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PDF PA85 Data sheet ( Hoja de datos )
| Número de pieza | PA85 | |
| Descripción | HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS | |
| Fabricantes | ETC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de PA85 (archivo pdf) en la parte inferior de esta página. Total 4 Páginas | ||
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MICROTECHNOLOGY
HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
PA85 • PA85A
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739
FEATURES
• HIGH VOLTAGE — 450V (±225V)
• HIGH SLEW RATE — 1000V/µS
• 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
Q1 Q2 Q4
Q6
–IN
5
Q10A
Q7
Q10B
+IN
4
Q13
D2
3
D1 +VS
D23
COMP
78
Q8 Q9
Q12
CL
2
Q11
Q17
Q16
1
OUT
Q18
–VS
6
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.
DC
FOCUS
X SWEEP
SAMPLE
z = x2 + y2
Y SWEEP
SAMPLE
R IN1
R IN2
RF
+225V
R CL
PA85
TO
FOCUS
GRID
–225V
EXTERNAL CONNECTIONS
+Vs
3
CL RCL
2
+IN 4
–IN 5
TOP VIEW
1 OUT
COMP
8
PHASE COMPENSATION
Gain
1
CC
68pF
RC
100Ω
20 10pF 330Ω
100 3.3pF
0Ω
CC RATED FOR FULL
SUPPLY VOLTAGE
67
–Vs COMP
RC
CC
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
1 page | ||
| Páginas | Total 4 Páginas | |
| PDF Descargar | [ Datasheet PA85.PDF ] | |
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