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PDF PA88 Data sheet ( Hoja de datos )

Número de pieza PA88
Descripción HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
Fabricantes ETC 
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No Preview Available ! PA88 Hoja de datos, Descripción, Manual

MICROTECHNOLOGY
HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
PA88 • PA88A
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739
FEATURES
• HIGH VOLTAGE — 450V (±225V)
• LOW QUIESCENT CURRENT — 2mA
• HIGH OUTPUT CURRENT — 100mA
• PROGRAMMABLE CURRENT LIMIT
• LOW BIAS CURRENT — FET Input
APPLICATIONS
• PIEZOELECTRIC POSITIONING
• HIGH VOLTAGE INSTRUMENTATION
• ELECTROSTATIC TRANSDUCERS
• PROGRAMMABLE POWER SUPPLIES UP TO 440V
DESCRIPTION
The PA88 is a high voltage, low quiescent current MOSFET
operational amplifier designed for output currents up to 100mA.
Output voltages can swing up to ±215V with a dual supply and
up to +440 volts with a single supply. 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. All internal biasing is
referenced to a bootstrapped zener-MOSFET current source.
As a result, the PA88 features an unprecedented supply range
and excellent supply rejection. The MOSFET output stage is
biased on for linear operation. External compensation pro-
vides user flexibility.
This hybrid circuit utilizes beryllia (BeO) substrates, thick
film resistors, ceramic capacitors and semiconductor chips to
maximize reliability, minimize size and give top performance.
Ultrasonically bonded aluminum wires provide reliable inter-
connections 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 im-
proper mounting torque will void the product warranty. Please
see “General Operating Considerations”.
EQUIVALENT SCHEMATIC
D1
3
+VS
Q1
Q6
– IN
5
Q10A
Q2 Q4
Q7
+ IN
4
Q10B
D19
COMP
78
Q8 Q9
Q12
Q11
Q17
CL
2
1
OUT
Q13
Q16
D2
Q18
–VS
6
PATENTED
TYPICAL APPLICATION
RF
+VS
CC
R IN
PA88
PIEZO DRIVE
V OUT
COMPUTER
FOCUS
COMMAND
VOLTAGE
–V S
LOWPOWER,PIEZOELECTRICPOSITIONING
Piezo positioning may be applied to the focusing of seg-
mented mirror systems. The composite mirror may be com-
posed of hundreds of elements, each requiring focusing under
computer control. In such complex systems the PA88’s advan-
tage of low quiescent power consumption reduces the costs of
power supplies and cooling, while providing the interface
between the computer and the high voltage drive to the piezo
positioners.
EXTERNAL CONNECTIONS
+Vs
3
CL RCL
2
+IN 4
TOP VIEW
1 OUT
PHASE COMPENSATION
GAIN
1
10
20
100
CC
68pf
33pf
15pf
3.3pf
RC
100
100
100
–IN 5
67
–Vs COMP
COMP
8
CC
RCL
=
.7
ILIM
RC
CC RATED FOR FULL
SUPPLY VOLTAGE
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]

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