APEX PA89

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FEATURES
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1140V P-P SIGNAL OUTPUT
WIDE SUPPLY RANGE — ±75V to ±600V
PROGRAMMABLE CURRENT LIMIT
75 mA CONTINUOUS OUTPUT CURRENT
HERMETIC SEALED PACKAGE
INPUT PROTECTION
PATENTED
APPLICATIONS
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PIEZOELECTRIC POSITIONING
HIGH VOLTAGE INSTRUMENTATION
ELECTROSTATIC DEFLECTION
SEMICONDUCTOR TESTING
TYPICAL APPLICATION
Ultra-high voltage capability combined with the bridge amplifier configuration makes it possible to develop +/–1000 volt
peak swings across a piezo element. A high gain of –50 for
A1 insures stability with the capacitive load, while “noise-gain”
compensation Rn and Cn on A2 insure the stability of A2 by
operating in a noise gain of 50.
DESCRIPTION
The PA89 is an ultra high voltage, MOSFET operational
amplifier designed for output currents up to 75 mA. Output
voltages can swing over 1000V p-p. The safe operating area
(SOA) has no second breakdown limitations and can be
observed with all types of loads by choosing an appropriate
current limiting resistor. High accuracy is achieved with a
cascode input circuit configuration and 120dB open loop gain.
All internal biasing is referenced to a bootstrapped zenerMOSFET current source, giving the PA89 a wide supply range
and excellent supply rejection. The MOSFET output stage is
biased for class A/B linear operation. External compensation
provides user flexibility. The PA89 is 100% gross leak tested
to military standards for long term reliability.
This hybrid integrated circuit utilizes a beryllia (BeO) substrate, thick film resistors, ceramic capacitors and semiconductor chips to maximize reliability, minimize size and give top
performance. Ultrasonically bonded aluminum wires provide
reliable interconnections at all operating temperatures. The
MO-127 High Voltage, Power Dip™ package is hermetically
sealed and electrically isolated. The use of compressible
thermal washers will void the product warranty.
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EXTERNAL CONNECTIONS
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SIMPLIFIED SCHEMATIC
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HIGH VOLTAGE MO-127
PACKAGE STYLE DC
PHASE COMPENSATION
Gain
1
10
15
100
CC
470pF
68pF
33pF
15pF
RC
470Ω
220Ω
220Ω
220Ω
Note: CC must be rated for full supply voltage –Vs to +Vs.
See details under “EXTERNAL COMPONENTS”.
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
1
PA89 • PA89A
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
SUPPLY VOLTAGE, +VS to –VS
OUTPUT CURRENT, within SOA
POWER DISSIPATION, internal at TC = 25°C
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
TEMPERATURE, pin solder - 10s max
TEMPERATURE, junction2
TEMPERATURE, storage
OPERATING TEMPERATURE RANGE, case
SPECIFICATIONS
PARAMETER
TEST CONDITIONS 1
MIN
PA89
TYP
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
OFFSET VOLTAGE, vs. supply
OFFSET VOLTAGE, vs. time
BIAS CURRENT, initial3
BIAS CURRENT,vs. supply
OFFSET CURRENT, initial3
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
COMMON MODE VOLTAGE RANGE4
COMMON MODE REJECTION, DC
INPUT NOISE
Full temperature range
±VS 50
Full temperature range, VCM = ±90V
96
10kHz BW, RS = 10K, CC = 15pF
110
4
GAIN
OPEN LOOP GAIN at 10Hz
GAIN BANDWIDTH PRODUCT
POWER BANDWIDTH
PHASE MARGIN
RL = 10k, CC = 15pF
RL = 10k, CC = 15pF, AV = 100
RL = 10k, CC = 15pF, VO = 500V p-p
Full temperature range, AV = 10
120
10
5
60
OUTPUT
VOLTAGE SWING4
VOLTAGE SWING4
CURRENT, continuous
SLEW RATE
CAPACITIVE LOAD, Av = 10
CAPACITIVE LOAD, Av>10
SETTLING TIME to .1%
IO = 75mA
Full temperature range, IO = 20mA
Full temperature range
CC = 15pF, AV = 100
Full temperature range
Full temperature range
RL = 10KΩ, 10V step, Av = 10
Full temperature range, F > 60Hz
Full temperature range, F < 60Hz
Full temperature range
Meets full range specifications
±VS 45 ±VS 30
±VS 20 ±VS 12
75
12
16
±
±
Full temperature range
108
.5
10
7
75
5
.01
5
105
4
2
±75
–25
MAX
MIN
2
30
50
50
*
*
±
±
THERMAL
RESISTANCE, AC, junction to case5
RESISTANCE, DC, junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
±
POWER SUPPLY
VOLTAGE, VS4
CURRENT, quiescent
Full temperature range
1200V
100mA
40W
±25V
±VS 25V
300°C
150°C
–65 to 125°C
–55 to 125°C
±
ABSOLUTE MAXIMUM RATINGS
1
SOA
±500
4.8
±600
6.0
2.1
3.3
15
2.3
3.5
+85
PA89A
TYP
.25
5
*
*
3
*
3
*
*
MAX
UNITS
.5
10
mV
µV/°C
µV/V
µV/kh
pA
pA/V
pA
MΩ
pF
V
dB
µV RMS
10
20
*
*
*
*
*
*
dB
MHz
kHz
°
*
*
*
*
*
*
V
V
mA
V/µs
nF
*
*
*
*
*
*
µs
*
*
*
*
V
mA
*
*
*
*
*
°C/W
°C/W
°C/W
°C
*
NOTES: * The specification of PA89A is identical to the specification for PA89 in applicable column to the left.
1. Unless otherwise noted: TC = 25°C, CC = 68pF, RC = 220Ω, and VS = ±500V. Input parameters for bias currents and offset voltage are ± values given.
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to
achieve high MTTF.
3. Doubles for every 10°C of temperature increase.
4. +VS and –VS denote the positive and negative supply rail respectively.
5. Rating applies only if the output current alternates between both output transistors at a rate faster than 60Hz.
CAUTION
The PA89 is constructed from MOSFET transistors. ESD handling procedures must be observed.
The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or
subject to temperatures in excess of 850°C to avoid generating toxic fumes.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
2
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TYPICAL PERFORMANCE
GRAPHS
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PA89 • PA89A
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
3
PA89 • PA89A
OPERATING
CONSIDERATIONS
GENERAL
Please read Application Note 1 "General Operating Considerations" which covers stability, supplies, heat sinking,
mounting, current limit, SOA interpretation, and specification
interpretation. Visit www.apexmicrotech.com for design tools
that help automate tasks such as calculations for stability,
internal power dissipation, current limit; heat sink selection;
Apex’s complete Application Notes library; Technical Seminar
Workbook; and Evaluation Kits.
STABILITY
Although the PA89 can be operated at unity gain, maximum
slew rate and bandwidth performance was designed to be
obtained at gains of 10 or more. Use the small signal response
and phase response graphs as a guide. In applications where
gains of less than 10 are required, use noise gain compensation to increase the phase margin of the application circuit as
illustrated in the typical application drawing.
SAFE OPERATING AREA (SOA)
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The MOSFET output stage of this power operational amplifier 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 flyback.
However, for protection against sustained, high energy flyback,
external fast-recovery diodes should be used.
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cern in building op amp circuits: voltage rating and voltage
coefficient.
The compensation capacitance CC must be rated for the
full supply voltage range. For example, with supply voltages
of ±500V the possible voltage swing across CC is 1000V. In
addition, a voltage coefficient less than 100PPM is recommended to maintain the capacitance variation to less than
5% for this example. It is strongly recommended to use the
highest quality capacitor possible rated at least twice the total
supply voltage range.
Of equal importance are the voltage rating and voltage coefficient of the gain setting resistances. Typical voltage ratings of
low wattage resistors are 150 to 250V. In the above example
1000V could appear across the feedback resistor. This would
require several resistors in series to obtain the proper voltage
rating. Low voltage coefficient resistors will insure good gain
linearity. The wattage rating of the feedback resistor is also of
concern. A 1 megohm feedback resistor could easily develop
1 watt of power dissipation.
Though high voltage rated resistors can be obtained,
a 1 megohm feedback resistor comprised of five 200Kohm,
1/4 watt metal film resistors in series will produce the proper
voltage rating, voltage coefficient and wattage rating.
CURRENT LIMIT
For proper operation the current limit resistor (RCL) 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 of
150 ohms.
.7
RCL =
ILIM
When setting the value for RCL allow for the load current as
well as the current in the feedback resistor. Also allow for the
temperature coefficient of the current limit which is approximately -0.3% /°C of case temperature rise.
CAUTIONS
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The operating voltages of the PA89 are potentially lethal.
During circuit design, develop a functioning circuit at the lowest
possible voltages. Clip test leads should be used for “hands
off” measurements while troubleshooting.
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POWER SUPPLY PROTECTION
SAFE OPERATING CURVES
The safe operating area curves define the maximum additional internal power dissipation the amplifier can tolerate
when it produces the necessary output to drive an external
load. This is not the same as the absolute maximum internal
power dissipation listed elsewhere in the specification since
the quiescent power dissipation is significant compared to
the total.
EXTERNAL COMPONENTS
The very high operating voltages of the PA89 demand
consideration of two component specifications rarely of con-
Unidirectional zener diode transient absorbers are recommended as protection on the supply pins. 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 amplifier as possible.
This data
sheet has been carefullyCORPORATION
checked and is believed
to be NORTH
reliable, however,
no responsibility
is assumed for
possible inaccuracies
omissions.
All specificationsHOTLINE:
are subject to1change
notice.
APEX
MICROTECHNOLOGY
• 5980
SHANNON
ROAD • TUCSON,
ARIZONA
85741 •orUSA
• APPLICATIONS
(800)without
546-2739
4
PA89U REV H MAY 2005
© 2005 Apex Microtechnology Corp.