ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
POWER
OPERATIONAL AMPLIFIER
4707 Dey Road Liverpool, N.Y. 13088
115
(315) 701-6751
MIL-PRF-38534 QUALIFIED
FEATURES:
High Output Current - 15A peak
Ultra Low Thermal Resistance - 0.43°C/W
Excellent Linearity - Class A/B Output
Wide Supply Range - ±10V to ±50V
High Power Dissipation - 175W at TC=125°C
Output Short Circuit Protected
User Programmable Current Limit
Isolated Case Allows Direct Heat Sinking
Low Quiescent Current -±22mA. Typ
MSK 115
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 125°C. The
amplifier is packaged in a hermetic plug in power package with bolt down tabs.
EQUIVALENT SCHEMATIC
EQUIVALENT
SCHEMATIC
TYPICAL APPLICATIONS
TYPICAL APPLICATIONS
PIN-OUT INFORMATION
1
2
3
4
5
6
Magnetic Deflection Circuit Driver
Programmable Power Supplies
Motor, Valve and Actuator Control
Audio Amplifier
1
+VCC
Balance
Inverting Input
Non-Inverting Input
Balance
-VCC
12
11
10
9
8
7
+VC
+Current Limit
Output
Output
-Current Limit
-VC
Rev. A 6/02
ABSOLUTE MAXIMUM RATINGS
±VCC
IOUT
VIN
TC
Supply Voltage
±50V
Output Current
15A
Differential Input Voltage
±37V
Case Operating Temperature Range
(MSK 115B/E)
-55°C to+125°C
(MSK 115)
-40°C to +85°C
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TST Storage Temperature Range
TLD Lead Temperature Range
(10 Seconds)
PD Power Dissipation
TJ Junction Temperature
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-65°C to +150°C
300°C
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See S0A Curve
175°C
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ELECTRICAL SPECIFICATIONS
±Vcc=40VDC Unless Otherwise Specified
Group A
Test Conditions
Parameter
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MSK 115B/E
Subgroup Min.
MSK 115
Typ.
Max.
Min.
Typ.
Max.
Units
STATIC
2
Supply Voltage Range
-
±10
-
±50
±10
-
±50
V
VIN=0V
1
-
±22
±35
-
±22
±40
mA
A V=-10V/V
2,3
-
±28
±45
-
-
-
mA
Junction to Case
-
-
0.43
0.55
-
0.43
0.6
°C/W
1
-
±2
±6
-
±2
±10
mV
Bal.Pins=NC
2,3
-
±3
±12
-
-
-
mV
RPOT=10KΩ To -VCC AV=-10V/V
1
Adjust to zero
Adjust to zero
mV
2,3
Adjust to zero
Quiescent Current
Thermal Resistance
2
INPUT
VIN=0V
Input Offset Voltage
Input Offset Adjust
Input Bias Current
Input Offset Current
Input Impedance
-
-
mV
1
-
±10
±30
-
±10
±50
nA
Either Input
2,3
-
±15
±60
-
-
-
nA
VCM=0V
1
-
±5
±30
-
±5
±50
nA
2,3
-
±10
±50
-
-
-
nA
-
50
250
-
35
250
-
MΩ
-
-
±35
-
-
±35
-
V
VCM=±5V
-
80
100
-
74
100
-
dB
RL=500Ω AV=-10V/V
4
±35
±37
-
±33
±37
-
V
RL=10Ω RSC ≤ 0.02Ω
4
±35
±37
-
±33
±37
-
V
4
15
-
-
10
-
-
A
0.1% 10V step
-
-
2
-
-
5
-
µS
V/µS
2
Common Mode Rejection Ratio 2
-
VCM=0V
F=DC
2
Common Mode Range
AV=10V/V
F=100Hz
OUTPUT
Output Voltage Swing
AV=-10V/V
Output Current, Peak
Settling Time 1 2
TJ<175°C
TRANSFER CHARACTERISTICS
VOUT=±10V RL=500Ω AV=-10V/V
4
2.5
5
-
1
2.5
-
Open Loop Voltage Gain
2
RL=500Ω F=10Hz
4
95
105
-
85
105
-
dB
Gain Bandwidth Product
2
RL=10Ω F=1 MHz
-
-
4
-
-
3
-
MHz
Slew Rate
NOTES:
1
2
3
4
5
6
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.
TA=TC=+25°C
Subgroup 1,4
TA=TC=+125°C
Subgroup 2,5
TA=TC=-55°C
Subgroup 3,6
2
Rev. A 6/02
APPLICATION NOTES
HEAT SINKING
CURRENT LIMIT
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.
The MSK 115 has an on-board current limit scheme designed to
shut off the output drivers anytime output current exceeds a predetermined limit. The following formula may be used to determine the
value of current limit resistance necessary to establish the desired
current limit.
Thermal Model:
RCL=(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 +25°C case temperature. The curve below
illustrates the effect of case temperature on current limit.
Governing Equation:
TJ=PD x (RθJC + RθCS + RθSA) + TA
Where
TJ=Junction Temperature
PD=Total Power Dissipation
RθJC=Junction to Case Thermal Resistance
RθCS=Case to Heat Sink Thermal Resistance
RθSA=Heat Sink to Ambient Thermal Resistance
TC=Case Temperature
TA=Ambient Temperature
TS=Sink Temperature
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
PD =[(quiescent current) x (VS-(VS))]+[(+VS-VO) x IOUT]
=(25mA) x (80V)+(20V) x (1A)
=2W+20W
=22W
2.) For conservative design, set TJ=+125°C
3.) For this example, worst case TA=+50°C
4.) RθJC=0.55°C/W from MSK 115B Data Sheet
5.) RθCS=0.15°C/W for most thermal greases
6.) Rearrange governing equation to solve for RθSA
RθSA=((TJ-TA)/PD) - (RθJC) - (RθCS)
=((125°C -50°C)/22W) - (0.55°C/W) - (0.15°C/W)
=2.71°C/W
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 heat sink in this example must have a thermal resistance of
no more than 2.71°C/W to maintain a junction temperature of no
more than +125°C.
3
Rev. A 6/02
TYPICAL PERFORMANCE CURVES
4
Rev. A 6/02
MECHANICAL SPECIFICATIONS
MSK 115
ESD TRIANGLE INCICATES PIN 1.
NOTE: ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.
ORDERING INFORMATION
Part
Number
MSK115
MSK 115E
MSK115B
Screening Level
Industrial
Extended Reliability
Mil-PRF-38534 Class H
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.
Please visit our website for the most recent revision of this datasheet.
5
Rev. A 6/02