ISO 9001 CERTIFIED BY DSCC
M.S. KENNEDY CORP
2541
DUAL HIGH POWER
OP-AMP
4707 Dey Road Liverpool, N.Y. 13088
(315) 701-6751
MIL-PRF-38534 CERTIFIED
FEATURES:
Available as SMD #5962-9083801 HX
High Output Current - 10 Amps Peak
Wide Power Supply Range - ±10V to ±40V
On Board Current Limit
FET Input
Isolated Case
Second Source for OMA 2541SKB
DESCRIPTION:
The MSK 2541 is a high power dual 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 per amplifier. The MSK 2541 has internal current limit circuitry to
protect the amplifier and load from transients. The MSK 2541 is available in a hermetically sealed 8 pin TO3 package
that is isolated from internal circuitry. This allows for convenient bolt down heat sinking when necessary.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
Servo Amplifer
Motor Driver
Audio Amplifier
Programmable Power Supply
Bridge Amplifier
PIN-OUT INFORMATION
1
2
3
4
Output B
Positive Power Supply
Non-Inverting Input A
Inverting Input A
1
8
7
6
5
Inverting Input B
Non-Inverting Input B
Negative Power Supply
Output A
Rev. B 8/00
ABSOLUTE MAXIMUM RATINGS
±VCC
IOUT
VIN
VIN
TC
TST
TLD
Voltage Supply
±40V
Peak Output Current
See S.O.A.
Differential Input Voltage
±VCC
Common Mode Input Voltage
±VCC
Case Operating Temperature Range
MSK 2541B
-55° to +125°C
MSK 2541
-40° to +85°C
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Storage Temperature Range
Lead Temperature Range
(10 Seconds)
Power Dissipation
Junction Temperature
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PD
TJ
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-65° to +150°C
300°C
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125W
150°C
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ELECTRICAL SPECIFICATIONS
MSK 2541
MSK 2541B
Parameter
Military
Group A
Typ. Max.
Subgroup Min.
Test Conditions
STATIC
Supply Voltage Range 2 4
Total - Both Amplifiers VIN = 0V
Quiescent Current
INPUT
Input Offset Voltage
VIN = 0V
Input Offset Voltage Drift
VIN = 0V
VCM = 0V
Input Bias Current
Either Input
Input Bias Current
Input Capacitance
Input Impedance 4
Common Mode Rejection Ratio 4
Power Supply Rejection Ratio 4
OUTPUT
VCM = 0V
F = DC
F = DC VCM = ±22V
VCC = ±10V to ±40V
RL = 5.6Ω F ≤ 10 KHz
RL = 10Ω F = 10 KHz
RL = 5.6Ω F ≤ 10 KHz
Output Current
RL = 10Ω F = 10 KHz
Settling Time 3 4
0.1% 2V step
Power Bandwidth
RL = 10Ω VO = 20 VRMS
TRANSFER CHARACTERISTICS
Slew Rate
VOUT = ±10V RL = 10Ω
Output Voltage Swing
Open Loop Voltage Gain
F = 10 Hz RL = 10 KΩ
THERMAL RESISTANCE 4
θJC (Junction to Case)
One Amplifier, DC Output
θJC
One Amplifier, AC Output F > 60 Hz
θJC
Both Amplifiers, DC Output
θJC
Both Amplifiers, AC Output F > 60 Hz
θJA (Junction to Ambient)
No Heat Sink
5
Industrial
Min. Typ. Max.
Units
±35
±40
V
mA
1, 2, 3
±10
-
±35
±40
±40
±60
±10
-
1
2, 3
1
2, 3
1
2, 3
-
95
-
±0.1
±15
±4
±10
2.0
5
1012
113
90
±1.0
±30
±50
±50
30
20
-
90
-
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
95
85
10
100
-
-
6
90
-
10
100
-
-
V/µS
dB
dB
-
-
1.4
1.25
0.9
0.8
30
1.9
1.5
1.2
1.0
-
-
1.4
1.25
0.9
0.8
30
1.9
1.5
1.2
1.0
-
°C/W
°C/W
°C/W
°C/W
°C/W
±40
±60
±1.0 ±10
±15
±4 ±100
±10
2.0
30
5
1012
113
90
mV
µV/°C
pA
nA
pA
nA
pF
W
dB
dB
NOTES:
1
2
3
4
5
6
7
8
Unless otherwise specified: RCL = 0Ω, ±VCC = ±34 VDC, all specs are per amplifier.
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 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
TA=TC=+25°C
Subgroup 2, 5
TA=TC=+125°C
Subgroup 3, 6
TA=TC=-55°C
2
Rev. B 8/00
APPLICATION NOTES
HEAT SINKING
POWER SUPPLY CONNECTIONS
To select the correct heat sink for your application, refer to the
thermal model and governing equation below.
The MSK 2541 maximum supply voltage is specified as
±40V. However, single sided or unbalanced power supply
operation is permissible as long as the total power supply voltage does not exceed 80V. Caution should be exercised when
routing high current printed circuit paths. Generally, these
paths should not be placed near low level, high impedance
input circuitry to avoid oscillations.
Thermal Model:
During prototype evaluation, power supply current limiting
is strongly advised to avoid damaging the device. See the
application note entitled "Current Limit" for an explanation of
the limitations of the MSK 2541 on board current limit.
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 MSK 2541, to
place a 30-50 microfarad non-electrolytic 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).
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
CURRENT LIMIT
Example:
In our example the amplifier application requires each output to
drive a 20 volt peak sine wave across a 10 ohm load for 2 amps of
output current. For a worst case analysis we will treat the 2 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))] + [(VCC - VO) X IOUT]
= (30 mA) X (70V) + (15V) X (2A)+(15V)x(2A)
= 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
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) - (.15°C/W)
= ≅.66°C/W
The internal current limit should not be used as a short circuit protection scheme. When the output is directly shorted
to ground, the power supply voltage is applied across the output transistor that is conducting. If the power supplies were
set to ±40V and the output was shorted to ground, the transistor that is conducting current would see 40V from its emitter to its collector. Referring to the safe operating area curve
shows when [VCC-VOUT]=40V, the maximum safe output
current (IO) at TC=25°C is 1.5A. In this case the amplifier
would not be protected by the internal current limit and would
probably be damaged. The internal current limit is provided as
a protection against unintentional load conditions which may
require larger amounts of load current than the amplifier is
rated for.
SAFE OPERATING AREA
The heat sink in this example must have a thermal resistance of
no more than .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. Refer to the "Heat Sinking Options"
application note offered by MSK.
3
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.T.F.
Rev. B 8/00
TYPICAL PERFORMANCE CURVES
4
Rev. B 8/00
APPLICATION CIRCUITS
CLAMPING OUTPUT FOR EMF-GENERATING LOADS
ISOLATING CAPACITVE LOADS
PROGRAMMABLE VOLTAGE SOURCE
PARALLELED OPERATION, EXTENDED S.O.A.
5
Rev. B 8/00
MECHANICAL SPECIFICATIONS
ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE SPECIFIED.
ORDERING INFORMATION
Part
Number
Screening Level
MSK2541
Industrial
MSK2541B
Military-MIL-PRF-38534
5962-9083801HX
DSCC - SMD
M.S. Kennedy Corp.
4707 Dey Road, Liverpool, New York 13088
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.
6
Rev. B 8/00