4707 Dey Road Liverpool, N.Y. 13088
M.S.KENNEDY CORP.
(315) 701-6751
FEATURES:
115
ISO-9001 CERTIFIED BY DSCC
POWER
High Output Current - 15A peak
Ultra Low Thermal Resistance - 0.43C/W
Excellent Linearity - Class A/B Output
Wide Supply Range - 10V to 50V
High Power Dissipation - 175W at T
C
=125C
Output Short Circuit Protected
User Programmable Current Limit
Isolated Case Allows Direct Heat Sinking
Low Quiescent Current -22mA. Typ
MIL-PRF-38534 QUALIFIED
DESCRIPTION:
The MSK 115 is a High Power Operational Amplifier. Due to the extremely low thermal resistance from the transistor
junctions to the case, the MSK 115 can dissipate extreme amounts of power at a case temperature of 125C. The
amplifier is packaged in a hermetic plug in power package with bolt down tabs.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
TYPICAL APPLICATIONS
PIN-OUT INFORMATION
Magnetic Deflection Circuit Driver
Programmable Power Supplies
Motor, Valve and Actuator Control
Audio Amplifier
+V
CC
Balance
Inverting Input
Non-Inverting Input
Balance
-V
CC
1
2
3
4
5
6
+V
C
+Current Limit
Output
Output
-Current Limit
-V
C
12
11
10
9
8
7
Rev. A 6/02
1
EQUIVALENT SCHEMATIC
OPERATIONAL AMPLIFIER
MSK 115
STATIC
Supply Voltage Range
Quiescent Current
Thermal Resistance
INPUT
Input Offset Voltage
Input Offset Adjust
Input Bias Current
Input Offset Current
Input Impedance
Common Mode Range
Common Mode Rejection Ratio
OUTPUT
Output Voltage Swing
Output Current, Peak
Settling Time
TRANSFER CHARACTERISTICS
Slew Rate
Open Loop Voltage Gain
Gain Bandwidth Product
Supply Voltage
Output Current
Differential Input Voltage
Case Operating Temperature Range
(MSK 115B/E) -55C to+125C
(MSK 115) -40C to +85C
Storage Temperature Range -65C to +150C
Lead Temperature Range
300C
(10 Seconds)
Power Dissipation See S0A Curve
Junction Temperature 175C
Group A
Subgroup
-
1
2,3
-
1
2,3
1
2,3
1
2,3
1
2,3
-
-
-
4
4
4
-
4
4
-
V
mA
mA
C/W
mV
mV
mV
mV
nA
nA
nA
nA
M
V
dB
V
V
A
S
V/S
dB
MHz
V
IN
=0V
A
V
=-10V/V
Junction to Case
V
IN
=0V A
V
=10V/V
Bal.Pins=NC
R
POT
=10K
To -V
CC
A
V
=-10V/V
V
CM
=0V
Either Input
V
CM
=0V
F=DC
F=100Hz V
CM
=5V
R
L
=500
A
V
=-10V/V
R
L
=10
R
SC
0.02
A
V
=-10V/V T
J
<175C
0.1% 10V step
V
OUT
=10V R
L
=500
A
V
=-10V/V
R
L
=500
F=10Hz
R
L
=10
F=1 MHz
50V
15A
37V
V
CC
I
OUT
V
IN
T
C
Parameter
T
ST
T
LD
P
D
T
J
ELECTRICAL SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Test Conditions
NOTES:
AV= -1, measured in false summing junction circuit.
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
Industrial grade and "E" suffix 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.
Subgroups 5 and 6 testing available upon request.
Subgroup 1,4
Subgroup 2,5
Subgroup 3,6
T
A
=T
C
=+25C
T
A
=T
C
=+125C
T
A
=T
C
=-55C
MSK 115B/E
Min.
10
-
-
-
-
-
-
-
-
-
50
-
80
35
35
15
-
2.5
95
-
Typ.
-
22
28
0.43
2
3
10
15
5
10
250
35
100
37
37
-
2
5
105
4
Max.
50
35
45
0.55
6
12
30
60
30
50
-
-
-
-
-
-
-
-
-
-
Typ.
-
22
-
0.43
2
-
-
10
-
5
-
250
35
100
37
37
-
5
2.5
105
3
MSK 115
Min.
10
-
-
-
-
-
-
-
-
-
-
35
-
74
33
33
10
-
1
85
-
Max.
50
40
-
0.6
10
-
-
50
-
50
-
-
-
-
-
-
-
-
-
-
-
Units
Rev. A 6/02
2
Vcc=40VDC Unless Otherwise Specified
1
5
3
4
2
6
Adjust to zero
Adjust to zero
2
2
Adjust to zero
2
2
2
2
2
1
2
APPLICATION NOTES
HEAT SINKING
To determine if a heat sink is necessary for your application and
if so, what type, refer to the thermal model and governing equation
below.
Governing Equation:
Example
:
In our example the amplifier application requires the output to
drive a 20 volt peak sine wave across a 20 ohm load for 1 amp of
output current. For a worst case analysis we will treat the 1 amp
peak output current as a D.C. output current. The power supplies
are 40 VDC.
1.) Find Power Dissipation
P
D
=[(quiescent current) x (V
S
-(V
S
))]+[(+V
S
-V
O
) x I
OUT
]
=(25mA) x (80V)+(20V) x (1A)
=2W+20W
=22W
2.) For conservative design, set T
J
=+125C
3.) For this example, worst case T
A
=+50C
4.) R
JC
=0.55C/W from MSK 115B Data Sheet
5.) R
CS
=0.15C/W for most thermal greases
6.) Rearrange governing equation to solve for R
SA
R
SA
=((
T
J
-
T
A
)/
P
D
) - (
R
JC
) - (
R
CS
)
=((125C -50C)/22W) - (0.55C/W) - (0.15C/W)
=2.71C/W
The heat sink in this example must have a thermal resistance of
no more than 2.71C/W to maintain a junction temperature of no
more than +125C.
Rev. A 6/02
3
T
J=
P
D x
(R
JC +
R
CS +
R
SA
)
+
T
A
Where
T
J=
Junction Temperature
P
D=
Total Power Dissipation
R
JC=
Junction to Case Thermal Resistance
R
CS=
Case to Heat Sink Thermal Resistance
R
SA=
Heat Sink to Ambient Thermal Resistance
T
C=
Case Temperature
T
A=
Ambient Temperature
T
S=
Sink Temperature
Thermal Model:
CURRENT LIMIT
The MSK 115 has an on-board current limit scheme designed to
shut off the output drivers anytime output current exceeds a prede-
termined limit. The following formula may be used to determine the
value of current limit resistance necessary to establish the desired
current limit.
R
CL
=(OHMs)=(0.65 volts/current limit in amps) - 0.01OHM
The 0.01 ohm term takes into account any wire bond and lead
resistance. Since the 0.65 volt term is obtained from the base
emitter voltage drop of a bipolar transistor: the equation only holds
true for operation at +25C case temperature. The curve below
illustrates the effect of case temperature on 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 115, 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 7 and 12).
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.
MECHANICAL SPECIFICATIONS
M.S. Kennedy Corp.
4707 Dey Road, Liverpool, New York 13088
Phone (315) 701-6751
FAX (315) 701-6752
www.mskennedy.com
NOTE: ALL DIMENSIONS ARE 0.010 INCHES UNLESS OTHERWISE LABELED.
Rev. A 6/02
5
Screening Level
Part
Number
MSK115
MSK 115E
MSK115B
Industrial
Extended Reliability
Mil-PRF-38534 Class H
ORDERING INFORMATION
MSK 115
ESD TRIANGLE INCICATES PIN 1.
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