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ETC - HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS

Numéro de référence PA89
Description HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
Fabricant ETC 
Logo ETC 





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PA89 fiche technique
MICROTECHNOLOGY
HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
PA89 • PA89A
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739
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
APPLICATIONS
• PIEZOELECTRIC POSITIONING
• HIGH VOLTAGE INSTRUMENTATION
• ELECTROSTATIC DEFLECTION
• SEMICONDUCTOR TESTING
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) sub-
strate, thick film resistors, ceramic capacitors and semicon-
ductor 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.
SIMPLIFIED SCHEMATIC
Q1
Q22
–IN Q25A
1
Q5
Q2
Q23
Q25B +IN
2
D30 D34
D35 D31
Q45
D1
D57
COMP
9 10
Q19
Q26
8
+VS
Q20
CL
7
Q29 6
Q36 OUT
Q42
Q44
D5 –VS
5
PATENTED
TYPICAL APPLICATION
Ultra-high voltage capability combined with the bridge am-
plifier 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.
50R 50R
50R
+600V
+600V
RR
A1
V IN PA89
A2
PA89
PIEZO
TRANSDUCER
Cn
–600V
–600V
SINGLE AXIS MICRO-POSITIONING
EXTERNAL CONNECTIONS*
–IN RESERVED
+IN
N/C
N/C
–VS
1 12
2 11
3
TOP
10
4 VIEW
9
58
67
RESERVED
CC COMP
COMP
RC
+VS
OUT
CL
RCL =
.7
I LIM
R CL
PHASE COMPENSATION
Gain
1
10
15
100
C
C
470pF
68pF
33pF
15pF
R
C
470
220
220
220
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 [email protected]

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