®
High-Voltage, High-Current
OPERATIONAL AMPLIFIER
OPA544
FEATURES
● HIGH OUTPUT CURRENT: 2A min
● WIDE POWER SUPPLY RANGE:
±10 to ±35V
● SLEW RATE: 8V/µs
● INTERNAL CURRENT LIMIT
● THERMAL SHUTDOWN PROTECTION
● FET INPUT: I
● 5-LEAD TO-220 PLASTIC PACKAGE
● 5-LEAD SURFACE MOUNT PACKAGE
= 100pA max
B
APPLICATIONS
● MOTOR DRIVER
● PROGRAMMABLE POWER SUPPLY
● SERVO AMPLIFIER
● VALVES, ACTUATOR DRIVER
● MAGNETIC DEFLECTION COIL DRIVER
● AUDIO AMPLIFIER
Tab is connected
to V– supply.
5-Lead TO-220
and
Stagger-Formed
TO-220
DESCRIPTION
The OPA544 is a high-voltage/high-current operational amplifier suitable for driving a wide variety of
high power loads. High performance FET op amp
circuitry and high power output stage are combined on
a single monolithic chip.
The OPA544 is protected by internal current limit and
thermal shutdown circuits.
The OPA544 is available in industry-standard
5-lead TO-220 and 5-lead surface-mount power packages. Its copper tab allows easy mounting to a heat
sink for excellent thermal performance. It is specified
for operation over the extended industrial temperature
range, –40°C to +85°C.
Tab is connected
to V– supply.
5-Lead
Surface Mount
1234
1234
+
V
IN
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
5
V–
V+
–
V
V
IN
O
+
V
IN
5
V–
V+
–
V
V
IN
O
©1994 Burr-Brown Corporation PDS-1250B Printed in U.S.A. September, 1995
SPECIFICATIONS
At T
= +25°C, VS = ±35V, unless otherwise noted.
CASE
OPA544T
OPA544T-1
OPA544F
PARAMETER CONDITION MIN TYP MAX UNITS
OFFSET VOLTAGE
Input Offset Voltage ±1 ±5mV
vs Temperature Specified Temperature Range ±10 µV/°C
vs Power Supply V
INPUT BIAS CURRENT
(1)
Input Bias Current V
vs Temperature See Typical Curve
Input Offset Current V
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
INPUT IMPEDANCE
Differential 10
Common-Mode 10
OPEN-LOOP GAIN
Open-Loop Voltage Gain V
FREQUENCY RESPONSE
Gain Bandwidth Product R
Slew Rate 60Vp-p, R
Full-Power Bandwidth See Typical Curve
Settling Time 0.1% G = –10, 60V Step 25 µs
Total Harmonic Distortion See Typical Curve
OUTPUT
Voltage Output, Positive I
Negative I
Positive I
Negative I
Current Output See SOA Curves
Short-Circuit Current 4A
POWER SUPPLY
Specified Operating Voltage ±35 V
Operating Voltage Range ±10 ±35 V
Quiescent Current I
TEMPERATURE RANGE
Operating –40 +85 °C
Storage –40 +125 °C
Thermal Resistance,
Thermal Resistance,
Thermal Resistance,
NOTES: (1) High-speed test at T
θ
JC
θ
JC
θ
JA
= 25°C.
J
= ±10V to ±35V ±10 ±100 µV/V
S
= 0V ±15 ±100 pA
CM
= 0V ±10 ±100 pA
CM
= ±VS –6V 90 106 dB
CM
12
|| 8 Ω || pF
12
|| 10 Ω || pF
= ±30V, RL = 1kΩ 90 103 dB
O
= 15Ω 1.4 MHz
L
= 15Ω 58 V/µs
L
= 2A (V+) –5 (V+) –4.4 V
O
= 2A (V–) +5 (V–) +3.8 V
O
= 0.5A (V+) –4.2 (V+) –3.8 V
O
= 0.5A (V–) +4 (V–) +3.1 V
O
= 0 ±12 ±15 mA
O
f > 50Hz 2.7 °C/W
DC 3 °C/W
No Heat Sink 65 °C/W
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.
®
2OPA544
CONNECTION DIAGRAMS
PACKAGE /ORDERING INFORMATION
Top View
5-Lead TO-220
and
Stagger-Formed
TO-220
Tab is connected
to V– supply.
1234
+
V
IN
5
V–
V+
–
V
V
IN
O
Tab is connected
to V– supply.
1234
+
V
IN
5
V–
V+
–
V
V
IN
O
5-Lead
Surface Mount
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V+ to V– ................................................................... 70V
Output Current ................................................................. See SOA Curve
Input Voltage .................................................... (V–) –0.7V to (V+) +0.7V
Operating Temperature ................................................. –40°C to +125°C
Storage Temperature ..................................................... –40°C to +125°C
Junction Temperature...................................................................... 150°C
Lead Temperature (soldering –10s)
NOTE: (1) Vapor-phase or IR reflow techniques are recommended for soldering the OPA544F surface mount package. Wave soldering is not recommended
due to excessive thermal shock and “shadowing” of nearby devices.
(1)
...............................................................
300°C
PRODUCT PACKAGE NUMBER
PACKAGE DRAWING
OPA544T 5-Lead TO-220 315
OPA544T-1 5-Lead Stagger-Formed TO-220 323
OPA544F 5-Lead Surface-Mount 325
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
(1)
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 degradation 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.
®
3
OPA544
TYPICAL PERFORMANCE CURVES
At T
= +25°C, VS = ±35V, unless otherwise noted.
CASE
120
100
Gain (dB)
–20
Limit Current (A)
OPEN-LOOP GAIN AND PHASE vs FREQUENCY
80
60
40
20
0
1 10 100 1k 10k 100k 1M 10M
Frequency (Hz)
CURRENT LIMIT vs TEMPERATURE
5
4
3
2
1
RL = 15Ω
0
–45
–90
–135
–180
10n
100p
Phase (°)
10p
Input Bias Current (A)
Quiescent Current (mA)
INPUT BIAS CURRENT vs TEMPERATURE
1n
I
B
I
OS
1p
–75 –50 –25 0 25 50 75 100 125
Temperature (°C)
13
12
11
10
QUIESCENT CURRENT vs TEMPERATURE
VS = ±35V
VS = ±10V
0
–75 –50 –25 0 25 50 75 100 125
Temperature (°C)
VOLTAGE NOISE DENSITY vs FREQUENCY
100
80
60
40
20
Voltage Noise (nV/√Hz)
10
1 10 100 1k 10k 100k
Frequency (Hz)
®
9
–75 –50 –25 0 25 50 75 100 125
110
100
90
80
70
60
50
Common-Mode Rejection (dB)
40
100 1k 10k 100k 1M
4OPA544
Temperature (°C)
COMMON-MODE REJECTION vs FREQUENCY
Frequency (Hz)
TYPICAL PERFORMANCE CURVES (CONT)
At T
= +25°C, VS = ±35V, unless otherwise noted.
CASE
120
100
Power Supply Rejection (dB)
Output Voltage (V)
POWER SUPPLY REJECTION vs FREQUENCY
V+ Supply
80
60
40
20
1 10 100 1k 10k 100k 1M
35
Clipping
30
25
20
15
10
5
0
20k 100k 200k
V– Supply
Frequency (Hz)
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
Slew Rate
Limited
Frequency (Hz)
GAIN-BANDWIDTH PRODUCT AND SLEW RATE
2.5
2.0
1.5
1.0
Gain-Bandwidth Product (MHz)
0.5
–75 –50 –25 0 25 50 75 100 125
TOTAL HARMONIC DISTORTION + NOISE
10
1
0.1
THD + N (%)
0.01
0.001
20 100
vs TEMPERATURE
Temperature (°C)
vs FREQUENCY
RL = 15Ω
Frequency (Hz)
GBW
SR+
SR–
100mW
2W
30W
1k
10k 20k
9
8
Slew Rate (V/µS)
7
6
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
5
4
| (V)
3
OUT
| – |V
2
SUPPLY
|V
1
0
012 3
(V+) – V
O
|(V–) –VO|
Output Current (A)
OUTPUT VOLTAGE SWING vs TEMPERATURE
6
5
| (V)
4
OUT
3
| – |V
2
SUPPLY
|V
1
0
–75 –50 –25 0 25 50 75 100 125
5
IO = +2A
IO = –2A
IO = +0.5A
IO = –0.5A
Temperature (°C)
®
OPA544
TYPICAL PERFORMANCE CURVES (CONT)
At T
= +25°C, VS = ±35V, unless otherwise noted.
CASE
SMALL SIGNAL RESPONSE
200MV/div
G = 3, C
2µs/div
= 1nF
L
APPLICATIONS INFORMATION
Figure 1 shows the OPA544 connected as a basic noninverting amplifier. The OPA544 can be used in virtually
any op amp configuration. Power supply terminals should be
bypassed with low series impedance capacitors. The technique shown, using a ceramic and tantalum type in parallel
is recommended. Power supply wiring should have low
series impedance and inductance.
+35V
V+
10µF
+
0.1µF
R
1
5kΩ
V
IN
R
10kΩ
OPA544
0.1µF
10µF
R
2
G = 1+ = 3
R
1
2
+
V
O
Z
L
5V/div
The safe output current decreases as VS–VO increases. Output
short-circuits are 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
= ±35V the safe output current
S
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 OPA544. For further insight on SOA,
consult Application Bulletin AB-039.
10
4
Output current may
be limited to less
1
than 4A—see text.
0.4
Output Current (A)
0.1
12 510
SAFE OPERATING AREA
Current-Limited
TC = 85°C
TC = 125°C
20 50 100
– VO| (V)
|V
S
TC = 25°C
FIGURE 2. Safe Operating Area.
V–
–35V
FIGURE 1. Basic Circuit Connections.
SAFE OPERATING AREA
Stress on the output transistors is determined by the output
current and the voltage across the conducting output transistor, V
. The power dissipated by the output transistor is
S–VO
equal to the product of the output current and the voltage
across the conducting transistor, VS–VO. The Safe Operating
Area (SOA curve, Figure 2) shows the permissible range of
voltage and current.
®
CURRENT LIMIT
The OPA544 has an internal current limit set for approximately 4A. This current limit decreases with increasing
junction temperature as shown in the typical curve, Current
Limit vs 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.
6OPA544
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 conducting output transistor. Power dissipation can be minimized 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 dissipation 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 mounting tab of the surface-mount package version
should be soldered to a circuit board copper area for good
heat dissipation. Figure 3 shows typical thermal resistance
from junction to ambient as a function of the copper area.
THERMAL PROTECTION
The OPA544 has thermal shutdown that protects the amplifier 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 (including heat
sink), increase the ambient temperature until the thermal
protection is activated. Use worst-case load and signal conditions. For good reliability, the thermal protection should
trigger more than 25˚C above the maximum expected ambient condition of your application. This produces a junction
temperature of 125˚C at the maximum expected ambient
condition.
Depending on load and signal conditions, the thermal protection 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 depending on whether internal dissipation is produced by
sourcing or sinking output current.
OUTPUT STAGE COMPENSATION
The complex load impedances common in power op amp
applications can cause output stage instability. Figure 3
shows an output series R/C compensation network (1Ω in
series with 0.01µF) which generally provides excellent stability. Some variation in circuit values may be required with
certain loads.
UNBALANCED POWER SUPPLIES
Some applications do not require equal positive and negative
output voltage swing. The power supply voltages of the
OPA544 do not need to be equal. For example, a –6V
negative power supply voltage assures that the inputs of the
OPA544 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 65V. The total voltage (V–
to V+) can range from 20V to 70V. With a 65V positive
supply voltage, the device may not be protected from damage during short-circuits because of the larger V
during
CE
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 4. Fast-recovery rectifier
diodes with a 4A or greater continuous rating are recommended.
THERMAL RESISTANCE vs
50
40
(°C/W)
JA
30
20
10
Thermal Resistance, θ
0
012345
CIRCUIT BOARD COPPER AREA
OPA544F
Surface Mount Package
1oz copper
2
Copper Area (inches
)
FIGURE 3. Thermal Resistance vs Circuit Board Copper Area.
Circuit Board Copper Area
OPA544
Surface Mount Package
®
7
OPA544
FIGURE 4. Motor Drive Circuit.
V+
R
R
1
5kΩ
V
IN
OPA544
R
20kΩ
2
D
2
2
G = – = –4
R
1
D
1
1Ω
Motor
0.01µF
V–
D1, D2 : Motorola MUR420 Fast Recovery Rectifier.
+30V
REF102
10V
+5V
8-bit
data port
(8 + 4 bits)
0-1mA
10kΩ
OPA602
DAC7801
12-bit
M-DAC
FIGURE 5. Digitally Programmable Power Supply.
20pF
20kΩ
10kΩ
4.7kΩ
470pF
+30V
OPA544
–30V
40kΩ
10Ω
1µH
1Ω
0.01µF
Output series L/R
network helps assure
stability with very high
capacitance loads.
V
O
±20V
at 2A
®
8OPA544
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