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High Current--High Power
OPERATIONAL AMPLIFIER
FEATURES
APPLICATIONS
1985 Burr-Brown Corporation
PDS-599A
Printed in U.S.A. December, 1993
OPA511
DESCRIPTION
q
WIDE SUPPLY RANGE:
10V to
30V
q
SERVO AMPLIFIER
q
HIGH OUTPUT CURRENT: 5A Peak
q
MOTOR DRIVER
q
CLASS A/B OUTPUT STAGE:
q
SYNCRO EXCITATION
Low Distortion
q
AUDIO AMPLIFIER
q
SMALL TO-3 PACKAGE
q
TEST PIN DRIVER
Out
R
CL+
R
CL
8
1
2
Current
Limit
Bias
Circuit
4
6
V
S
3
V
S
5
providing excellent low-level signal fidelity and
high output voltage swing. The reduced internal parts
count made possible with this bias IC improves
performance and reliability.
This hybrid integrated circuit is housed in a hermeti-
cally sealed TO-3 package and all circuitry is electri-
cally isolated from the case. This allows direct mount-
ing to a chassis or heat sink without cumbersome
insulating hardware and provides optimum heat trans-
fer.
The OPA511 is a high voltage, high current opera-
tional amplifier designed to drive a wide variety of
resistive and reactive loads. Its complementary class
A/B output stage provides superior performance in
applications requiring freedom from cross-over
distortion. User-set current limit circuitry provides
protection to the amplifier and load in fault conditions.
The OPA511 employs a laser-trimmed monolithic
integrated circuit to bias the output transistors,
OPA511
2
NOTES: (1) +V
S
and V
S
denote the positive and negative supply voltage respectively. Total V
S
is measured from +V
S
to V
S
. (2) SOA = Safe Operating Area.
(3) Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz.
INPUT
OFFSET VOLTAGE
Initial Offset
5
10
mV
vs Temperature
Full Temperature Range
10
65
V/
C
vs Supply Voltage
35
200
V/V
vs Power
20
V/W
BIAS CURRENT
Initial
15
40
nA
vs Temperature
Full Temperature Range
0.05
0.4
nA/
C
vs Supply voltage
0.02
nA/V
OFFSET CURRENT
Initial
5
10
nA
vs Temperature
Full Temperature Range
0.01
nA/
C
INPUT IMPEDANCE
Common Mode
200
M
Differential
10
M
VOLTAGE RANGE
(1)
Common-Mode Voltage
Full Temperature Range
(|V
S
| 6)
(|V
S
| 3)
V
Common-Mode Rejection
V
CM
= V
S
6V
70
110
dB
GAIN
Open-Loop Gain at 10Hz
Full Temperature Range, full load
91
113
dB
Gain-Bandwidth Product at 1MHz
T
C
= +25
C, full load
1
MHz
Power Bandwidth
T
C
= +25
C, I
O
= 4A, V
O
= 40Vp-p
15
23
kHz
Phase Margin
Full Temperature Range
45
Degrees
OUTPUT
Voltage Swing
I
O
= 5A
(|V
S
| 8)
(|V
S
| 5)
V
Full Temperature Range, I
O
= 2A
(|V
S
| 6)
(|V
S
| 5)
V
Full Temperature Range, I
O
= 56mA
(|V
S
| 5)
V
Current, Peak
5
A
Settling Time to 0.1%
2V step
2
s
Slew Rate
R
L
= 2.5
1.0
1.8
V/
s
Capacitive Load: Unity Gain
Full Temperature Range
3.3
nF
Gain>4
Full Temperature Range
SOA
(2)
POWER SUPPLY
Voltage
Full Temperature Range
10
28
30
V
Current, Quiescent
20
30
mA
THERMAL RESISTANCE
AC Junction to Case
(3)
f > 60Hz
1.9
2.1
C/W
DC Junction to Case
f > 60Hz
2.4
2.6
C/W
Junction to Air
30
C/W
TEMPERATURE RANGE
Case
25
+85
C
OPA511AM
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
SPECIFICATIONS
ELECTRICAL
At T
C
= +25
C and V
S
=
28VDC unless otherwise noted.
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.
OPA511
3
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, +V
S
to V
S
.................................................................. 68V
Output Current: Source .......................................................................... 5A
Sink ..................................................................... see SOA
Power Dissipation, internal
(1)
............................................................... 67W
Input Voltage: Differential .........................................................
(|V
S
| 3V)
Common-mode .............................................................
V
S
Temperature: Junction
(1)
................................................................ +200
C
Pin solder(10s) ........................................................ +300
C
Temperature Range: Storage ......................................... 65
C to +150
C
Operating (case) ............................. 25
C to +85
C
PIN CONFIGURATION
Top View
NOTE: (1) Long term operation at the maximum junction temperature will
result in reduced product life. Derate internal power dissipation to achieve
high MTTF.
ORDERING INFORMATION
A
B
E
C
K
D
Seating Plane
H
J
F
R
Q
G
1
2
3
4
5
6
7
8
M Package -- 8-Pin Metal TO-3
MECHANICAL
INCHES
MILLIMETERS
DIM
MIN
MAX
MIN
MAX
A
1.510
1.550
38.35
39.37
B
.745
.770
18.92
19.56
C
.260
.300
6.60
7.62
D
.038
.042
0.97
1.07
E
.080
.105
2.03
2.67
F
40
BASIC
40
BASIC
G
.500 BASIC
12.70 BASIC
H
1.182
1.192
30.02
30.28
J
.591
.596
15.01
15.14
K
.400
.500
10.16
12.70
Q
.151
.161
3.84
4.09
R
.980
1.020
24.89
25.91
NOTE: Leads in true
position within 0.01"
(0.25mm) R at MMC
at seating plane. Pin
numbers shown for
reference only.
Numbers may not
be marked on
package.
TEMPERATURE
MODEL
PACKAGE
RANGE
OPA511AM
TO-3
25
C to +85
C
2
3
4
1
8
7
5
6
Current
Limit (R
CL
)
Output
+In
In
V
S
No Internal
Connection
+V
S
+Current
Limit (+R
CL
)
OPA511
4
TYPICAL PERFORMANCE CURVES
T
A
= +25
C, V
S
=
28VDC unless otherwise noted.
70
60
50
40
30
20
10
0
0
20
40
60
80
100
120
140
Temperature, T (C)
Internal Power Dissipation, P (W)
POWER DERATING
T = T
C
T = T
A
3.5
3.0
2.5
2.0
1.5
1.0
0.5
50
0
25
0
25
50
75
100
125
Case Temperature, T
C
(C)
Current Limit, I
LIM
(A)
CURRENT LIMIT
R
CL
= 0.6
R
CL
= 0.3
0
30
60
90
120
150
180
210
1
10
100
1k
10k
100k
1M
10M
Frequency, f (Hz)
Phase
(Degrees)
PHASE RESPONSE
120
100
80
60
40
20
0
20
1
10
100
1k
10k
100k
1M
10M
Frequency, f (Hz)
Open Loop Gain, A (dB)
SMALL SIGNAL RESPONSE
Output Voltage, V
O
(V pp)
100
68
46
32
22
15
10
6.8
4.6
10
20
30
50
70
100
POWER RESPONSE
Frequency, f (kHz)
|+V
S
| + |V
S
| = 60V
2.8
2.5
2.2
1.9
1.6
1.3
1.0
50
0.7
25
0
25
50
75
100
125
Case Temperature, T
C
(C)
Normalized Bias Current, I
B
BIAS CURRENT
OPA511
5
TYPICAL PERFORMANCE CURVES
(CONT)
T
A
= +25
C, V
S
=
28VDC unless otherwise noted.
8
6
4
2
0
2
4
6
8
Time, t (s)
Output Voltage, V
O
(V)
PULSE RESPONSE
0
2
4
6
8
10
12
V
IN
= 5V, t
R
= 100ns
2
14
QUIESCENT CURRENT
Total Supply Voltage, V
S
(V)
1.3
1.2
1.1
1.0
0.9
0.8
0.7
Normalized, I
Q
20
30
40
50
60
70
80
+85C
25C to +25C
INPUT NOISE
Input Noise Voltage, V
N
(nV/
Hz)
100
70
50
40
30
20
10
10
100
1k
10k
100k
Frequency, f (Hz)
COMMON-MODE REJECTION
Frequency, f (Hz)
120
100
80
60
40
20
0
Common-Mode Rejection,CMR(dB)
1
10
100
1k
10k
100k
1M
HARMONIC DISTORTION
Frequency, f (Hz)
3
1
0.3
0.1
0.03
0.01
0.003
Distortion (%)
100
300
1k
3k
10k
30k
100k
V
S
= 28V
R
L
= 8
G = 10
P
O
= 50mW
P
O
= 32mW
OPEN-LOOP GAIN
Total Supply Voltage, V
S
(V)
+6
+4
+2
0
2
4
6
Normalized, A (dB)
20
30
40
50
60
70
80
T
C
= +25C
T
C
= 25C
T
C
= +85C
OPA511
6
HEAT SINKING
Power amplifiers are rated by case temperature (not ambient
temperature). The maximum allowable power dissipation is
a function of the case temperature as shown in the power
derating curve. Load characteristics, signal conditions, and
power supply voltage determine the power dissipated by the
amplifier. The case temperature will be determined by the
heat sinking conditions. Sufficient heat sinking must be
provided to keep the case temperature within safe bounds
given the power dissipated and ambient temperature. See
Application Note AN-83 for further details.
SAFE OPERATING AREA (SOA)
The safe area plot provides a comprehensive summary of the
power handling limitations of a power amplifier, including
maximum current, voltage and power as well as the second-
ary breakdown region (see Figure 1). It shows the allowable
output current as a function of the power supply to output
voltage differential (voltage across the conducting power
device). See Application Note AN-123 for details on SOA.
FIGURE 1. Safe Operating Area.
5 6 7 8 910
15
20
30
40 50 60 70
6
5
4
3
2
1
0.8
0.6
0.5
0.4
0.3
0.2
Output Current (A)
Voltage Across Output Transistor (V)
Current Limited
T
C
= +85C
T
C
= +25C
Thermal Limit
t = 5ms
t = 1ms
Secondary Breakdown
APPLICATIONS INFORMATION
POWER SUPPLIES
Specifications for the OPA511 are based on a nominal
operating voltage
28V. A single power supply or unbal-
anced supplies may be used so long as the maximum total
operating voltage (total of +V
S
and V
S
) is not greater than
68V.
CURRENT LIMITS
Current limit resistors must be provided for proper opera-
tion. Independent positive and negative current limit values
may be selected by choice of R
CL+
and R
CL
, respectively.
Resistor values are calculated by:
R
CL
= 0.65/I
LIM
(amps) 0.01
This is the nominal current limit value at room temperature.
The maximum output current decreases at high temperature
as shown in the typical performance curve. Most wire-
wound resistors are satisfactory, but some highly inductive
types may cause loop stability problems. Be sure to evaluate
performance with the actual resistors to be used in produc-
tion.
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