MIL-PRF-38534 AND 38535 CERTIFIED FACILITY
M.S KENNEDY CORP.
4707 Dey Road Liverpool, N.Y. 13088
HIGH POWER
HIGH POWER
OP-AMP
OP-AMP
0021
SERIES
(315) 701-6751
FEATURES:
Available as SMD #5962-8508801
High Output Current - 2 Amps Peak
Low Power Consumption-Class C Design
Programmable Current Limit
High Slew Rate
Continuous Output Short Circuit Duration
Replacement for LH0021
Functionally Equivalent Rad Hard Device MSK 106RH
MSK0021FP
MSK0021
DESCRIPTION:
MSK0021FPG
The MSK 0021, 0021FP and 0021FPG are general purpose Class C power operational amplifiers. These amplifiers
offer large output currents, making them 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
two external resistors. These devices are also compensated with a single external capacitor. The MSK 0021 is available
in a hermetically sealed 8 pin TO-3 package. The MSK 0021FP is packaged in a 20 pin hermetic metal flatpack and the
0021FPG is lead formed by MSK.
EQUIVALENT SCHEMATIC
PIN-OUT INFORMATION
MSK0021
1 ISC+
2 +VCC
3 GND
4 Compensation
5 -Input
6 +Input
7 -VCC
8 -ISC
CASE-OUTPUT
MSK0021FP/MSK0021FPG
1
2
3
4
5
6
7
8
9
10
20 -VCC
ISC-
19 NC
ISC-
18 +VIN
ISC-
17 NC
VOUT
16 -VIN
VOUT
15 NC
VOUT
14 Compensation
VOUT
13 NC
ISC+
12 GND
ISC+
11 +VCC
ISC+
CASE IS ALSO VOUT
8548-83 Rev. D 11/12
TYPICAL APPLICATIONS
Servo Amplifer
Motor Driver
Audio Amplifier
Programmable Power Supply
1
ABSOLUTE MAXIMUM RATINGS
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8
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ELECTRICAL SPECIFICATIONS
Parameter
STATIC
Supply Voltage Range
2
Quiescent Current
Power Consumption
2
INPUT
Input Offset Voltage
Input Bias Current
Input Offset Current
Input Capacitance
Input Resistance
3
2
Test Conditions
Military
5
Group A
Subgroup Min. Typ. Max.
-
1, 2, 3
1,2,3
1
2, 3
1
2, 3
1
2,3
-
-
4
5,6
1
2,3
-
4
5,6
4
4
4
-
4
4
5,6
4
4
±12 ±15
-
±1.0
-
75
-
-
-
-
-
-
-
0.3
70
70
80
80
-
±13.5
±13.5
±11
0.8
50
-
1.5
100
88
-
-
±0.5
±2.0
±100
±0.4
±2.0
-
3
1.0
90
90
95
-
5
±14
±14
±12
1.2
150
4
3.0
105
96
0.3
5
±18
±3.5
105
±3.0
±5.0
±300
±1.0
±100
±300
-
-
-
-
-
-
-
Industrial
4
Min. Typ. Max.
±12 ±15 ±18
-
±1.0 ±4.0
120
-
90
-
-
-
-
-
-
-
0.3
70
-
80
-
-
±0.5 ±5.0
-
-
±150 ±500
-
-
±2.0 ±300
-
-
-
3
-
1.0
-
90
-
-
-
95
-
-
-
5
-
-
-
1.7
250
-
-
-
-
1.2
20
V
IN
= 0V
V
IN
= 0V
V
IN
= 0V
V
CM
= 0V
Either Input
V
CM
= 0V
F=DC
F=DC
F = 10H
Z
V
CM
= ±10V
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Input Noise Voltage
OUTPUT
3
V
CC
= ±5V to ±15V
F = 10H
Z
to 10KH
Z
R
L
=100Ω F =100H
Z
R
L
=10Ω
R
SC
= 0.5Ω
R
SC
= 5Ω
0.1%
F =100H
Z
V
OUT
= MAX
V
OUT
= GND
2V step
R
L
= 100Ω
Output Voltage Swing
Output Short Circuit Current
Settling Time
3
TRANSFER CHARACTERISTICS
Slew Rate
Open Loop Voltage Gain
Transition Times
Overshoot
-
±13.0 ±14
-
-
-
-
±10.5 ±12
1.6
0.7
1.2
250
50
150
-
-
4
-
-
-
1.0
20
1.2
100
-
-
-
3.0
105
-
0.3
5
V
OUT
= ±10V
F = 10H
Z
R
L
= 1KΩ
Rise and Fall
Small Signal
NOTES:
1
2
3
4
5
Unless otherwise specified, ±V
CC
= ±15V, C
C
= 3000pF.
Guaranteed by design but not tested.
Typical parameters are representative of actual device performance but are for reference only.
Industrial devices shall be tested to subgroups 1 and 4 unless otherwise specified.
Military grade devices (B/H suffix) shall be 100% tested to subgroups 1, 2, 3 and 4.
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
6 Reference DSCC SMD 5962-8508801 for electrical specifications for devices purchased as such.
7 Subgroup 5 and 6 testing available upon request.
8 Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.
2
8548-83 Rev. D 11/12
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2.0° C/W
6.0° C/W
-55°C to +125°C
-40°C to +85°C
Units
V
mA
mW
mV
μV/°C
nA
μA
nA
nA
pF
MΩ
dB
dB
dB
dB
μV
RMS
V
V
V
A
mA
μS
V/μS
dB
dB
μS
%
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P
D
T
J
T
C
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±V
CC
I
OUT
V
IN
V
IN
R
TH
Supply Voltage
Peak Output Current
Differential Input Voltage
Common Mode Input Voltage
Thermal Resistance-Junction to Case
MSK 0021
MSK 0021FP/FPG
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±18V
2A
±30V
±15V
T
ST
T
LD
Storage Temperature Range
Lead Temperature Range
(10 Seconds)
Power Dissipation (TO-3)
Junction Temperature
Case Operating Temperature Range
Military Versions (H/B)
Industrial Versions
-65° to +150°C
300°C
6W
150°C
HEAT SINKING
To select the correct heat sink for your application, refer to the
thermal model and governing equation below.
CURRENT LIMIT
Thermal Model:
The MSK 0021 has an on-board current limit scheme de-
signed 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.
R
SC
=
0.7
___
I
SC
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.
POWER SUPPLY BYPASSING
Both the negative and the positive power supplies must
be effectively decoupled with a high and low frequency by-
pass 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 high power op-amps, such as the MSK
0021, to place a 30-50 microfarad 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 pack-
age power supply pins as possible.
Example:
(TO-3 PACKAGE)
In our example the amplifier application requires the output to drive
a 10 volt peak sine wave across a 10 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
±15 VDC.
1.) Find Power Dissipation
P
D
=[(quiescent current) X (+V
CC
- (-V
CC
))] + [(V
S
- V
O
) X I
OUT
]
=(3.5 mA) X (30V) + (5V) X (1A)
=0.1W + 5W
=5.1W
2.) For conservative design, set T
J
= +125°C.
3.) For this example, worst case T
A
= +25°C.
4.) R
θJC
= 2.0°C/W typically for the TO-3 package.
5.) Rearrange governing equation to solve for R
θSA:
R
θSA
= (T
J
- T
A
) / P
D
- (R
θJC
) - (R
θCS
)
= (125°C - 25°C) / 5.1W - (2.0°C/W) - (0.15°C/W)
= 17.5°C/W
The heat sink in this example must have a thermal resistance of no
more than 17.5°C/W to maintain a junction temperature of less than
+125°C.
3
SAFE OPERATING AREA
The safe operating area curve is a graphical representation
of the power handling capability of the amplifier under vari-
ous 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.
8548-83 Rev. D 11/12
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APPLICATION NOTES
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