PA05 Datasheet, PDF (1/5 Pages) Cirrus Logic – POWER OPERATIONAL AMPLIFIERS

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PA05PA•0P5 A• P0A50A5A
Power Operational Amplifier
FEATURES
• HIGH INTERNAL DISSIPATION — 250 Watts
• HIGH VOLTAGE, HIGH CURRENT — 100V, 30A
• HIGH SLEW RATE — 100V/µs
• 4 WIRE CURRENT LIMIT SENSING
• LOW DISTORTION
• EXTERNAL SHUTDOWN CONTROL
• OPTIONAL BOOST VOLTAGE INPUTS
• EVALUATION KIT — SEE EK09
APPLICATIONS
• LINEAR AND ROTARY MOTOR DRIVES
• sonar transducer driver
• YOKE/MAGNETIC FIELD EXCITATION
• PROGRAMMABLE POWER SUPPLIES TO ±45V
• AUDIO UP TO 500W
DESCRIPTION
The PA05 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 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 per-
formance 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
+Vs ⁸
9
+V_BOOST
Q12
Q1
Q13
Q16
–IN
1
D19
+IN
2
Q17
D20
Q30
D1
Q8
4 _COMP
3
D27
D31
Q4
D6
Q5
D9
OUT
D5
7
Q10
Q14
Q18 ^ILIM
Q22
11
10
Q24
I_LIM
Q25
BIAS
Q21
Q29
Q33
–V_BOOST
D4
5
6 –Vs
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”.
TYPICAL APPLICATION
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.
R_f
CONTROL
LOGIC
ULTRA- R i ₁
SONIC
12
DRIVE
7
2 ^PA05
R _CL
11
10
EXTERNAL CONNECTIONS
TUNED
TRANSFORMER
–INPUT
+INPUT
COMP
C_C ^{R C}
COMP
–V_BOOST
–SUPPL^*Y
1
12
2
11
3
TOP
10
4
VIEW
9
5
8
6
7
SHUTDOWN
CURRENT LIMIT
CURRENT LIMIT
+V _BOOST
*_+SUPPLY
OUTPUT
PHASE COMPENSATION
Gain
1
>3
≥10
C_C
470pF
220pF
82pF
R_C
120Ω
120Ω
120Ω
C_C RATED FOR FULL SUPPLY VOLTAGE
*See BOOST OPERATION paragraph.
PA05_hU_{ttp://www.cirrus.com}
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 2009₁
APEX − PA05UREVJ