PA92
PA92
P r o d u c t IInnnnoovvaa t i o n FFr roomm
High Voltage Power Operational Amplifiers
FEATURES
DESCRIPTION
The PA92 is a high voltage, low quiescent current
MOSFET operational amplifier designed as a low cost
solution for driving continuous output currents up to 4A
and pulse currents up to 7A. The safe operating 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. External compensation provides flexibility in choosing bandwidth and slew
rate for the application. APEX’s Power SIP package
uses a minimum of board space allowing for high density circuit boards. The Power SIP package is electrically isolated.
♦ HIGH VOLTAGE — 400V (±200V)
♦ LOW QUIESCENT CURRENT — 10mA
♦ HIGH OUTPUT CURRENT — 4A
♦ PROGRAMMABLE CURRENT LIMIT
APPLICATIONS
♦ PIEZOELECTRIC POSITIONING
♦ HIGH VOLTAGE INSTRUMENTATION
♦ ELECTROSTATIC TRANSDUCERS
♦ PROGRAMMABLE POWER SUPPLIES UP
TO 390V
EQUIVALENT SCHEMATIC
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PA92U http://www.cirrus.com
Copyright
© Cirrus Logic, Inc. 2008
(All Rights Reserved)
AUG 2008
APEX − PA92REVI
PA92
P r o d u c t I n n o v a t i o nF r o m
EXTERNAL CONNECTIONS
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12-pin SIP
PACKAGE
STYLE DP
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PATENTED
Formed leads available
See package style EE
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1. Characteristics and Specifications
Absolute Maximum Ratings
Parameter
Symbol
Min
SUPPLY VOLTAGE, +VS to -VS
OUTPUT CURRENT, source, sink, peak, within SOA
Max
Units
400
V
7
A
80
W
INPUT VOLTAGE, differential
-20
20
V
INPUT VOLTAGE, common mode
-VS
VS
V
TEMPERATURE, pin solder, 10s max.
260
°C
TEMPERATURE, junction (Note 2)
150
°C
POWER DISSIPATION, continuous @ TC = 25°C
TEMPERATURE RANGE, storage
−40
85
°C
OPERATING TEMPERATURE RANGE, case
−25
85
°C
CAUTION
The PA92 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.
Specifications
Parameter
Test Conditions
Min
Typ
Max
Units
2
10
mV
15
50
µV/°C
25
INPUT
OFFSET VOLTAGE, initial
Full temperature range
OFFSET VOLTAGE vs. temperature
OFFSET VOLTAGE vs. supply
10
OFFSET VOLTAGE vs. time
75
BIAS CURRENT, initial
200
BIAS CURRENT vs. supply
4
OFFSET CURRENT, initial
50
10
INPUT IMPEDANCE, DC
COMMON MODE REJECTION, DC
VCM = ±90V
NOISE
100KHz bandwidth,
RS = 1KΩ, CC = 10pF
500
pA
Ω
11
pF
V
80
pA
pA/V
±VS Ŧ 15
COMMON MODE VOLTAGE RANGE
(Note 3)
2000
4
INPUT CAPACITANCE
µV/V
µV/kh
98
dB
1
µV RMS
PA92U
PA92
P r o d u c t I n n o v a t i o nF r o m
Parameter
Test Conditions
Min
Typ
Max
Units
94
111
dB
GAIN
OPEN LOOP @ 15Hz
RL = 2KΩ, CC = 10pF
GAIN BANDWIDTH PRODUCT @ 1MHz
RL = 2KΩ, CC = 10pF
18
MHz
POWER BANDWIDTH
RL = 2KΩ, CC = 10pF
30
kHz
PHASE MARGIN
Full temperature range
60
°
±VS Ŧ 10
V
OUTPUT
IO = 4A
VOLTAGE SWING (Note 3)
±VS Ŧ 12
4
CURRENT, continuous
SLEW RATE, A V = 100
CC = 10pF
CAPACITIVE LOAD, A V = +1
Full temperature range
SETTLING TIME to 0.1%
CC = 10pF, 2V step
A
50
V/µS
1
RESISTANCE, no load
nF
1
µS
10
Ω
POWER SUPPLY
±50
VOLTAGE (Note 5)
CURRENT, quiescent
±150
±200
V
10
14
mA
THERMAL
RESISTANCE, AC, junction to case
(Note 4)
Full temp range, F > 60Hz
1
°C/W
RESISTANCE, DC, junction to case
Full temp range, F < 60Hz
1.5
°C/W
RESISTANCE, junction to air
Full temp range
TEMPERATURE RANGE, case
Meets full range specifications
30
-25
°C/W
+85
°C
NOTES:
1. (All Min/Max characteristics and specifications are guaranteed over the Specified Operating Conditions. Typical performance characteristics and specifications 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 0.625 V/°C below 25°C case. No derating needed above 25°C case.
PA92U PA92
P r o d u c t I n n o v a t i o nF r o m
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PA92U
PA92
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’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 diagram. 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 40"
SAFE OPERATING AREA (SOA)
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.
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.
INPUT PROTECTION
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Although the PA92 can withstand differential voltages up to ±20V, additional external protection is recommended. Low leakage, low capacitance
JFETs connected as diodes are recommended (e.g. 2N4416, Q1-Q4 in
Figure 2). The differential input voltage will be clamped to ±1.4V. This is
sufficient overdrive to produce maximum power bandwidth.
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POWER SUPPLY PROTECTION
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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
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power supply should be evaluated for transient performance including 1305&$5*0/
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.
PA92U PA92
P r o d u c t I n n o v a t i o nF r o m
STABILITY
The PA92 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 CC must be rated at 500V working
voltage. An NPO capacitor is recommended. The compensation network CCRC must be mounted closely to the amplifier 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.
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
IMPORTANT NOTICE
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.
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PA92U