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PA88A 参数 Datasheet PDF下载

PA88A图片预览
型号: PA88A
PDF下载: 下载PDF文件 查看货源
内容描述: 高压功率运算放大器 [High Voltage Power Operational Amplifiers]
分类和应用: 运算放大器高压
文件页数/大小: 5 页 / 202 K
品牌: CIRRUS [ CIRRUS LOGIC ]
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PA88,
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PA88A
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PA88 • PA88A
PA88 • PA88A
High Voltage Power Operational Amplifiers
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
PATENTED
TYPICAL APPLICATION
R
F
+V
S
C
C
8-PIN TO-3
PACKAGE STYLE CE
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 cur-
rent 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 provides 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 improper
mounting torque will void the product warranty. Please see
“General Operating Considerations”
.
R
IN
PIEZO DRIVE
PA88
COMPUTER
FOCUS
COMMAND
VOLTAGE
–V
S
V
OUT
LOW POWER, PIEZOELECTRIC POSITIONING
Piezo positioning may be applied to the focusing of
segmented mirror systems. The composite mirror may be
composed of hundreds of elements, each requiring focusing
under computer control. In such complex systems the PA88’s
advantage 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
CL
EQUIVALENT SCHEMATIC
3
+V
S
3
2
R
CL
PHASE COMPENSATION
GAIN
C
C
68pf
33pf
15pf
3.3pf
R
CL
= .7
I
LIM
R
C
100W
100W
100W
D1
Q1
Q2
Q4
D19
COMP
7
8
– IN
5
Q6
Q7
+ IN
4
Q8
Q9
Q12
+IN
4
TOP VIEW
1
OUT
1
10
20
100
CL
2
–IN
5
6
7
COMP
8
–Vs
COMP
C
C
Q11
Q10A
Q13
Q10B
Q17
1
OUT
R
C
C
C
RATED FOR FULL
SUPPLY VOLTAGE
Q18
Q16
D2
–V
S
6
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
PA88U
http://www.cirrus.com
MAY 2009
1
APEX − PA88UREVN