CIRRUS PA05A

PA05PA05
• PA05A
• PA05A
P r o d u c t IPA05A
I nnnnoovvaa t i o n FFr roomm
PA05,
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
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
• LINEAR AND ROTARY MOTOR DRIVES
• sonar transducer driver
• YOKE/MAGNETIC FIELD EXCITATION
• PROGRAMMABLE POWER SUPPLIES TO ±45V
• 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
PA05U
http://www.cirrus.com
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 © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 20091
APEX − PA05UREVJ
PA05 • PA05A
ABSOLUTE MAXIMUM RATINGS
P r o d u c t I n n o v a t i o nF r o m
SUPPLY VOLTAGE, +VS to –VS
BOOST VOLTAGE
OUTPUT CURRENT, continuous within SOA
POWER DISSIPATION, internal
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
TEMPERATURE, pin solder - 10s
TEMPERATURE, junction2
TEMPERATURE, storage
OPERATING TEMPERATURE RANGE, case
SPECIFICATIONS
PARAMETER
TEST CONDITIONS 1
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
OFFSET VOLTAGE, vs. supply
OFFSET VOLTAGE, vs. power
BIAS CURRENT, initial
BIAS CURRENT, vs. supply
OFFSET CURRENT, initial
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
COMMON MODE VOLTAGE RANGE
COMMON MODE REJECTION, DC
INPUT NOISE
GAIN
OPEN LOOP, @ 15Hz
GAIN BANDWIDTH PRODUCT
POWER BANDWIDTH
PHASE MARGIN
OUTPUT
VOLTAGE SWING
VOLTAGE SWING
CURRENT, peak
SETTLING TIME to .1%
SLEW RATE
CAPACITIVE LOAD
RESISTANCE
POWER SUPPLY
VOLTAGE
CURRENT, quiescent, boost supply
CURRENT, quiescent, total
CURRENT, quiescent, total, shutdown
THERMAL
RESISTANCE, AC, junction to case3
RESISTANCE, DC, junction to case
RESISTANCE, junction to air4
TEMPERATURE RANGE, case
MIN
Full temperature range
Full temperature range
Full temperature range
Full temp. range, VCM = ±20V
100KHz BW, RS = 1KΩ
Full temperature range, CC = 82pF
RL = 10Ω
RL = 4Ω, VO = 80VP-P, AV = –10
CC = 82pF, RC = 120Ω
Full temperature range, CC = 470pF
IO = 20A
VBOOST = Vs + 5V, IO = 30A
AV = +1, 10V step, RL = 4Ω
AV = –10, CC = 82pF, RC = 120Ω
Full temperature range, AV = +1
IO = 0, No load, 2MHz
IO = 1A, 2MHz
Full temperature range
Full temperature range, F>60Hz
Full temperature range, F<60Hz
Full temperature range
Meets full range specification
±VB–8
90
94
PA05
TYP
5
20
10
30
10
.01
10
1011
13
100
10
102
3
400
60
±VS–9.5 ±VS–8.7
±VS–5.8 ±VS–5.0
30
2.5
80
100
2.2
5
2
±15
–25
±45
46
90
46
.3
.4
12
100V
SUPPLY VOLTAGE +20V
30A
250W
±20V
±VB
300°C
175°C
–65 to +150°C
–55 to +125°C
PA05A
MAX
MIN TYP
MAX
UNITS
10
2
5
50
10
30
30
*
*
10
50
5
20
*
50
5
20
*
*
*
*
*
*
mV
µV/°C
µV/V
µV/W
pA
pA/V
pA
Ω
pF
V
dB
µVrms
*
*
*
*
*
dB
MHz
kHz
*
*
*
*
*
*
*
*
*
*
V
V
A
µs
V/µs
nF
Ω
Ω
±50
*
56
120
56
*
*
*
*
*
*
*
*
.4
*
*
.5
*
*
*
85
*
*
°
V
mA
mA
mA
°C/W
°C/W
°C/W
°C
NOTES: * The specification of PA05A is identical to the specification for PA05 in applicable column to the left.
1. Unless otherwise noted: TC = 25°C, CC = 470pF, RC = 120 ohms. DC input specifications are ± value given. Power supply voltage is typical rating. ±VBOOST = ±VS.
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to
achieve high MTTF. For guidance, refer to the heatsink data sheet.
3. Rating applies if the output current alternates between both output transistors at a rate faster than 60 Hz.
4. The PA05 must be used with a heatsink or the quiescent power may drive the unit to junction temperatures higher than 150°C.
CAUTION
2
The PA05 is constructed from MOSFET transistors. ESD handling procedures must be observed.
The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or
subject to temperatures in excess of 850°C to avoid generating toxic fumes.
PA05U
PA05 • PA05A
POWER SUPPLY REJECTION, PSR (dB)
150
100
50
60
40
20
0
10
SMALL SIGNAL RESPONSE
CC = 220pf
40
CC = 470pf
100
1K 10K 100K 1M
FREQUENCY, F (Hz)
10M
–90
–225
10
CC = 470pF
5
2.5
0
NORMALIZED QUIESCENT CURRENT, IQ (X)
00
=3
120
110
100
90
80
70
60
25 50
–50 –25 0
75 100 125
CASE TEMPERATURE, TC (°C)
QUIESCENT CURRENT
POWER RESPONSE
100
1.2
1.1
1.0
.9
.8
20
CURRENT LIMIT
100
40
60
80
TOTAL SUPPLY VOLTAGE, VS (V)
60
40
20
10
F
30K
30
30
pF
3K 10K
300 1K
FREQUENCY, f (Hz)
25
5
10
15
20
25
OUTPUT CURRENT, IO (A)
0p
100
20
10
15
TIME, t (µs)
130
+ 5V
82
PO
5
0
= VS
F
.002
20
0
V
2
ST
BOO
22
0W
=
–7.5
4
0p
PO = 1W
.005
–5
= VS
47
.01
PA05U
10M
ST
V BOO
6
=
CC
AV = 10
RL = 2Ω
CC = 82pF, RC = 120Ω
VS = 31V
W
HARMONIC DISTORTION
.02
.001
30
1K 10K 100K 1M
FREQUENCY, F (Hz)
8
=
CC
.05
1M
OUTPUT VOLTAGE SWING
=
CC
DISTORTION, THD (%)
.1
10K 100K
100
1K
FREQUENCY, F (Hz)
O
.2
100
–2.5
20
20
100
200
300
400
500
EXT. COMPENSATION CAPACITOR CC (pF)
PULSE RESPONSE
7.5
OUTPUT VOLTAGE, VO (V)
40
P
COMMON MODE REJECTION, CMR (dB)
60
CC = 220pf
RL = 8Ω
RC = 120Ω
AV = +1
80
CC = 470pf
CC = 82pf
COMMON MODE REJECTION
0
10
CC = 470pf
–135
100
40
10
CC = 220pf
–180
20
60
12
CC = 82pf
60
80
10M
–45
CC = 82pf
0
10
1K 10K 100K 1M
FREQUENCY F (Hz)
PHASE RESPONSE
0
RL = 8Ω
RC = 120Ω
80
100
NORMALIZED CURRENT LIMIT, (%)
100
OPEN LOOP GAIN, A (dB)
80
25
50
75
100 125 150
CASE TEMPERATURE, TC (°C)
SLEW RATE vs. COMP
100
OUTPUT VOLTAGE, VO (VP-P)
0
POWER SUPPLY REJECTION
SLEW RATE SR (V/µS)
200
0
100
VOLTAGE DROP FROM SUPPLY, VS –VO (V)
POWER DERATING
250
PHASE, Ф (°)
INTERNAL POWER DISSIPATION, P (W)
P r o d u c t I n n o v a t i o nF r o m
6
4
2
40K
1M
.4M
100K
FREQUENCY, F (Hz)
4M
3
PA05 • PA05A
P r o d u c t I n n o v a t i o nF r o m
GENERAL
Please read Application Note 1 "General Operating Considerations" which covers stability, supplies, heat sinking,
mounting, current limit, SOA interpretation, and specification
interpretation. Visit www.cirrus.com for design tools that help
automate tasks such as calculations for stability, internal power
dissipation, current limit; heat sink selection; Apex Precision
Power’s complete Application Notes library; Technical Seminar
Workbook; and Evaluation Kits.
CURRENT LIMIT
The two current limit sense lines are to be connected directly
across the current limit sense resistor. For the current limit to
work correctly,pin 11 must be connected to the amplifier output
side and pin 10 connected to the load side of the current limit
resistor, RCL, as shown in Figure 1. This connection will bypass
any parasitic resistances, RP formed by sockets and solder
joints as well as internal amplifier losses. The current limiting
resistor may not be placed anywhere in the output circuit except
where shown in Figure 1. If current limiting is not used, pins 10
and 11 must be tied to pin 7.
The value of the current limit resistor can be calculated as
follows:
Rf
The output stage thermal protection circuit engages when
junction temperatures reach approximately 175C. If the condition
remains that caused the shutdown, the amplifier may oscillate
in and out of shutdown, creating high peak power stresses
reducing the reliability of the device.
SHUTDOWN OPERATION
To disable the output stage, pin 12 is connected to ground
via relay contacts or via an electronic switch. The switching
device must be capable of sinking 2mA to complete shutdown
and capable of standing off the supply voltage +VS. See Figure
2 for suggested circuits.
–LOGIC
K1
12 SHUTDOWN
A
12 SHUTDOWN
–LOGIC
Q1
470Ω
Ri
INPUT
1
10
B
11
CL
2 PA05
7
CL
FIGURE 2. SHUTDOWN OPERATION
RCL
RP
RL
ILIMIT = .7/RCL
FIGURE 1. CURRENT LIMIT
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational amplifier has two distinct limitations:
1. The current handling capability of the MOSFET geometry
and the wire bonds.
2. The junction temperature of the output MOSFETs.
NOTE: The output stage is protected against transient flyback. However, for protection against sustained, high energy
flyback, external fast-recovery diodes should be used.
SOA
30
D
C
15
12
9
C
0m
s
=
TC
°C
85
°C
25
=
TC
C
6
20
=
TC
D
D
5°
12
3
C
OUTPUT CURRENT (A)
t=
1.5
1.2
.9
.6
.3
4
1
2 3 4 5
10
20 30 40 50
100
SUPPLY TO OUTPUT DIFFERENTIAL (V)
From an internal circuitry standpoint, shutdown is just a
special case of current limit where the allowed output current
is zero. As with current limit, however, a small current does
flow in the output during shutdown. A load impedance of 100
ohms or less is required to insure the output transistors are
turned off. Note that even though the output transistors are off
the output pin is not open circuited because of the shutdown
operating current.
BOOST OPERATION
With the VBOOST feature, the small signal stages of the amplifier are operated at higher supply voltages than the amplifier’s
high current output stage. +VBOOST (pin 9), and –VBOOST (pin
5) are connected to the small signal circuitry of the amplifier.
+VS (pin 8) and –VS (pin 6) are connected to the high current
output stage. An additional 5V on the VBOOST pins is sufficient
to allow the small signal stages to drive the output transistors
into saturation and improve the output voltage swing for extra
efficient operation when required. When close swings to the
supply rails is not required the +VBOOST and +VS pins must be
strapped together as well as the –VBOOST and –VS pins.The boost
voltage pins must not be at a voltage lower than the VS pins.
COMPENSATION
The external compensation components CC and RC are connected to pins 3 and 4. Unity gain stability can be achieved
at any compensation capacitance greater than 470 pF with at
least 60 degrees of phase margin. At higher gains, more phase
shift can be tolerated in most designs and the compensation
capacitance can accordingly be reduced, resulting in higher
bandwidth and slew rate. Use the typical operating curves as
a guide to select CC and RC for the application.
PA05U
P r o d u c t I n n o v a t i o nF r o m
PA05 • PA05A
Contacting Cirrus Logic Support
For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact [email protected]
International customers can also request support by contacting their local Cirrus Logic Sales Representative.
To find the one nearest to you, go to www.cirrus.com
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PA05U
5