(mA)
25 50 75 100 125 250 500
500
300
200
100
50
30
20
10
PULSE CURVES @ 10% DUTY CYCLE MAX.
100mS
200mS DC, TC = 25°C
DC, TC = 125°C
DC, TC = 85°C
+VS
–IN
+IN
Z1
Z2
11, 12
7, 8
1
2
6
PA90
Q1
Q2
–VS
Q3
Q4
FIGURE 2.
OVERVOLTAGE
PROTECTION
PA90
6 PA90U
Product
Technology
F r o m
CONTACTING CIRRUS LOGIC SUPPORT
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