�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½
�½�½�½�½�½�½�½�½�½�½�½�½
�½ �½ �½ �½ �½ �½ �½ �½ �½ �½ �½ �½ �½ �½ �½
�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½
FEATURES
•
•
•
•
WIDE SUPPLY RANGE — ±10 to ±40V
HIGH OUTPUT CURRENT — ±10A Peak
CLASS “C” OUTPUT — Low Cost
LOW QUIESCENT CURRENT — 2.6mA
APPLICATIONS
•
•
•
•
DC SERVO AMPLIFIER
MOTOR/SYNCHRO DRIVER
VALVE AND ACTUATOR CONTROL
DC OR AC POWER REGULATOR
8-PIN TO-3
PACKAGE STYLE CE
TYPICAL APPLICATION
�½�½
DESCRIPTION
The PA51 and PA51A are high voltage, high output current
operational amplifiers designed to drive resistive, inductive
and capacitive loads. Their complementary common emitter
output stage is the simple class C type optimized for low fre-
quency applications where crossover distortion is not critical.
These amplifiers are not recommended for audio, transducer
or deflection coil drive circuits. The safe operating area (SOA)
is fully specified and can be observed for all operating con-
ditions by selection of user programmable current limiting
resistors. Both amplifiers are internally compensated for all
gain settings. For continuous operation under load, mounting
on a heatsink of proper rating is recommended. Do not use
isolation washers!
This hybrid integrated circuit utilizes thick film conductors,
ceramic 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 electri-
cally isolated and hermetically sealed. The use of compress-
ible thermal washers and/or improper mounting torque will
void the product warranty. Please see “General Operating
Considerations”.
�½�½�½�½
�½�½�½�½�½
�½�½�½
�½�½
�½�½�½
�½
�½�½
�½�½�½�½�½
�½�½
�½�½�½�½
�½�½�½�½
�½�½
�½�½�½�½
�½�½�½�½
�½�½�½
�½
�½
�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½
�½�½
�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½
�½�½
�½�½�½
�½
The linear relationship of torque output to current input of
the modern torque motor makes this simple control circuit
ideal for many material processing and testing applications.
The sense resistor develops a feedback voltage proportional
to motor current and the small signal properties of the Power
Op Amp insure accuracy. With this closed loop operation,
temperature induced impedance variations of the motor wind-
ing are automatically compensated.
EXTERNAL CONNECTIONS
�½�½�½�½
�½
�½
EQUIVALENT SCHEMATIC
�½
�½�½�½
�½
�½�½�½
�½�½�½
�½
�½
�½�½�½
�½�½�½
�½
�½�½�½
�½
�½�½�½�½�½�½
�½�½�½�½�½�½�½�½
�½�½
�½
�½�½
�½
�½�½
�½�½
�½�½�½
�½
�½�½�½
�½
�½
�½�½�½
�½
�½
�½
�½
�½�½�½
�½
�½�½�½
�½�½�½�½
�½
�½�½�½�½
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
1
APEX [ CIRRUS LOGIC ]
