Datasheet OPA501AM Datasheet (Burr Brown)

®

High Current, High Power

OPERATIONAL AMPLIFIER

OPA501

FEATURES

● HIGH OUTPUT CURRENT: ±10A Peak

● WIDE POWER SUPPLY RANGE:

±10 to ±40V

● LOW QUIESCENT CURRENT: 2.6mA

● ISOLATED CASE TO-3 PACKAGE

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 electro­mechanical 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 mili­tary temperature range models are available.

APPLICATIONS

● MOTOR DRIVER

● SERVO AMPLIFIER

● VALVE ACTUATOR

● SYNCRO DRIVER

● PROGRAMMABLE POWER SUPPLY

V+

3

+Output

2

Drive

5

4

1

Current

Sense

8

–Output

Drive

+

R

CL

Output

–

R

CL

6

V–

International Airport Industrial Park • Mailing Address: PO Box 11400 • Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706

Tel: [phone] • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

©

1983 Burr-Brown Corporation PDS-490F Printed in U.S.A. August, 1993

SPECIFICATIONS

ELECTRICAL

At TC = +25°C, VS = ±28V, (OPA501RM, AM); VS = ±34V (OPA501SM, BM) unless otherwise noted.

OPA501RM, AM OPA501SM, BM
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
RATED OUTPUT

Output Current RL = 2Ω (RM, AM) ±10 * A
Continuous
Output Voltage

DYNAMIC RESPONSE

Bandwidth, Unity Gain Small Signal 1 * MHz
Full Power Bandwidth V
Slew Rate R

INPUT OFFSET VOLTAGE

Initial Offset ±5 ±10 ±2 ±5mV

vs Temperature –25°C < T < +85°C (AM, BM) ±10 ±65 µV/°C

vs Supply Voltage ±35 * µV/V

INPUT BIAS CURRENT

Initial T

vs Temperature ±0.05 * nA/°C
vs Supply Voltage ±0.02 * nA/V

INPUT DIFFERENCE CURRENT

Initial T

vs Temperature –25°C < T < +85°C (AM, BM) ±0.01 nA/°C

OPEN-LOOP GAIN, DC R

R

= 6.5Ω (SM, BM) 98 115 dB

L

INPUT IMPEDANCE

Differential 10 * MΩ
Common-mode 250 * MΩ

INPUT NOISE

Voltage Noise f

f

= 10Hz to 10kHz 5 * µVrms

n

Current Noise f

f

= 10Hz to 10kHz 4.5 * pArms

n

INPUT VOLTAGE RANGE

Common-mode Voltage
Common-mode Rejection f = DC, V

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

*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
are observed. Output current greater than 10A is not guaranteed. (4) The absolute maximum voltage is 3V less than supply voltage.

(1, 2)

(3)

(3)

RL = 2.6Ω (SM, BM) ±10 * A

IO = 10A peak ±20 ±23 ±26 ±29 V

= 40Vp-p, RL = 8Ω 10 16 * * kHz

O

= 5Ω (RM, AM) 1.35 * V/µs

L

R

= 6.5Ω (SM, BM) 1.35 * v/µs

L

–55°C < T < +125°C (RM, SM) ±10 ±40 µV/°C

= +25°C1540*20nA

CASE

= +25°C ±5 ±10 ±2 ±3nA

CASE

–55°C < T < +125°C (RM, SM) ±0.01 nA/°C

= 5Ω (RM, AM) 94 115 dB

L

= 0.3Hz to 10Hz 3 * µVp-p

n

= 0.3Hz to 10Hz 20 * pAp-p

n

(4)

Linear Operation ±(|VS|–6) ±(|VS|–3) * * V

= ±(|VS|–6) 70 110 80 * dB

CM

θ

JC

= 0. Peak output current is typically greater than 10A if duty cycle and pulse width limitations

SC

2.0 2.2 * * °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.

®

OPA501

2

®

ABSOLUTE MAXIMUM RATINGS

Power Supply Voltage (VS) ................................................................ ±40V

Power Dissipation at +25°C

Differential Input Voltage............................................................... ±V

Common-Mode Input Voltage .............................................................. ±V

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
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.

(1, 2)

.......................................................... 79W

(3)

................................................ Continuous

–3V

S

ORDERING INFORMATION

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

TEMPERATURE

PACKAGE INFORMATION

MODEL PACKAGE NUMBER

PACKAGE DRAWING

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.

(1)

CONNECTION DIAGRAM

Top View

S

V+

3

+In

4

5

–In

+Output

Drive

2

1

Current

Sense

8

6

V–

NC

–Output

7

Drive

+

R

SC

V

O

–

R

SC

3

OPA501

TYPICAL PERFORMANCE CURVES

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

AV = 10

IO = 1A

IO = 5A

IO = 10A

Typical at +25°C case and ±V

= 28VDC, unless otherwise noted.

S

120

100

80

60

40

Amplitude (dB)

20

0

–20

1

2.8

2.4

2.0

1.6

1.2

OPEN-LOOP FREQUENCY RESPONSE

Phase

Amplitude

10 100 1k 10k 100k 1M 10M

Frequency (Hz)

INPUT BIAS CURRENT vs TEMPERATURE

0

–30

–60

–90

–120

–150

–180

–210

120

100

80

60

Phase (degree)

40

20

Common-Mode Rejection (dB)

0

1

COMMON MODE REJECTION vs FREQUENCY

10 100 1k 10k 100k 1M

Frequency (Hz)

Input Bias Current (Normalized)

Output Voltage Swing (Vp-p)

0.8

0.4

0

–50 –25 0 25 50 75 100 125

Case Temperature (°C)

FULL POWER RESPONSE

100

60
40

+VS = ±34V

+VS = ±28V

Maximum

Output

20

Maximum “Undistorted”

10

Sine Wave Output

6
4

2

RL = 8
A

V =

T

C =

Ω

+10
+25°C

1 2 4 6 10 20 40 60

Frequency (kHz)

®

OPA501

100

HARMONIC DISTORTION vs FREQUENCY

1.8

10

2

VO = 40Vp-p

= +10

A

V

= ±28V

V

S

RL = 16
RL = 50

RL = 4
RL = 8

10

Ω
Ω

Ω
Ω

3

4

10

1.6

1.4

1.2

1.0

0.8

0.6

0.4

Total Harmonic Distortion (%)

0.2
0

10

Frequency (kHz)

4

®

TYPICAL PERFORMANCE CURVES (CONT)

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

θ

Typical at +25°C case and ±V

= 28VDC, unless otherwise noted.

S

120

(W)

100

D

80

60

40

20

Internal Power Dissipation, P

0

0

±7

±6

±5

±4

±3

±2

Short Circuit Current (A)

±1

POWER DERATING CURVE

25 50 75 100 125 150

CURRENT LIMIT vs TEMPERATURE

= 2.2°C/W

θ

JC

Case Temperature (°C)

RSC = 0.12Ω

RSC = 0.28Ω

0.28

0.24

(Ω)

SC

0.20

0.16

0.12

0.08

Current Limit Resistor, R

0.04

CURRENT LIMIT RESISTOR vs LIMIT CURRENT

TC = +25°C

0

02468101214

Limit Current (A)

0

–50 –25 0 25 50 75 100 125

Case Temperature (°C)

PULSE RESPONSE, AV = +1



Input/Output Voltage (5V/div)

Time (10µs/div)

PULSE RESPONSE, AV = +1



Input/Output Voltage (5V/div)

Time (100µs/div)

5

OPA501

APPLICATIONS INFORMATION

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

= +25°C

T

JUNCTION

= +200°C

JC

= 2.2°C/W

θ

1ms

0.5ms

Maximum
Specified
Voltage

RM, AM

SM, BM

5ms

DC

Power

Dissipation

Limit

Second

Breakdown

Limit

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 connec­tions. Power supply and load connections should be physi­cally separated from the amplifier input and signal connec­tions.

Power supply connections to the amplifier should be by­passed with 10µF tantalum capacitors connected close to the
device pins. The capacitors should be connected to load
ground as shown.

R

2

(1)

+

OPA501

(1)

V

R

IN

1

+

V– V+

+

R

SC

–

R

SC

G = 1 +

NOTE: (1) 10µF Tantalum.

Load

R

2

R

1

Figure 2, shows the permissible range of voltage and cur­rent. SOA is reduced at high operating temperature—see
Figure 3.

The safe output current decreases as V

increases. Output

CE

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
current limit must be set for 2A to be safe for short-circuit

= ±30V, the

S

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 condi­tions. 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 cumber­some insulating hardware that degrades thermal perfor­mance. See Applications Bulletin AB-037 for information
on mounting techniques and procedures.

FIGURE 1. Basic Circuit Connections.

CURRENT LIMITS

The OPA501 has independent positive and negative current
limit circuits. Current limits are set by the value of R

–

. The approximate value of these resistors is:

R

SC

0.65

RSC=

I

LIMIT

is the desired maximum current at room temperature in

I

LIMIT

Amperes and R

is in ohms. The current limit value de-

SC

creases with increasing temperature—see typical perfor­mance curves. The current limit resistors conduct the full
amplifier output current. Power dissipation of the current
limit resistors at maximum current is:

P

= (I

MAX

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 induc­tance 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 transis­tor. The power dissipated by the output transistor is equal to
the product of the output current and the voltage across the
conducting transistor, V

®

OPA501

. The Safe Operating Area (SOA),

CE

− 0.0437Ω

)2R

LIMIT

SC

+

and

SC

FIGURE 2. Transistor Safe Operating Area at +25°C Case

Temperature.

10

8
6

4

Maximum

Specified

2

Current

1.0

T

= +125°C

CASE

0.8

0.6

Output Current (A)

0.4

0.2

0.1
1 2 4 6 10 20 40 60 80

T

JUNCTION

θ

= 2.2°C/W

JC

= +200°C

Voltage Across Output Transistor (V)

DC

Maximum
Specified
Voltage

5ms

RM, AM

SM, BM

8

0.5ms

1ms

100

FIGURE 3. Transistor Safe Operating Area at +125°C Case

Temperature.

6