鈩?/div>
MOTOR
DESCRIPTION
The PA07 is a high voltage, high output current operational
amplifier designed to drive resistive, inductive and capacitive
loads. For optimum linearity, especially at low levels, the
output stage is biased for class A/B operation using a ther-
mistor compensated base-emitter voltage multiplier circuit. A
thermal shutoff circuit protects against overheating and mini-
mizes heatsink requirements for abnormal operating condi-
tions. The safe operating area (SOA) can be observed for all
operating conditions by selection of user programmable cur-
rent limiting resistors. Both amplifiers are internally compen-
sated for all gain settings. For continuous operation under
load, a heatsink of proper rating is recommended.
This hybrid circuit utilizes thick film (cermet) resistors, ce-
ramic capacitors and semiconductor chips to maximize reli-
ability, minimize size and give top performance. Ultrasonically
bonded aluminum wires provide reliable interconnections at all
operating temperatures. The 8-pin TO-3 package is hermeti-
cally sealed and electrically isolated. The use of compressible
washers and/or improper mounting torque will void the product
warranty. Please see 鈥淕eneral Operating Considerations鈥?
+V
R
CL鈥?/div>
.68
鈩?/div>
LIGHT
鈥?2V
鈥揤
PD1
PD2
Negates optoelectronic instabilities
Lead network minimizes overshoot
SEQUENTIAL POSITION CONTROL
Position is sensed by the differentially connected photo
diodes, a method that negates the time and temperature
variations of the optical components. Off center positions
produce an error current which is integrated by the op amp
circuit, driving the system back to center position. A momen-
tary switch contact forces the system out of lock and then the
integrating capacitor holds drive level while both diodes are in
a dark state. When the next index point arrives, the lead
network of C1 and R1 optimize system response by reducing
overshoot. The very low bias current of the PA07 augments
performance of the integrator circuit.
EQUIVALENT SCHEMATIC
3
7
Q1
Q5
Q8
Q9
C3
5
4
Q12A
Q15
Q18
D2
6
Q12B
Q10
C4
D3
Q17A
Q16
C2
Q7
1
Q11
Q19
8
Q17B
Q2
D1
Q4
Q3
C1
Q6A
Q6B
2
EXTERNAL CONNECTIONS
+V
S
3
CL+
2
1
R
CL+
OUT
OUTPUT
R
T
+IN
4
TOP VIEW
R
S
鈥揑N
5
6
7
8
CL鈥?/div>
R
CL鈥?/div>
鈥揤
S
BAL
R
S
= ( V
S
+ + 鈥揤
S
) R
T
/1.6
NOTE: Input offset voltage trim optional. R
T
= 10K鈩?MAX
8-pin TO-3 package
APEX MICROTECHNOLOGY CORPORATION
鈥?TELEPHONE (520) 690-8600 鈥?FAX (520) 888-3329 鈥?ORDERS (520) 690-8601 鈥?EMAIL prodlit@apexmicrotech.com
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