MIL-PRF-38534 AND 38535 CERTIFIED FACILITY
M.S KENNEDY CORP.
541
HIGHPOWER
POWER
HIGH
OP-AMP
OP-AMP
SERIES
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
MSK146
MSK145
MSK147
DESCRIPTION:
MSK541
The MSK541 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 MSK541 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 MSK541 is pin compatible with popular op-amps such as the BurrBrown OPA501, OPA511, OPA512, OPA541 and 3573. The MSK541 is available in a hermetically sealed 8 pin TO-3
package. The MSK145 is available in a 6 pin SIP Package. The MSK146 is an 8 pin Power DIP Package and the MSK147
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.
EQUIVALENT SCHEMATIC
(TO-3 PIN-OUT SHOWN)
TYPICAL APPLICATIONS
Servo Amplifer
Motor Driver
Audio Amplifier
Programmable Power Supply
Magnetic Deflection
PIN-OUT INFORMATION
1
2
3
4
Current Sense
No Connection
Positive Power Supply
Non-Inverting Input
5 Inverting Input
6 Negative Power Supply
7 No Connection
8 Output Drive
CASE=ISOLATED
The above pin out table is for the MSK541 (TO-3). Refer to the mechanical specifications page for the pin out information of additional
package styles.
1
8548-29 Rev. L 6/14
ABSOLUTE MAXIMUM RATINGS
±VCC
IOUT
VIN
VIN
Supply Voltage
Peak Output Current
Differential Input Voltage
Common Mode Input Voltage
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±40V
See S.O.A.
±VCC
±VCC
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10
TST
TLD
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11
Storage Temperature Range
Lead Temperature Range
(10 Seconds)
Junction Temperature
Case Operating Temperature Range
Military Versions
Industrial Versions
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TJ
TC
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Parameter
Input Bias Current
4
Input Offset Current 4
Thermal Resistance
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Military
Group A
Typ. Max.
Subgroup Min.
VIN = 0V
VIN = 0V
VIN = 0V
VCM = 0V
Either Input
VCM=0V
Input Capacitance
Input Impedance
F = DC
Common Mode Rejection Ratio 4 F = DC VCM = ±22V
Power Supply Rejection Ratio
VCC = ±10V to ±40V
Input Noise Voltage
F = 10 Hz to 1 KHz
OUTPUT
RL = 5.6Ω F = 10 KHz
Output Voltage Swing
RL =10Ω
F = 10 KHz
R
L = 5.6Ω F =10 KHz
Output Current
RL = 10Ω F = 10 KHz
Settling Time 3
0.1% 2V step
Power Bandwidth 4
RL = 10Ω VO = 20 VRMS
TRANSFER CHARACTERISTICS
Slew Rate
VOUT = ±10V RL = 10Ω
Open Loop Voltage Gain 4
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-65° to +150°C
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300°
150°C
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-55°C to +125°C
-40°C to +85°C
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9
Test Conditions
STATIC
Supply Voltage Range 2 4
Quiescent Current
INPUT
Input Offset Voltage
Input Offset Voltage Drift
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ELECTRICAL SPECIFICATIONS
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F = 10 HZ RL = 10 KΩ
(541)
All Others
±35
±20
±40
±30
Min.
±35
±20
±40
-
Units
1, 2, 3
±10
-
1
2, 3
1
2, 3
1
2, 3
-
95
-
4
5, 6
4
5, 6
4
±28
±30
±5
±3.0
45
±29
±31
±8
2
55
-
±28
±5
40
±29
±8
2
50
-
V
V
A
A
μS
KHz
4
4
5, 6
-
6
96
86
-
10
100
1.2
1.0
1.9
1.2
6
90
-
10
100
1.9
1.0
2.2
1.5
V/μS
dB
dB
°C/W
°C/W
±0.1 ±1.5
±15 ±50
±4
±50
±0.2 ±150
2.0
30
50
5
1012
113
90
10
±10
-
Industrial 5
Typ. Max.
90
-
±1.0 ±10
±15
±4 ±100
±0.2
2.0
30
5
1012
113
90
10
V
mA
mV
μV/°C
pA
nA
pA
nA
pF
Ω
dB
dB
μVRMS
NOTES:
Unless otherwise specified RCL = 0Ω, ±VCC = ±34 VDC
Electrical specifications are derated for power supply voltages other than ±34 VDC.
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 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
TA = TC = +25°C
Subgroup 2, 5
TA = TC = +125°C
Subgroup 3, 6
TA = TC =
-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.
11 Internal solder reflow temperature is 180°C, do not exceed.
1
2
3
4
5
6
7
8
2
8548-29 Rev. L 6/14
APPLICATION NOTES
HEAT SINKING
CURRENT LIMIT
To select the correct heat sink for your application, refer to the
thermal model and governing equation below.
The MSK541 has an on-board current limit scheme designed
to limit the output drivers anytime output current exceeds 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.
Thermal Model:
RCL (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 equation
only holds true for operation at +25°C case temperature. The
effect that temperature has on current limit may be seen on the
Current Limit vs. Case Temperature Curve in the Typical Performance Curves.
Current Limit Connection
Governing Equation:
TJ = PD X (RθJC + RθCS + RθSA) + TA
Where
TJ
PD
RθJC
RθCS
RθSA
TC
TA
TS
=
=
=
=
=
=
=
=
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
PD = [(quiescent current) X (+VCC - (VCC))] + [(VS - VO) X IOUT]
= (30 mA) X (70V) + (15V) X (4A)
= 2.1W + 60W
= 62.1W
2.) For conservative design, set TJ = +150°C
3.) For this example, worst case TA = +25°C
4.) RθJC = 1.2°C/W typically for the TO-3 package
5.) RθCS = 0.15°C/W for most thermal greases
6.) Rearrange governing equation to solve for RθSA
RθSA = (TJ - TA) / PD - (RθJC) - (RθCS)
= (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 effective
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 practice
with very high power op-amps, such as the MSK541, 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 MSK541).
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, transistor 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.
8548-29 Rev. L 6/14
APPLICATION CIRCUITS
Clamping Output for EMF-Generating Loads
Isolating Capacitive Loads
Replacing OPA501 with MSK541
Motor Current a Function of VIN
Programmable Torque Circuit
When replacing the OPA501, OPA511, OPA512 or 3573
with the MSK541, it is not necessary to make any changes
in the current limit scheme. Since pin 2 is not connected in
the MSK541, the current limit resistor connected from pin
1 to pin 2 can be left in the circuit or removed.
The linear relationship of torque output to current input
of the modern torque motor makes this simple control circuit ideal for many material processing and testing applications. The sense resistor develops a feedback voltage
proportional to motor current and the small signal properties of the Power Op Amp insure accuracy. With this closed
loop operation, temperature induced impedance variations
of the motor winding are automatically compensated.
4
8548-29 Rev. L 6/14
TYPICAL PERFORMANCE CURVES
5
8548-29 Rev. L 6/14
MECHANICAL SPECIFICATIONS
MSK145
POWER SIP PACKAGE
CASE=ISOLATED
WEIGHT=14.2 GRAMS TYPICAL
ALL DIMENSIONS ARE SPECIFIED IN INCHES
MSK146
WEIGHT=5.9 GRAMS TYPICAL
POWER DIP PACKAGE
CASE=ISOLATED
ESD TRIANGLE INDICATES PIN 1
MSK147
WEIGHT=6.5 GRAMS TYPICAL
6
POWER Z-TAB PACKAGE
CASE=ISOLATED
8548-29 Rev. L 6/14
MECHANICAL SPECIFICATIONS CONTINUED
ALL DIMENSIONS ARE SPECIFIED IN INCHES
WEIGHT=15.2 GRAMS TYPICAL
ORDERING INFORMATION
Part
Number
MSK541
MSK541B
5962-887010101X
5962-887010103X
Screening Level
Industrial
MIL-PRF-38534, Class H
DSCC-SMD
DSCC-SMD
7
8548-29 Rev. L 6/14
REVISION HISTORY
M.S. Kennedy Corp.
Phone (315) 701-6751
Fax (315) 701-6752
www.mskennedy.com
The information contained herein is believed to be accurate at the time of printing. MSK reserves the right to make
changes to its products or specifications without notice, however and assumes no liability for the use of its products.
Please visit our website for the most recent revision of this datasheet
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8548-29 Rev. L 6/14