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参数资料
| 型号： | PA85 |
| 厂商： | Electronic Theatre Controls, Inc. |
| 元件分类： | 运算放大器 |
| 英文描述： | HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS |
| 中文描述： | 高压功率运算放大器 |
| 文件页数： | 1/4页 |
| 文件大小： | 59K |
| 代理商： | PA85 |
APEX MICROTECHNOLOGY CORPORATION
TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
FEATURES
HIGH VOLTAGE — 450V (
±
225V)
HIGH SLEW RATE — 1000V/
μ
S
HIGH OUTPUT CURRENT — 200mA
APPLICATIONS
HIGH VOLTAGE INSTRUMENTATION
PIEZO TRANSDUCER EXCITATION
PROGRAMMABLE POWER SUPPLIES UP TO 430V
ELECTROSTATIC TRANSDUCERS & DEFLECTION
DESCRIPTION
The PA85 is a high voltage, high power bandwidth MOSFET
operational amplifier designed for output currents up to 200mA.
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 PA85 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 thick film (cermet) resistors, ce-
ramic capacitors and silicon semiconductor chips to maximize
reliability, minimize size and give top performance. Ultrasoni-
cally bonded aluminum wires provide reliable interconnec-
tions at all operating temperatures. The 8-pin TO-3 package is
hermetically sealed and electrically isolated. The use of com-
pressible isolation washers voids the warranty.
EQUIVALENT SCHEMATIC
2
1
3
6
4
5
8
7
COMP
C
OUT
+V
S
–V
S
L
Q1
Q2
Q4
Q8
Q9
Q6
Q7
Q12
Q10A
Q10B
Q11
Q17
Q13
Q16
Q18
D1
D23
D2
–IN
+IN
PATENTED
TYPICAL APPLICATION
Dynamic focusing is the active correction of focusing volt-
age as a beam traverses the face of a CRT. This is necessary
in high resolution flat face monitors since the distance be-
tween cathode and screen varies as the beam moves from the
center of the screen to the edges. PA85 lends itself well to this
function since it can be connected as a summing amplifier with
inputs from the nominal focus potential and the dynamic
correction. The nominal might be derived from a potentiom-
eter, or perhaps automatic focusing circuitry might be used to
generate this potential. The dynamic correction is generated
from the sweep voltages by calculating the distance of the
beam from the center of the display.
EXTERNAL CONNECTIONS
z = x + y
2
IN1
R
F
R
CL
R
+225V
–225V
PA85
IN2
R
DC
FOCUS
X SWEEP
SAMPLE
Y SWEEP
SAMPLE
TO
FOCUS
GRID
1
2
3
4
5
6
7
8
TOP VIEW
CL
+Vs
+IN
–Vs
COMP
OUT
R
CL
–IN
C
C
COMP
R
C
PHASE COMPENSATION
Gain
C
1
68pF
20
10pF
100
3.3pF
R
C
100
330
0
C
RATED FOR FULL
SUPPLY VOLTAGE
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739
M I C R O T E C H N O L O G Y
HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
PA85 PA85A
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