鈥?/div>
HIGH INTERNAL DISSIPATION 鈥?250 WATTS
HIGH VOLTAGE, HIGH CURRENT 鈥?100V, 30A
HIGH SLEW RATE 鈥?100V/碌S
4 WIRE CURRENT LIMIT SENSING
LOW DISTORTION
EXTERNAL SHUTDOWN CONTROL
OPTIONAL BOOST VOLTAGE INPUTS
EVALUATION KIT 鈥?SEE EK04
APPLICATIONS
鈥?LINEAR AND ROTARY MOTOR DRIVES
鈥?SONAR TRANSDUCER DRIVER
鈥?YOKE/MAGNETIC FIELD EXCITATION
鈥?PROGRAMMABLE POWER SUPPLIES TO
鹵45V
鈥?AUDIO UP TO 500W
The DIP04 12-pin package (see Package Outlines) is
hermetically sealed and isolated from the internal circuits. The
use of compressible thermal washers and/or improper mount-
ing torque will void the product warranty. Please see 鈥淕eneral
Operating Considerations鈥?
DESCRIPTION
The PA33 is a high voltage MOSFET power operational
amplifier that extends the performance limits of power ampli-
fiers in slew rate and power bandwidth, while maintaining high
current and power dissipation ratings.
The PA33 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 perfor-
mance 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擄C.
TYPICAL APPLICATION
The high power bandwidth of the PA33 allows driving sonar
transducers via a resonant circuit including the transducer and
a matching transformer. The load circuit appears resistive to
the PA33. Control logic turns off the amplifier's output during
shutdown.
R
f
CONTROL
LOGIC
ULTRA-
SONIC
DRIVE
R
i
1
2
12
PA33
11
10
7
R
CL
EQUIVALENT SCHEMATIC
SHUTDOWN
12
9
+V
BOOST
Q1
Q12
Q13
4
COMP
3
D6
D9
D5
Q10
Q16
鈥揑N
1
D19
+IN
2
D20
D27
D31
Q30
鈥揤
BOOST
5
D4
6 鈥揤s
Q33
TUNED
TRANSFORMER
+Vs 8
EXTERNAL CONNECTIONS
鈥揑NPUT
SHUTDOWN
1
2
3
4
5
6
TOP
VIEW
12
11
10
9
8
7
D1
Q8
Q4
Q5
OUT
7
I
LIM
11
10
Q24
Q25
BIAS
Q21
Q29
I
LIM
Q14
Q18
Q17
Q22
+INPUT
COMP
R
C
C C
COMP
鈥揤
BOOST
CURRENT LIMIT
CURRENT LIMIT
+V
BOOST
*
+SUPPLY
OUTPUT
*
鈥揝UPPLY
Gain
1
>3
鈮?0
PHASE COMPENSATION
C
C
470pF
220pF
82pF
R
C
120鈩?/div>
120鈩?/div>
120鈩?/div>
C
C
RATED FOR FULL SUPPLY VOLTAGE
*See
BOOST OPERATION
paragraph.
APEX MICROTECHNOLOGY CORPORATION
鈥?TELEPHONE (520) 690-8600 鈥?FAX (520) 888-3329 鈥?ORDERS (520) 690-8601 鈥?EMAIL prodlit@apexmicrotech.com
1
2
3
4
