High Current, High Power
OPERATIONAL AMPLIFIER
FEATURES
q
HIGH OUTPUT CURRENT:
10A Peak
q
WIDE POWER SUPPLY RANGE:
10 to
40V
q
LOW QUIESCENT CURRENT: 2.6mA
q
ISOLATED CASE TO-3 PACKAGE
APPLICATIONS
q
MOTOR DRIVER
q
SERVO AMPLIFIER
q
VALVE ACTUATOR
q
SYNCRO DRIVER
q
PROGRAMMABLE POWER SUPPLY
DESCRIPTION
The OPA501 is a high output current operational
amplifier. It can be used in virtually all common op
amp circuits, yet is capable of output currents up to
10A. Power supply voltages up to
40V allow very
high output power for driving motors or other electro-
mechanical loads.
Safe operating area is fully specified, and user-set
current limits provide protection for both the amplifier
and load. The class-B (zero output stage bias) provides
low quiescent current during small-signal conditions.
This rugged hybrid integrated circuit is packaged in a
metal 8-pin TO-3 package. Both industrial and mili-
tary temperature range models are available.
OPA501
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 Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
V+
4
5
Output
3
R
CL
R
CL
+
2
+Output
Drive
8
Output
Drive
1
Current
Sense
V
6
1983 Burr-Brown Corporation
PDS-490F
Printed in U.S.A. August, 1993
2
OPA501
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.
OPA501RM, AM
OPA501SM, BM
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
RATED OUTPUT
(1, 2)
Output Current
R
L
= 2
(RM, AM)
10
*
A
Continuous
(3)
R
L
= 2.6
(SM, BM)
10
*
A
Output Voltage
(3)
I
O
= 10A peak
20
23
26
29
V
DYNAMIC RESPONSE
Bandwidth, Unity Gain
Small Signal
1
*
MHz
Full Power Bandwidth
V
O
= 40Vp-p, R
L
= 8
10
16
*
*
kHz
Slew Rate
R
L
= 5
(RM, AM)
1.35
*
V/
s
R
L
= 6.5
(SM, BM)
1.35
*
v/
s
INPUT OFFSET VOLTAGE
Initial Offset
5
10
2
5
mV
vs Temperature
25
C < T < +85
C (AM, BM)
10
65
V/
C
55
C < T < +125
C (RM, SM)
10
40
V/
C
vs Supply Voltage
35
*
V/V
INPUT BIAS CURRENT
Initial
T
CASE
= +25
C
15
40
*
20
nA
vs Temperature
0.05
*
nA/
C
vs Supply Voltage
0.02
*
nA/V
INPUT DIFFERENCE CURRENT
Initial
T
CASE
= +25
C
5
10
2
3
nA
vs Temperature
25
C < T < +85
C (AM, BM)
0.01
nA/
C
55
C < T < +125
C (RM, SM)
0.01
nA/
C
OPEN-LOOP GAIN, DC
R
L
= 5
(RM, AM)
94
115
dB
R
L
= 6.5
(SM, BM)
98
115
dB
INPUT IMPEDANCE
Differential
10
*
M
Common-mode
250
*
M
INPUT NOISE
Voltage Noise
f
n
= 0.3Hz to 10Hz
3
*
Vp-p
f
n
= 10Hz to 10kHz
5
*
Vrms
Current Noise
f
n
= 0.3Hz to 10Hz
20
*
pAp-p
f
n
= 10Hz to 10kHz
4.5
*
pArms
INPUT VOLTAGE RANGE
Common-mode Voltage
(4)
Linear Operation
(|V
S
|6)
(|V
S
|3)
*
*
V
Common-mode Rejection
f = DC, V
CM
=
(|V
S
|6)
70
110
80
*
dB
POWER SUPPLY
Rated Voltage
28
34
V
Operating Voltage Range
10
36
*
40
V
Current, quiescent
2.6
10
*
*
mA
TEMPERATURE RANGE
case
Specification, RM, SM
55
+125
*
*
C
AM, BM
25
+85
*
*
C
Operating, derated
performance, AM, BM
55
+125
*
*
C
Storage
65
+150
*
*
C
THERMAL RESISTANCE
Steady State
JC
2.0
2.2
*
*
C/W
*Specification same as for OPA501RM, AM.
NOTES: (1) Package must be derated based on a junction-to-case thermal resistance of 2.2
C/W or a junction-to-ambient thermal resistance of 30
C/W. (2) Safe
Operating Area and Power Derating Curves must be observed. (3) With
R
SC
= 0. Peak output current is typically greater than 10A if duty cycle and pulse width limitations
are observed. Output current greater than 10A is not guaranteed. (4) The absolute maximum voltage is 3V less than supply voltage.
SPECIFICATIONS
ELECTRICAL
At T
C
= +25
C, V
S
=
28V, (OPA501RM, AM); V
S
=
34V (OPA501SM, BM) unless otherwise noted.
3
OPA501
ABSOLUTE MAXIMUM RATINGS
Power Supply Voltage (V
S
) ................................................................
40V
Power Dissipation at +25
C
(1, 2)
.......................................................... 79W
Differential Input Voltage ...............................................................
V
S
3V
Common-Mode Input Voltage ..............................................................
V
S
Operating Temperature Range ....................................... 55
C to +125
C
Storage Temperature Range .......................................... 65
C to +150
C
Lead Temperature (soldering, 10s) ................................................ +300
C
Junction Temperature .................................................................... +200
C
Output Short-Circuit Duration
(3)
................................................ Continuous
NOTES: (1) At case temperature of +25
C. Derate at 2.2
C/W above case
temperature of +25
C. (2) Average dissipation. (3) Within safe operating
area and with appropriate derating.
CONNECTION DIAGRAM
Top View
1
2
3
7
8
5
6
+Output
Drive
NC
Output
Drive
Current
Sense
V
In
+In
V+
4
R
SC
+
R
SC
V
O
TEMPERATURE
MODEL
PACKAGE
RANGE
OPA501AM
8-Pin Metal TO-3
25
C to +85
C
OPA501BM
8-Pin Metal TO-3
25
C to +85
C
OPA501RM
8-Pin Metal TO-3
55
C to +125
C
OPA501SM
8-Pin Metal TO-3
55
C to +125
C
ORDERING INFORMATION
PACKAGE INFORMATION
PACKAGE DRAWING
MODEL
PACKAGE
NUMBER
(1)
OPA501AM
8-Pin Metal TO-3
030
OPA501BM
8-Pin Metal TO-3
030
OPA501RM
8-Pin Metal TO-3
030
OPA501SM
8-Pin Metal TO-3
030
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix D of Burr-Brown IC Data Book.
4
OPA501
TYPICAL PERFORMANCE CURVES
Typical at +25
C case and
V
S
= 28VDC, unless otherwise noted.
OPEN-LOOP FREQUENCY RESPONSE
120
1
Frequency (Hz)
Amplitude (dB)
10
100
1k
10k
100k
1M
10M
100
80
60
40
20
0
20
0
30
60
90
120
150
180
210
Phase (degree)
Amplitude
Phase
COMMON MODE REJECTION vs FREQUENCY
Frequency (Hz)
Common-Mode Rejection (dB)
120
100
80
60
40
20
0
1
10
100
1k
10k
100k
1M
INPUT BIAS CURRENT vs TEMPERATURE
Case Temperature (C)
Input Bias Current (Normalized)
2.8
50
25
0
25
50
75
100
125
2.4
2.0
1.6
1.2
0.8
0.4
0
OUTPUT VOLTAGE SWING
vs POWER SUPPLY VOLTAGE
Power Supply Voltage, V
S
(V)
Output Voltage (Vpk)
40
10
35
30
25
20
15
10
15
20
25
30
35
40
A
V
= 10
I
O
= 1A
I
O
= 5A
I
O
= 10A
FULL POWER RESPONSE
Frequency (kHz)
Output Voltage Swing (Vp-p)
100
1
2
4
6
10
20
40
60
60
40
20
10
6
4
2
100
+V
S
= 34V
+V
S
= 28V
Maximum
Output
Maximum "Undistorted"
Sine Wave Output
R
L
=
8
A
V
=
+10
T
C
=
+25C
HARMONIC DISTORTION vs FREQUENCY
Frequency (kHz)
Total Harmonic Distortion (%)
1.8
10
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
10
2
10
3
10
4
V
O
= 40Vp-p
A
V
= +10
V
S
= 28V
R
L
= 4
R
L
= 8
R
L
= 16
R
L
= 50
5
OPA501
TYPICAL PERFORMANCE CURVES
(CONT)
Typical at +25
C case and
V
S
= 28VDC, unless otherwise noted.
PULSE RESPONSE, A
V
= +1
Time (10
s/div)
Input/Output Voltage (5V/div)
PULSE RESPONSE, A
V
= +1
Time (100
s/div)
Input/Output Voltage (5V/div)
POWER DERATING CURVE
Case Temperature (C)
Internal Power Dissipation, P
D
(W)
120
0
100
80
60
40
20
0
25
50
75
100
125
150
JC
= 2.2C/W
CURRENT LIMIT RESISTOR vs LIMIT CURRENT
Limit Current (A)
Current Limit Resistor, R
SC
(
)
0.28
0
2
4
6
8
10
12
14
0.24
0.20
0.16
0.12
0.08
0.04
0
T
C
= +25C
CURRENT LIMIT vs TEMPERATURE
Case Temperature (C)
Short Circuit Current (A)
7
50
25
0
25
50
75
100
125
6
5
4
3
2
1
0
R
SC
= 0.12
R
SC
= 0.28
NORMALIZED THERMAL RESISTANCE
vs FREQUENCY
Frequency (Hz)
Normalized (
JC
)
1.2
1.0
0.8
0.6
0.4
0.2
0
0.1
1
10
100
1k
10k
6
OPA501
CURRENT LIMITS
The OPA501 has independent positive and negative current
limit circuits. Current limits are set by the value of R
+
SC
and
R
SC
. The approximate value of these resistors is:
I
LIMIT
is the desired maximum current at room temperature in
Amperes and R
SC
is in ohms. The current limit value de-
creases with increasing temperature--see typical perfor-
mance curves. The current limit resistors conduct the full
amplifier output current. Power dissipation of the current
limit resistors at maximum current is:
The current limit resistors can be chosen from a variety of
types. Most wire-wound types are satisfactory, although
some physically large resistors may have excessive induc-
tance which can cause instability.
SAFE OPERATING AREA
Stress on the output transistor is determined by the output
current and the voltage across the conducting output transis-
tor. 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),
APPLICATIONS INFORMATION
Grounding techniques can greatly affect the performance of
a power op amp. Figure 1 shows grounds connected so that
load current does not flow through signal ground connec-
tions. Power supply and load connections should be physi-
cally separated from the amplifier input and signal connec-
tions.
Power supply connections to the amplifier should be by-
passed with 10
F tantalum capacitors connected close to the
device pins. The capacitors should be connected to load
ground as shown.
Figure 2, shows the permissible range of voltage and cur-
rent. SOA is reduced at high operating temperature--see
Figure 3.
The safe output current decreases as V
CE
increases. Output
short-circuits are very demanding. A short-circuit to ground
forces the full power supply voltage (positive or negative
side) across the conducting transistor. With V
S
=
30V, the
current limit must be set for 2A to be safe for short-circuit
to ground. For further information on SOA and evaluating
signal and load conditions, consult Applications Bulletin
AB-039.
HEAT SINKING
Most applications require a heat sink to assure that the
maximum junction temperature of 200
C is not exceeded.
The size of the heat sink required depends on the power
dissipated by the amplifier and ambient temperature condi-
tions. Application Bulletin AB-039 explains how to find
maximum power dissipation for DC, AC, reactive loads, and
other conditions. Applications Bulletin AB-038 shows how
to determine heat sink requirements.
The case of the OPA501 is isolated from all circuitry and can
be fastened directly to a heat sink. This eliminates cumber-
some insulating hardware that degrades thermal perfor-
mance. See Applications Bulletin AB-037 for information
on mounting techniques and procedures.
FIGURE 3. Transistor Safe Operating Area at +125
C Case
Temperature.
FIGURE 1. Basic Circuit Connections.
FIGURE 2. Transistor Safe Operating Area at +25
C Case
Temperature.
P
MAX
=
(I
LIMIT
)
2
R
SC
1
2
4
6
10
20
40
60 80
10
4
2
1.0
0.8
0.6
0.4
0.2
0.1
Output Current (A)
Voltage Across Output Transistor (V)
8
6
100
Maximum
Specified
Current
8
T
CASE
= +25C
T
JUNCTION
= +200C
JC
= 2.2C/W
1ms
0.5ms
Maximum
Specified
Voltage
RM, AM
SM, BM
5ms
DC
Power
Dissipation
Limit
Second
Breakdown
Limit
1
2
4
6
10
20
40
60 80
10
4
2
1.0
0.8
0.6
0.4
0.2
0.1
Output Current (A)
Voltage Across Output Transistor (V)
8
6
100
Maximum
Specified
Current
8
T
CASE
= +125C
T
JUNCTION
= +200C
JC
= 2.2C/W
0.5ms
1ms
Maximum
Specified
Voltage
RM, AM
SM, BM
5ms
DC
+
(1)
+
(1)
OPA501
R
SC
R
SC
+
R
2
R
1
V
IN
V
V+
G = 1 +
R
2
R
1
NOTE: (1) 10F Tantalum.
Load
R
SC
=
0. 65
I
LIMIT
-
0. 0437
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