CIRRUS PA89

PA89PA89
• PA89A
• PA89A
P r o d u c t IPA89A
Innnnoovvaa t i o n FFr roomm
PA89,
High Voltage Power Operational Amplifiers
FEATURES
• 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
• 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 zener-MOSFET 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.
50R
+600V
D1
Q2
COMP
9
10
–IN
1
Q22
Q23
Q25A
Q25B
Q26
Q29
D34
D35
D31
–600V
EXTERNAL CONNECTIONS
–IN
+IN
PA89U
http://www.cirrus.com
RESERVED
1
12
2
11
N/C
3
N/C
4
–VS
TOP
VIEW
10
8
6
7
–VS
5
+VS
COMP
RC
CL
R CL =
7
6
OUT
RESERVED
CC
COMP
9
5
CL
.7
I
LIM
R CL
PHASE COMPENSATION
Gain
1
10
15
100
Q44
D5
–600V
SINGLE AXIS MICRO-POSITIONING
Q42
Q45
Cn
PIEZO
TRANSDUCER
+IN
2
A2
PA89
OUT
Q20
Q36
D30
R
A1
PA89
V IN
Q19
D57
+600V
R
8
+VS
Q3
50R
50R
SIMPLIFIED SCHEMATIC
Q1
High Voltage MO-127
PACKAGE STYLE DC
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”.
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 20091
APEX − PA89UREVJ
PA89 • PA89A
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
TEST CONDITIONS 1
MIN
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
Full temperature range, VCM = ±90V
10kHz BW, RS = 10K, CC = 15pF
±VS 50
96
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
108
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
.5
10
7
75
5
.01
5
105
4
110
4
120
10
5
60
±VS 45 ±VS 30
±VS 20 ±VS 12
75
12
16
±
±
THERMAL
RESISTANCE, AC, junction to case5
RESISTANCE, DC, junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
Full temperature range
±
POWER SUPPLY
VOLTAGE, VS4
CURRENT, quiescent
Full temperature range
PA89
TYP
±
±
PARAMETER
2
±75
–25
±500
4.8
2.1
3.3
15
1200V
100mA
40W
±25V
±VS 25V
300°C
150°C
–65 to 125°C
–55 to 125°C
±
ABSOLUTE MAXIMUM RATINGS
P r o d u c t I n n o v a t i o nF r o m
PA89A
MAX
MIN TYP
MAX
2
.25
.5
30
5
10
*
*
50
3
10
*
50
3
20
*
*
*
*
*
*
UNITS
mV
µV/°C
µV/V
µV/kh
pA
pA/V
pA
MΩ
pF
V
dB
µV RMS
*
*
*
*
dB
MHz
kHz
°
*
*
*
*
*
*
*
1
*
SOA
*
*
V
V
mA
V/µs
nF
±600
*
6.0
V
mA
*
*
*
*
2.3
*
*
3.5
*
*
*
+85
*
*
µs
°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
2
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.
PA89U
PA89 • PA89A
16
8
68pf, 220Ω
–180
15pf, 220Ω
0
25
50
75 100 125 150
CASE TEMPERATURE, TC (°C)
SMALL SIGNAL RESPONSE
15pf, 220Ω
33pf, 220Ω
80
60
40
68pf, 220Ω
20
0
CC, RC
1
100 1K 10K 100K 1M 10M
FREQUENCY, F (Hz)
10
1
OUTPUT VOLTAGE SWING
30
25
20
15
10
5
0
0
1
VS = ±500V
CC = 15pf, RC = 220Ω
RL = 11KΩ
AV = 100
.1
VO = 800Vpp
80
60
40
20
0
1
PA89U
10
100 1K 10K 100K 1M 10M
FREQUENCY, F (Hz)
100
VO = 600Vpp
VO = 400Vpp
.001
30
POWER SUPPLY REJECTION, PSR (dB)
COMMON MODE REJECTION
100
100
.95
.9
VO = 100Vpp
POWER SUPPLY REJECTION
60
40
20
1
10
0
100 1K 10K 100K 1M 10M
FREQUENCY, F (Hz)
200 400 600 800 1000 1200
TOTAL SUPPLY VOLTAGE, VS (V)
POWER RESPONSE
CC = 15pf
600
500
300
CC = 33pf
CC = 68pf
100
1K
100 300 1K 3K 10K 30K 100K
FREQUENCY, F (Hz)
80
0
1.00
HARMONIC DISTORTION
.01
0
75
25
50.
100
EXT. COMPENSATION CAPACITOR, CC (pF)
25
50
75
OUTPUT CURRENT, IO,(mA)
1.05
1200
1000
800
35
10
5
10 100 1K 10K 100K 1M 10M
FREQUENCY F (Hz)
40
SLEW RATE VS COMP
15
CC, RC
45
DISTORTION, THD (%)
20
10
–270
OUTPUT VOLTAGE, VO (VP-P)
0
QUIESCENT CURRENT
1.10
RC = 220Ω
3K
30K
10K
FREQUENCY, F (Hz)
100K
INPUT NOISE VOLTAGE
20
15
10
7
5
3
2
10
100
10K
1K
FREQUENCY, F (Hz)
100K
CURRENT LIMIT
100
CURRENT LIMIT, ILIM (mA)
OPEN LOOP GAIN, A (dB)
–135
–225
100
SLEW RATE, (V/ μS)
–90
NORMALIZED QUIESCENT CURRENT, IQ (X)
PHASE, Ф (°)
24
120
COMMON MODE REJECTION, CMR (dB)
33pf, 220Ω
–45
32
–20
PHASE RESPONSE
0
INPUT NOISE VOLTAGE, eN (nV/√Hz)
POWER DERATING
40
VOLTAGE DROP FROM SUPPLY, VS-VO (V)
OUTPUT STAGE
INTERNAL POWER DISSIPATION, P(W)
P r o d u c t I n n o v a t i o nF r o m
80
60
40
20
0
0
20
80
40
60
RESISTOR VALUE, RCL (Ω)
100
3
PA89 • PA89A
P r o d u c t I n n o v a t i o nF r o m
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.Cirrus.com for design tools that help
automate tasks such as calculations for stability, internal power
dissipation, current limit; heat sink selection; Apex Precision
Power’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)
OUTPUT CURRENT FROM +VS OR –VS (mA)
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.
100
SOA
10mS
25°C
50
100mS
30
15
125°C
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
85°C
10
5
T = TCASE
3
200
100
300
500
800 1000 1200
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE, VS – VO (V)
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 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.
POWER SUPPLY PROTECTION
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.
The very high operating voltages of the PA89 demand consideration of two component specifications rarely of concern in
building op amp circuits: voltage rating and voltage coefficient.
The compensation capacitance CC must be rated for the
4
PA89U
P r o d u c t I n n o v a t i o nF r o m
PA89 • PA89A
Contacting Cirrus Logic Support
For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact [email protected]
International customers can also request support by contacting their local Cirrus Logic Sales Representative.
To find the one nearest to you, go to www.cirrus.com
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Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject
to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant
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does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE
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PA89U
5