PA04 Datasheet, PDF (1/5 Pages) Cirrus Logic – POWER OPERATIONAL AMPLIFIERS

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PA04PA•0P4 A• P0A40A4A
Power Operational Amplifier
FEATURES
• HIGH INTERNAL DISSIPATION — 200 Watts
• HIGH VOLTAGE, HIGH CURRENT — 200V, 20A
• HIGH SLEW RATE — 50V/µs
• 4 WIRE CURRENT LIMIT SENSING
• LOW DISTORTION
• EXTERNAL SLEEP MODE CONTROL
• OPTIONAL BOOST VOLTAGE INPUTS
• EVALUATION KIT — SEE EK09
APPLICATIONS
• SONAR TRANSDUCER DRIVER
• LINEAR AND ROTARY MOTOR DRIVES
• YOKE/MAGNETIC FIELD EXCITATION
• PROGRAMMABLE POWER SUPPLIES TO ±95V
• AUDIO UP TO 400W
DESCRIPTION
The PA04 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 PA04 is a highly flexible amplifier. The sleep mode
feature allows ultra-low quiescent current for standby opera-
tion or load protection by disabling the entire amplifier. 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 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 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
will void product warranty.
EQUIVALENT SCHEMATIC
12 ^SLEEP
9 ^+VBOOST
D1
Q10
D2
D3
D5
–IN
1
Q14 Q15
D6
+IN
Q17
2
D7
COMP D8
3
+Vs 8
Q5
Q6
D4
Q12
Q13 ^{I LIM}
11
10
I _LIM
Q19
Q18
D9
7
OUT
Q7
Q21
Q22
4
–V_BOOST
5
COMP
Q20
Q26
–Vs 6
12-pin DIP
TYPICAL APPLICATION
PACKAGE STYLE CR
The high power bandwidth and high voltage output of the
PA04 allows driving sonar transducers via a resonant circuit
including the transducer and a matching transformer.The load
circuit appears resistive to the PA04. Control logic turns off the
amplifier in sleep mode.
R_f
CONTROL
LOGIC
ULTRA- ^R _{i 1}
SONIC
12
DRIVE
2 ^PA04
11
10
7
R _CL
TUNED
TRANSFORMER
Sonar Transducer Driver
EXTERNAL CONNECTIONS
-INPUT
+INPUT
COMP
C_C ^RC
COMP
-V_BOOST
-SUPPLY^*
1
12
2
11
3
10
TOPVIEW
4
9
5
8
6
7
SLEEP
CURRENT LIMIT
CURRENT LIMIT
+V_BOOST
*_+SUPPLY
OUTPUT
PHASE COMPENSATION
Gain
1
>3
≥10
C_C
470pF
220pF
100pF
R_C
120Ω
120Ω
120Ω
C_C RATED FOR FULL SUPPLY VOLTAGE
*See “BOOST OPERATION” paragraph.
PA04_hU_{ttp://www.cirrus.com}
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 2009₁
APEX − PA04UREVL