30A, 100V, 100V/µs Power Amplifier0 pages

PA05 • PA05A
PA05 • PA05A

PA05, PA05A

Power Operational Amplifier
FEATURES
•t HIGH INTERNAL DISSIPATION — 250 WATTS
•t HIGH VOLTAGE, HIGH CURRENT — 100V, 30A
•t HIGH SLEW RATE — 100V/µS
•t 4 WIRE CURRENT LIMIT SENSING
•t LOW DISTORTION
•t EXTERNAL SHUTDOWN CONTROL
•t OPTIONAL BOOST VOLTAGE INPUTS
•t EVALUATION KIT — SEE EK09

12-PIN POWER DIP
PACKAGE STYLE CR
The JEDEC MO-127 12-pin Power Dip™ package (see
Package Outlines) is hermetically sealed and isolated from
the internal circuits. The use of compressible thermal washers
and/or improper mounting torque will void the product warranty.
Please see “General Operating Considerations”
.

APPLICATIONS
•t LINEAR AND ROTARY MOTOR DRIVES
• SONAR TRANSDUCER DRIVER
•t YOKE/MAGNETIC FIELD EXCITATION
•t PROGRAMMABLE POWER SUPPLIES TO ±45V
•t AUDIO UP TO 500W

TYPICAL APPLICATION

DESCRIPTION
The PA05 is a high voltage MOSFET power operational
amplifier that extends the performance limits of power amplifiers in slew rate and power bandwidth, while maintaining high
current and power dissipation ratings.
The PA05 is a highly flexible amplifier. The shutdown control
feature allows the output stage to be turned off for standby
operation or load protection during fault conditions. Boost
voltage inputs allow the small signal portion of the amplifier to
operate at a higher voltage than the high current output stage.
The amplifier is then biased to achieve close linear swings to
the supply rails at high currents for extra efficient operation.
External compensation tailors slew rate and bandwidth performance to user needs. A four wire sense technique allows
precision current limiting without the need to consider internal
or external milliohm parasitic resistance in the output line. The
output stage is protected by thermal limiting circuits above
junction temperatures of 175°C.

EQUIVALENT SCHEMATIC
SHUTDOWN
12
D1
Q1
Q12

Q16

Q13

Q8
Q4

4

COMP
3

Q17

Q10

Q14

BIAS

Q30
–VBOOST
5

www.apexanalog.com
PA05U

Q18

ILIM
11
10
ILIM

Q24

Q25

D20

OUT
7

D5

Q22

–IN
1
D19
+IN
2

Q5

D6
D9

Q21
Q29

D27
D31

Rf

CONTROL
LOGIC
ULTRASONIC
DRIVE

Ri

1
2

12

PA05
11

7
R CL

10
TUNED
TRANSFORMER

EXTERNAL CONNECTIONS
–INPUT

+Vs 8

9
+VBOOST

The high power bandwidth of the PA05 allows driving sonar
transducers via a resonant circuit including the transducer and
a matching transformer. The load circuit appears resistive to
the PA05. Control logic turns off the amplifier's output during
shutdown.

Q33

D4
6 –Vs

+INPUT
COMP
R
CC C
COMP
–V BOOST

*

SHUTDOWN
1

12

2

11

3
4

TOP
VIEW

10
9

5

8

6

7

–SUPPLY

CURRENT LIMIT
CURRENT LIMIT
+V BOOST

*
+SUPPLY
OUTPUT

PHASE COMPENSATION
Gain
CC
RC
1
470pF
120Ω
>3
220pF
120Ω
≥10
82pF
120Ω
CC RATED FOR FULL SUPPLY VOLTAGE
*See BOOST OPERATION paragraph.

Copyright © Apex Microtechnology, Inc. 2012
(All Rights Reserved)

SEP 2012
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PA05U REVL