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PA61A

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描述
POWER OPERATIONAL AMPLIFIERS

PA61A 数据手册

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PA61 • PA61A  
P r o d u c t I n n o v a t i o n F r o m  
108&3ꢀ01&3"5*0/"-ꢀ".1-*'*&34  
FEATURES  
•ꢀWIDEꢀSUPPLYꢀRANGEꢀ—ꢀ±1ꢁꢀtoꢀ±±45  
•ꢀHIGHꢀOUTPUTꢀCURRENTꢀ—ꢀ±1ꢁAꢀPeak  
•ꢀLOWꢀCOSTꢀ—ꢀClassꢀ“C”ꢀoutputꢀstage  
•ꢀLOWꢀQUIESCENTꢀCURRENTꢀ—ꢀ3mA  
APPLICATIONS  
•ꢀPROGRAMMABLEꢀPOWERꢀSUPPLY  
•ꢀMOTOR/SYNCROꢀDRI5ER  
•ꢀ5AL5EꢀANDꢀACTUATORꢀCONTROL  
•ꢀDCꢀORꢀACꢀPOWERꢀREGULATOR  
•ꢀFIXEDꢀFREQUENCYꢀPOWERꢀOSCILLATOR  
8-PINꢀTO-3  
PACKAGEꢀSTYLEꢀCE  
3'ꢃꢄ  
4&/4&ꢄ)*  
ꢀꢁꢂ7  
3$-ꢀꢄ  
065  
™ꢃꢆ7  
%"$  
3*/ꢃ  
3*/ꢂ  
38ꢄ  
DESCRIPTION  
1"ꢅꢃ  
The PA61 and PA61A are high output current operational  
amplifiers designed to drive resistive, inductive and capaci-  
tive loads. Their complementary emitter follower output stage  
is the simple class C type and optimized for low frequency  
applications where crossover distortion is not critical. These  
amplifiers are not recommended for audio, transducer or  
deflection coil drive circuits above 1kHz or when distortion is  
critical. The safe operating area (SOA) is fully specified and  
can be observed for all operating conditions by selection of  
user programmable current limiting resistors. Both amplifiers  
are internally compensated for all gain settings. For continu-  
ous operation under load, mounting on a heatsink of proper  
rating is recommended.  
This hybrid circuit utilizes thick film conductors, ceramic  
capacitors, and semiconductor chips to maximize reliabil-  
ity, 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 compres-  
sible thermal washers and/or improper mounting torque  
voids the product warranty. Please see “General Operating  
Considerations”.  
3$-mꢄ  
-0"%  
3
mꢁꢂ7  
'ꢂꢄ 4&/4&ꢄ-0  
35/ꢄ  
38ꢄ  
'*(63&ꢄꢃꢇꢄ130(3".."#-&ꢄ108&3ꢄ4611-:ꢄ  
8*5)ꢄ3&.05&ꢄ4&/4*/(  
TYPICALꢀAPPLICATION  
Due to its high current drive capability, PA61 applications  
oftenutilizeremotesensingtocompensateIRdropsinthewir-  
ing. The importance of remote sensing increases as accuracy  
requirements, output currents, and distance between ampli-  
fier and load go up. The circuit above shows wire resistance  
from the PA61 to the load and back to the local ground via  
the power return line. Without remote sensing, a 7.5A load  
current across only 0.05 ohm in each line would produce a  
0.75V error at the load.  
With the addition of the second ratio matched RF/RIN pair  
and two low current sense wires, IR drops in the power return  
line become common mode voltages for which the op amp  
has a very high rejection ratio. Voltage drops in the output and  
powerreturnwiresareinsidethefeedbackloop. Therefore, as  
long as the Power Op Amp has the voltage drive capability to  
overcometheIRlosses, accuracyremainsthesame. Applica-  
tion Note 7 presents a general discussion of PPS circuits.  
EQUI5ALENTꢀSCHEMATIC  
2ꢂ"  
2ꢂ#  
EXTERNALꢀCONNECTIONS  
3$-ꢉ  
2ꢃ  
2ꢅ  
$
-ꢉ  
"ꢂ  
ꢉ74  
065  
065165  
ꢉ*/  
m*/  
501ꢀ7*&8  
$ꢂ  
3$-m  
2ꢄ#  
2ꢄ"  
$
-m  
m74  
/ꢊ$ꢊ  
Copyright © Cirrus Logic, Inc. 2007  
Cirrus Logic, Inc.  
NOV 2007  
PA61Uꢀ ꢀ  
1
(All Rights Reserved)  
http://www.cirrus.com  
PA61U rev K  

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