PAdd51, PAo51Aoo n F
F r o m
r o m
PA51 • PA51A
P
P
r
r
o
o
u
u
c
c
t
t I
I
n
n
n
n
o v
v
a
a t
t
i
i
PA51 • PA51A
Power Operational Amplifier
FEATURES
•ꢀWIDEꢀSUPPLYꢀRANGEꢀ—ꢀ±10ꢀtoꢀ±40V
•ꢀHIGHꢀOUTPUTꢀCURRENTꢀ—ꢀ±10AꢀPeak
•ꢀCLASSꢀ“C”ꢀOUTPUTꢀ—ꢀLowꢀCost
•ꢀLOWꢀQUIESCENTꢀCURRENTꢀ—ꢀ2.6mA
APPLICATIONS
•ꢀDCꢀSERVOꢀAMPLIFIER
8-PINꢀTO-3
PACKAGEꢀSTYLEꢀCE
•ꢀMOTOR/SYNCHROꢀDRIVER
•ꢀVALVEꢀANDꢀACTUATORꢀCONTROL
•ꢀDCꢀORꢀACꢀPOWERꢀREGULATOR
TYPICALꢀAPPLICATION
C1
DESCRIPTION
The PA51 and PA51A are high voltage, high output current
operationalamplifiersdesignedtodriveresistive,inductiveand
capacitiveloads.Theircomplementarycommonemitteroutput
stage is the simple class C type optimized for low frequency
applications where crossover distortion is not critical. These
amplifiersarenotrecommendedforaudio,transducerordeflec-
tion coil drive circuits. The safe operating area (SOA) is fully
specified and can be observed for all operating conditions by
selectionofuserprogrammablecurrentlimitingresistors.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-pinTO-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”.
R3
+10V
0/+5V
R1
.1Ω
DAC
0/6A
4.16K
PA51
R2
2.5K
R4
M
.1Ω
–28V
R5
.5Ω
MOTOR CURRENT IS A FUNCTION OF VIN
PROGRAMMABLE TORQUE CIRCUIT
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
OpAmp insure accuracy.With this closed loop operation, tem-
perature induced impedance variations of the motor winding
are automatically compensated.
EXTERNALꢀCONNECTIONS
EQUIVALENTꢀSCHEMATIC
RCL+
CL+
+VS
2
3
OUT
3
1
Q1A
Q1B
OUTPUT
+IN
4
TOP VIEW
2
–IN
5
Q3
Q4
8
4
5
RCL–
CL–
6
7
A1
1
8
–VS
N.C.
C1
Q6B
Q6A
6
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 2009
APEX − PA51UREVR
PA51U
1
http://www.cirrus.com