PA84 Datasheet, PDF (1/5 Pages) Cirrus Logic – POWER OPERATIONAL AMPLIFIERS

Product
PA8^IP4ⁿr,ⁿoP^od^vuA^ac^t8tⁱI^o4nⁿAn o,vPa At i o8n4FSr o m
From
PA84P•AP84A•8P4AA84•AP•AP8A48S4S
Power Operational Amplifiers
FEATURES
• HIGH SLEW RATE — 200V/µs
• FAST SETTLING TIME — .1% in 1µs (PA84S)
• FULLY PROTECTED INPUT — Up to ±150v
• LOW BIAS CURRENT, LOW NOISE — FET Input
• WIDE SUPPLY RANGE — ±15V to ±150V
APPLICATIONS
• HIGH VOLTAGE INSTRUMENTATION
• ELECTROSTATIC TRANSDUCERS & DEFLECTION
• PROGRAMMABLE POWER SUPPLIES UP TO 290V
• ANALOG SIMULATORS
DESCRIPTION
The PA84 is a high voltage operational amplifier designed
for output voltage swings up to ±145V with a dual supply or
290V with a single supply. Two versions are available. The
new PA84S, fast settling amplifier can absorb differential input
overvoltages up to ±50V while the established PA84 and PA84A
can handle differential input overvoltages of up to ±300V. Both
versions are protected against common mode transients and
overvoltages up to the supply rails. High accuracy is achieved
with a cascode input circuit configuration. All internal biasing
is referenced to a zener diode fed by a FET constant current
source. As a result, the PA84 features an unprecedented sup-
ply range and excellent supply rejection. The output stage is
biased-on for linear operation. External phase compensation
allows for user flexibility in obtaining the maximum slew rate.
Fixed current limits protect these amplifiers against shorts
to common at supply voltages up to 150V. For operation into
inductive loads, two external flyback pulse protection diodes
are recommended. However, a heatsink may be necessary to
maintain the proper case temperature under normal operating
conditions.
This hybrid integrated circuit utilizes a beryllia (BeO) sub-
strate, thick film resistors, ceramic capacitors and semiconduc-
tor chips to maximize reliability, minimize size and give top
performance. Ultrasonically bonded aluminum wires provide
reliable interconnections at all operating temperatures. The
8-pin TO-3 package is hermetically sealed and electrically
isolated. The use of compressible thermal isolation washers
and/or improper mounting torque will void the product warranty.
Please see “General Operating Considerations”.
EXTERNAL CONNECTION
BAL
3
+V_S
2
1 OUT
4
C_C
BAL
TOP VIEW
5
–IN
6
+IN
R_C
8
7
COMP
–V_S
PHASE COMPENSATION
GAIN C_C
R_C
1
10
100
1000
10nF
500pF
50pF
none
200Ω
2KΩ
20KΩ
none
NOTES:
1. Phase Compensation required
for safe operation.
2. Input offset trimpot optional.
Recommended value 100KΩ.
100K 50K
8-pin TO-3
PACKAGE STYLE CE
+150V
4.7K
10V
DAC
10K
390pF
PA84
INK JET ^{• • • • • •}
CONTROL
••••••
••••••
–150V
TYPICAL APPLICATION
The PA84 is ideally suited to driving ink jet control units (often
a piezo electric device) which require precise pulse shape
control to deposit crisp clear date or lot code information on
product containers. The external compensation network has
been optimized to match the gain setting of the circuit and the
complex impedance of the ink jet control unit.The combination
of speed and high voltage capabilities of the PA84 form ink
droplets of uniform volume at high production rates to enhance
the value of the printer.
EQUIVALENT SCHEMATIC
4
2
C1
3
Q1
D1
Q3
Q2
Q4
Q5
8
Q8
C5 _*
C4
5
Q12A
*
Q13 _*
Q14 _*
6*
Q15
Q9
Q10
Q11
Q12B
Q6
Q7
1
Q17
Q16
C6 _*
D2
7
*Not included in PA84S.
PA84_hU_{ttp://www.cirrus.com}
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 2009₁
APEX − PA84UREVP