MIL-PRF-38534 CERTIFIED
M.S KENNEDY CORP.
4707 Dey Road
Liverpool, N.Y. 13088
HIGH POWER
HIGH POWER
OP-AMP
OP-AMP
541
SERIES
(315) 701-6751
MSK146
FEATURES:
Available to SMD #5962-88701
High Output Current - 10 Amps Peak
Wide Power Supply Range - ±10V to ±40V
Programmable Current Limit
FET Input
Isolated Case
Replacement for OMA 541SKB - MSK541
OMA 541SDB - MSK146
OMA 541SZB - MSK147
MSK145
MSK541
The MSK 541 is a high power monolithic amplifier ideally suited for high power amplification and magnetic
deflection applications. This amplifier is capable of operation at a supply voltage rating of 80 volts and can deliver
guaranteed continuous output currents up to 5A, making the 541 series an excellent low cost choice for motor drive
circuits. The amplifier and load can be protected from fault conditions through the use of internal current limit
circuitry that can be user programmed with a single external resistor. The MSK 541 is pin compatible with popular
op-amps such as the Burr-Brown OPA501, OPA511, OPA512, OPA541 and 3573. The MSK 541 is available in a
hermetically sealed 8 pin TO-3 package. The MSK 145 is available in a 6 pin SIP Package. The MSK 146 is an 8
pin Power DIP Package and the MSK 147 is available in an 8 pin Power Z-TAB Package for applications requiring bolt
down heat sinking. Other package styles are also available for a wide range of applications.
DESCRIPTION:
MSK147
EQUIVALENT SCHEMATIC
(TO-3 PIN-OUT SHOWN)
TYPICAL APPLICATIONS
Servo Amplifer
Motor Driver
Audio Amplifier
Programmable Power Supply
Magnetic Deflection
PIN-OUT INFORMATION
1 Current Sense
5 Inverting Input
2 No Connection
6 Negative Power Supply
3 Positive Power Supply
7 No Connection
4 Non-Inverting Input
8 Output Drive
The above pin out table is for the MSK 541 (TO-3). Refer to the
mechanical specifications page for the pin out information of addi-
tional package styles.
1
Rev. F 9/06
ABSOLUTE MAXIMUM RATINGS
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10
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-55°C to +125°C
-40°C to +85°C
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ELECTRICAL SPECIFICATIONS
Parameter
STATIC
Supply Voltage Range
2 4
Quiescent Current
INPUT
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
4
9
Test Conditions
Military/E
Group A
Typ. Max.
Subgroup Min.
-
1, 2, 3
1
2, 3
1
2, 3
1
2, 3
-
-
-
-
-
4
5, 6
4
5, 6
-
4
4
4
5, 6
-
-
±10
-
-
-
-
-
-
-
-
-
95
-
-
±28
±30
±5
±3.0
-
45
6
95
86
-
-
±35
±20
±0.1
±15
±4
±0.2
2.0
-
5
10
12
113
90
10
±29
±31
±8
-
2
55
10
100
-
1.2
1.0
±40
±30
±1.5
±50
±50
±50
30
20
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1.9
1.2
Industrial
5
Min. Typ. Max.
±10
-
-
-
-
-
-
-
-
-
90
-
-
±28
-
±5
-
-
40
6
90
-
-
-
±35
±20
±40
±35
V
IN
= 0V
V
IN
= 0V
V
IN
= 0V
V
CM
= 0V
Either Input
V
CM
=0V
Input Offset Current
4
Input Capacitance
Input Impedance
F = DC
Common Mode Rejection Ratio
4
F = DC V
CM
= ±22V
Power Supply Rejection Ratio
V
CC
= ±10V to ±40V
Input Noise Voltage
F = 10 Hz to 1 KHz
OUTPUT
R
L
= 5.6Ω F = 10 KHz
Output Voltage Swing
R
L
=10Ω
F = 10 KHz
R
L
= 5.6Ω F =10 KHz
Output Current
R
L
= 10Ω F = 10 KHz
Settling Time
3
0.1% 2V step
4
Power Bandwidth
R
L
= 10Ω V
O
= 20 V
RMS
TRANSFER CHARACTERISTICS
Slew Rate
V
OUT
= ±10V R
L
= 10Ω
Open Loop Voltage Gain
4
Thermal Resistance
F = 10 H
Z
R
L
= 10 KΩ
(541)
All Others
±1.0 ±10
±15
-
±4 ±100
±0.2
-
2.0
30
-
-
5
-
12
10
-
-
113
-
90
-
10
±29
-
±8
-
2
50
10
100
-
1.9
1.0
-
-
-
-
-
-
-
-
-
2.2
1.5
NOTES:
Unless otherwise specified R
CL
= 0Ω,
±V
CC
=
±34
V
DC
Electrical specifications are derated for power supply voltages other than ±34 V
DC
.
AV = -1, measured in false summing junction circuit.
Devices shall be capable of meeting the parameter, but need not be tested. Typical parameters are for reference only.
Industrial and E grade devices shall be tested to subgroups 1 and 4 unless otherwise specified.
Military grade devices ('B' suffix) shall be 100% tested to subgroups 1, 2, 3 and 4.
Subgroup 5 and 6 testing available upon request.
Subgroup 1, 4
T
A
= T
C
= +25°C
Subgroup 2, 5
T
A
= T
C
= +125°C
Subgroup 3, 6
T
A
= T
C
=
-55°C
9 Reference DSCC SMD 5962-88701 for electrical specifications for devices purchased as such.
10
Continuous operation at or above maximum ratings may adversely effect the device performance and/or life cycle.
1
2
3
4
5
6
7
8
2
Rev. F 9/06
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T
J
T
C
150°C
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±V
CC
I
OUT
V
IN
V
IN
Supply Voltage
Peak Output Current
Differential Input Voltage
Common Mode Input Voltage
±40V
See S.O.A.
±V
CC
±V
CC
T
ST
T
LD
Storage Temperature Range
Lead Temperature Range
(10 Seconds)
Junction Temperature
Case Operating Temperature Range
Military and E Versions
Industrial Versions
-65° to +150°C
300°
Units
V
mA
mV
µV/°C
pA
nA
pA
nA
pF
W
dB
dB
µV
RMS
V
V
A
A
µS
KHz
V/µS
dB
dB
°C/W
°C/W
APPLICATION NOTES
HEAT SINKING
To select the correct heat sink for your application, refer to the
thermal model and governing equation below.
CURRENT LIMIT
The MSK 541 has an on-board current limit scheme de-
signed to limit the output drivers anytime output current ex-
ceeds a predetermined limit. The following formula may be
used to determine the value of the current limit resistance
necessary to establish the desired current limit.
R
CL
(OHMs) = (0.809 volts / current limit in amps) - 0.057 OHM
The 0.057 OHM term takes into account any wire bond and
lead resistance. Since the 0.809 volt term is obtained from
the base emitter voltage drop of a bipolar transistor, the equa-
tion only holds true for operation at +25°C case tempera-
ture. The effect that temperature has on current limit may be
seen on the Current Limit vs. Case Temperature Curve in the
Typical Performance Curves.
Thermal Model:
Current Limit Connection
Governing Equation:
T
J
= P
D
X (R
θJC
+ R
θCS
+ R
θSA
) + T
A
Where
T
J
P
D
R
θJC
R
θCS
R
θSA
T
C
T
A
T
S
=
=
=
=
=
=
=
=
Junction Temperature
Total Power Dissipation
Junction to Case Thermal Resistance
Case to Heat Sink Thermal Resistance
Heat Sink to Ambient Thermal Resistance
Case Temperature
Ambient Temperature
Sink Temperature
See "Application Circuits" in this data sheet for additional
information on current limit connections.
Example:
(TO-3 PACKAGE)
In our example the amplifier application requires the output to
drive a 20 volt peak sine wave across a 5 ohm load for 4 amps of
output current. For a worst case analysis we will treat the 4 amps
peak output current as a D.C. output current. The power supplies
are ±35 VDC.
1.) Find Power Dissipation
P
D
= [(quiescent current) X (+V
CC
- (V
CC
))] + [(V
S
- V
O
) X I
OUT
]
= (30 mA) X (70V) + (15V) X (4A)
= 2.1W + 60W
= 62.1W
2.) For conservative design, set T
J
= +150°C
3.) For this example, worst case T
A
= +25°C
4.) R
θJC
= 1.2°C/W typically for the TO-3 package
5.) R
θCS
= 0.15°C/W for most thermal greases
6.) Rearrange governing equation to solve for R
θSA
R
θSA
= (T
J
- T
A
) / P
D
- (R
θJC
) - (R
θCS
)
= (150°C - 25°C) / 62.1W - (1.2°C/W) - (0.15°C/W)
= 0.66°C/W
The heat sink in this example must have a thermal resistance of
no more than 0.66°C/W to maintain a junction temperature of no
more than +150°C. Since this value of thermal resistance may be
difficult to find, other measures may have to be taken to decrease
the overall power dissipation.
3
POWER SUPPLY BYPASSING
Both the negative and the positive power supplies must be
effectively decoupled with a high and low frequency bypass
circuit to avoid power supply induced oscillation. An effec-
tive decoupling scheme consists of a 0.1 microfarad ceramic
capacitor in parallel with a 4.7 microfarad tantalum capacitor
from each power supply pin to ground. It is also a good prac-
tice with very high power op-amps, such as the MSK 541, to
place a 30-50 microfarad nonelectrolytic capacitor with a low
effective series resistance in parallel with the other two power
supply decoupling capacitors. This capacitor will eliminate
any peak output voltage clipping which may occur due to poor
power supply load regulation. All power supply decoupling
capacitors should be placed as close to the package power
supply pins as possible (pins 3 and 6 for the MSK 541).
SAFE OPERATING AREA
The safe operating area curve is a graphical representation
of the power handling capability of the amplifier under various
conditions. The wire bond current carrying capability, transis-
tor junction temperature and secondary breakdown limitations
are all incorporated into the safe operating area curves. All
applications should be checked against the S.O.A. curves to
ensure high M.T.B.F.
Rev. F 9/06
APPLICATION CIRCUITS
Clamping Output for EMF-Generating Loads
Isolating Capacitive Loads
Motor Current a Function of V
IN
Programmable Torque Circuit
Replacing OPA501 with MSK 541
The linear relationship of torque output to current input
of the modern torque motor makes this simple control cir-
cuit ideal for many material processing and testing appli-
cations. The sense resistor develops a feedback voltage
proportional to motor current and the small signal proper-
ties of the Power Op Amp insure accuracy. With this
closed loop operation, temperature induced impedance
variations of the motor winding are automatically com-
pensated.
When replacing the OPA501, OPA511, OPA512 or 3573
with the MSK 541, it is not necessary to make any changes
in the current limit scheme. Since pin 2 is not connected
in the MSK 541, the current limit resistor connected from
pin 1 to pin 2 can be left in the circuit or removed.
4
Rev. F 9/06
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