1
OPA2544
High-Voltage, High-Current
DUAL OPERATIONAL AMPLIFIER
FEATURES
q
HIGH OUTPUT CURRENT: 2A min
q
WIDE POWER SUPPLY RANGE:
10V to
35V
q
SLEW RATE: 8V/
s
q
INTERNAL CURRENT LIMIT
q
THERMAL SHUTDOWN PROTECTION
q
FET INPUT: I
B
= 50pA max
q
11-LEAD PLASTIC PACKAGE
APPLICATIONS
q
MOTOR DRIVER
q
PROGRAMMABLE POWER SUPPLY
q
SERVO AMPLIFIER
q
VALVES, ACTUATOR DRIVER
q
MAGNETIC DEFLECTION COIL DRIVER
q
AUDIO AMPLIFIER
DESCRIPTION
The OPA2544 is a dual high-voltage/high-current op-
erational amplifier suitable for driving a wide variety
of high power loads. It provides 2A output current and
power supply voltage range extends to
35V.
The OPA2544 integrates two high performance FET
op amps with high power output stages on a single
monolithic chip. Internal current limit and thermal
shutdown protect the amplifier and load from damage.
The OPA2544 is available in a 11-lead plastic
packages and is specified for the 40
C to +85
C
temperature range.
OPA2544
FPO
International Airport Industrial Park Mailing Address: PO Box 11400, Tucson, AZ 85734 Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 Tel: (520) 746-1111 Twx: 910-952-1111
Internet: http://www.burr-brown.com/ FAXLine: (800) 548-6133 (US/Canada Only) Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
1
11
NC
V+
V
A
Case
connected
to V Supply.
B
1994 Burr-Brown Corporation
PDS-1249C
Printed in U.S.A. March, 1998
2
OPA2544
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
SPECIFICATIONS
At T
CASE
= +25
C and V
S
=
35V, unless otherwise noted.
OPA2544T
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
OFFSET VOLTAGE
Input Offset Voltage
1
5
mV
vs Temperature
Specified Temp. Range
10
V/
C
vs Power Supply
V
S
=
10V to
35V
10
100
V/V
INPUT BIAS CURRENT
(1)
Input Bias Current
V
CM
= 0V
15
50
pA
vs Temperature
Doubles every 10C
Input Offset Current
V
CM
= 0V
10
50
pA
NOISE
Input Voltage Noise
Noise Density, f = 1kHz
36
nV/
Hz
Current Noise Density, f = 1kHz
3
fA/
Hz
INPUT VOLTAGE RANGE
Common-Mode Input Range
Positive
Linear Operation
(V+) 6
(V+) 4
V
Negative
Linear Operation
(V) +6
(V) +4
V
Common-Mode Rejection
V
CM
=
V
S
6V
90
106
dB
INPUT IMPEDANCE
Differential
10
12
|| 8
|| pF
Common-Mode
10
12
|| 10
|| pF
OPEN-LOOP GAIN
Open-Loop Voltage Gain
V
O
=
30V, R
L
= 15
90
103
dB
FREQUENCY RESPONSE
Gain-Bandwidth Product
R
L
= 15
1.4
MHz
Slew Rate
60Vp-p, R
L
= 15
5
8
V/
s
Full-Power Bandwidth
See Typical Curve
Settling Time 0.1%
G = 10, 60V Step
25
s
Total Harmonic Distortion
See Typical Curve
OUTPUT
Voltage Output: Positive
I
O
= 2A
(V+) 5
(V+) 4.4
V
Negative
I
O
= 2A
(V) +5
(V) +3.8
V
Positive
I
O
= 0.5A
(V+) 4.2
(V+) 3.8
V
Negative
I
O
= 0.5A
(V) +4
(V) +3.1
V
Current Output
See SOA Curves
Short-Circuit Current
4
A
POWER SUPPLY
Specified Operating Voltage
35
V
Operating Voltage Range
10
35
V
Quiescent Current (total)
I
O
= 0
22
30
mA
TEMPERATURE RANGE
Operating Range
40
+85
C
Storage
40
+125
C
Thermal Resistance,
JC
2
Both Amplifiers, f > 50Hz
2
C/W
Thermal Resistance,
JC
2
Both Amplifiers, DC
2.5
C/W
Thermal Resistance,
JC
2
One Amplifier, f > 50Hz
2.7
C/W
Thermal Resistance,
JC
2
One Amplifier, DC
3
C/W
Thermal Resistance,
JA
2
No Heat Sink
30
C/W
NOTES: (1) High-speed test at T
J
= +25
C. (2) Calculated from total power dissipation of both amplifiers.
3
OPA2544
CONNECTION DIAGRAM
Front View
11-Lead Plastic
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Voltage, V+ to V ................................................................... 70V
Output Current ................................................................. See SOA Curve
Input Voltage .................................................... (V) 0.7V to (V+) +0.7V
Operating Temperature ................................................. 55
C to +125
C
Storage Temperature ..................................................... 40
C to +125
C
Junction Temperature ...................................................................... 150
C
Lead Temperature (soldering, 10s) ............................................... 300
C
NOTE: (1) Stresses above these ratings may cause permanent damage.
PACKAGE/ORDERING INFORMATION
PACKAGE
DRAWING
TEMPERATURE
PRODUCT
PACKAGE
NUMBER
(1)
RANGE
OPA2544T
11-Lead Plastic
242
40
C to +85
C
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degrada-
tion to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.
1
11
NC
V+
V
A
Case
connected
to V Supply.
B
4
OPA2544
TYPICAL PERFORMANCE CURVES
At T
CASE
= +25
C, V
S
=
35V, unless otherwise noted.
1
10
100
1k
10k
100k
1M
10M
Gain (dB)
Frequency (Hz)
OPEN-LOOP GAIN AND PHASE vs FREQUENCY
120
100
80
60
40
20
0
20
Phase ()
0
45
90
135
180
R
L
= 15
75
50
25
0
25
50
75
100
125
Input Bias Current (A)
Temperature (C)
INPUT BIAS CURRENT vs TEMPERATURE
10n
1n
100p
10p
1p
I
OS
I
B
75
50
25
0
25
50
75
100
125
Limit Current (A)
Temperature (C)
CURRENT LIMIT vs TEMPERATURE
5
4
3
2
1
0
1
10
100
1k
10k
100k
10
Voltage Noise (nV/ Hz)
Frequency (Hz)
VOLTAGE NOISE DENSITY vs FREQUENCY
20
40
60
80
100
CHANNEL CROSSTALK vs FREQUENCY
0
20
40
60
80
100
120
Crosstalk (dB)
10
100
1k
10k
100k
1M
Frequency (Hz)
15
1k
9k
V
X
1k
9k
75
50
25
0
25
50
75
100
125
Quiescent Current (mA)
Temperature (C)
QUIESCENT CURRENT vs TEMPERATURE
26
24
22
20
18
V
S
= 35V
V
S
= 10V
5
OPA2544
TYPICAL PERFORMANCE CURVES
(CONT)
At T
CASE
= +25
C and V
S
=
35V, unless otherwise noted.
100
1k
10k
100k
1M
Common-Mode Rejection (dB)
Frequency (Hz)
COMMON-MODE REJECTION vs FREQUENCY
110
100
90
80
70
60
50
40
1
10
100
1k
10k
100k
1M
Power Supply Rejection (dB)
Frequency (Hz)
POWER SUPPLY REJECTION vs FREQUENCY
120
100
80
60
40
20
V+ Supply
V Supply
75
50
25
0
25
50
75
100
125
Gain-Bandwidth Product (MHz)
Temperature (C)
GAIN-BANDWIDTH PRODUCT AND SLEW RATE
vs TEMPERATURE
2.5
2.0
1.5
1.0
0.5
Slew Rate (V/S)
9
8
7
6
SR
SR+
TOTAL HARMONIC DISTORTION + NOISE
vs FREQUENCY
10
1
0.1
0.01
0.001
20
100
1k
10k 20k
THD + N (%)
Frequency (Hz)
R
L
= 15
100mW
2W
30W
35
30
25
20
15
10
5
0
Output Voltage (V)
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
Frequency (Hz)
20k
100k
200k
Clipping
Slew Rate
Limited
0
1
2
3
|V
SUPPLY
| |V
OUT
| (V)
Output Current (A)
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
5
4
3
2
1
0
|(V) V
O
|
(V+) V
O
6
OPA2544
TYPICAL PERFORMANCE CURVES
(CONT)
At T
CASE
= +25
C and V
S
=
35V, unless otherwise noted.
200mV/div
SMALL SIGNAL RESPONSE
G = 3, C
L
= 1nF
2s/div
75
50
25
0
25
50
75
100
125
|V
SUPPLY
| |V
OUT
| (V)
Temperature (C)
OUTPUT VOLTAGE SWING vs TEMPERATURE
6
5
4
3
2
1
0
I
O
= 2A
I
O
= +0.5A
I
O
= +2A
I
O
= 0.5A
LARGE SIGNAL RESPONSE
G = 3, R
L
= 15
5s/div
5V/div
7
OPA2544
APPLICATIONS INFORMATION
Figure 1 shows the OPA2544 connected as a basic non-
inverting amplifier. The OPA2544 can be used in virtually
any op amp configuration. Power supply terminals should be
bypassed with low series impedance capacitors. The tech-
nique shown, using a ceramic and tantalum type in parallel,
is recommended. Power supply wiring should have low
series impedance and inductance.
FIGURE 1. Basic Circuit Connections.
G = 1+ = 3
R
2
R
1
+
Z
L
V
O
R
2
10k
R
1
5k
0.1F
10F
1/2
OPA2544
V
35V
+35V
V+
V
IN
+
10F
0.1F
SAFE OPERATING AREA
Stress on the output transistors is determined by the output
current and the voltage across the conducting output transis-
tor, V
CE
. The power dissipated by the output transistor is
equal to the product of the output current and the voltage
across the conducting transistor, V
CE
. The Safe Operating
Area (SOA curve, Figure 2) shows the permissible range of
voltage and current.
1
2
5
10
|V
S
V
O
| (V)
20
50
100
SAFE OPERATING AREA
10
4
1
Output Current (A) 0.4
0.1
Current-Limited
T
C
= 25C
T
C
= 125C
T
C
= 85C
Output current may
be limited to less
than 4A--see text.
FIGURE 2. Safe Operating Area.
The safe output current decreases as V
CE
increases. Output
short-circuit is a very demanding case for SOA. A short-
circuit to ground forces the full power supply voltage (V+
or V) across the conducting transistor. With V
S
=
35V
the safe output current is 1.5A (at 25
C). The short-circuit
current is approximately 4A which exceeds the SOA. This
situation will activate the thermal shutdown circuit in the
OPA2544. For further insight on SOA, consult AB-039.
CURRENT LIMIT
The OPA2544 has an internal current limit set for approxi-
mately 4A. This current limit decreases with increasing
junction temperature as shown in the typical curve, Current
Limit versus Temperature. This, in combination with the
thermal shutdown circuit, provides protection from many
types of overload. It may not, however, protect for short-
circuit to ground, depending on the power supply voltage,
ambient temperature, heat sink and signal conditions.
POWER DISSIPATION
Power dissipation depends on power supply, signal and load
conditions. For DC signals, power dissipation is equal to the
product of output current times the voltage across the con-
ducting output transistor. Power dissipation can be mini-
mized by using the lowest possible power supply voltage
necessary to assure the required output voltage swing.
For resistive loads, the maximum power dissipation occurs
at a DC output voltage of one-half the power supply voltage.
Dissipation with AC signals is lower. Application Bulletin
AB-039 explains how to calculate or measure power dissi-
pation with unusual signals and loads.
HEATSINKING
Most applications require a heat sink to assure that the
maximum junction temperature is not exceeded. The heat
sink required depends on the power dissipated and on
ambient conditions. Consult Application Bulletin AB-038
for information on determining heat sink requirements.
The heat sink tab of the plastic package is connected to the
V power supply terminal. Lowest thermal resistance can be
achieved by mounting the tab directly to a heat sink. If the
heat sink cannot be electrically "hot" at V power supply
potential, insulating hardware must be used.
THERMAL PROTECTION
The OPA2544 has thermal shutdown that protects the ampli-
fier from damage. Any tendency to activate the thermal
shutdown circuit during normal operation is indication of
excessive power dissipation or an inadequate heat sink.
The thermal protection activates at a junction temperature
of approximately 155
C. For reliable operation, junction
temperature should be limited to 150
C, maximum. To
estimate the margin of safety in a complete design (includ-
ing heat sink), increase the ambient temperature until the
thermal protection is activated. Use worst-case load and
signal conditions. For good reliability, the thermal protec-
8
OPA2544
tion should trigger more than 25
C above the maximum
expected ambient condition of your application. This pro-
duces a junction temperature of 125
C at the maximum
expected ambient condition.
Depending on load and signal conditions, the thermal pro-
tection circuit may produce a duty-cycle modulated output
signal. This limits the dissipation in the amplifier, but the
rapidly varying output waveform may be damaging to some
loads. The thermal protection may behave differently de-
pending on whether internal dissipation is produced by
sourcing or sinking output current.
UNBALANCED POWER SUPPLIES
Some applications do not require equal positive and negative
output voltage swing. The power supply voltages of the
OPA2544 do not need to be equal. For example, a 7V
negative power supply voltage assures that the inputs of the
OPA2544 are operated within their linear common-mode
range, and that the output can swing to 0V. The V+ power
supply could range from 15V to 63V. The total voltage
(V to V+) can range from 20V to 70V. With a 63V positive
supply voltage, the device may not be protected from dam-
age during short-circuits because of the larger V
CE
during
this condition.
OUTPUT PROTECTION
Reactive and EMF-generating loads can return load current
to the amplifier, causing the output voltage to exceed the
power supply voltage. This damaging condition can be
avoided with clamp diodes from the output terminal to the
power supplies as shown in Figure 2. Fast-recovery rectifier
diodes with a 4A or greater continuous rating are recom-
mended.
FIGURE 4. Bridge Drive Circuit.
3nF
B
1k
10k
10k
A
20k
G = 1
30
Load
10k
G = +3
V
IN
10V
35V
+35V
35V
+35V
120Vp-p
(60V)
FIGURE 3. Motor Drive Circuit.
FIGURE 5. Paralleled Operation, Extended SOA.
G = = 4
R
2
R
1
1
0.01F
R
2
20k
R
1
5k
1/2
OPA2544
V
V+
V
IN
Motor
D
1
D
2
D
1
, D
2
: Motorola MUR420
Fast Recovery Rectifier.
A
V
= R
2
/R
1
= 10
20pF
Paralleled operation not
recommended for input
signals that can cause
amplifiers to slew.
L
20pF
R
2
100k
R
1
10k
0.1
10k
0.1
B
Slave
A
Master
V
IN
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