MIL-PRF-38534 CERTIFIED
M.S.KENNEDY CORP.
4707 Dey Road Liverpool, N.Y. 13088
DUAL HIGH VOLTAGE/
VERY HIGH CURRENT
OPERATIONAL AMPLIFIER
186
(315) 701-6751
FEATURES:
Space Efficient Dual Amplifier
High Voltage Operation:
Single Supply: +8V to +60V
Dual Supply: ±4V to±30V
High Output Current: 8 Amp Continuous Per Amplifier
High Speed: 9V/µS
Low Quiescent Current: 26 mA Per Amplifier Typ.
Adjustable Current Limits
Thermal Shutdown
Enable/Status Pin For Output Disable Control
Available with Three Lead Form Configurations
Contact MSK for MIL-PRF-38534 Qualification Status
DESCRIPTION:
The MSK 186 is a dual high power operational amplifier ideal for use with a wide variety of loads. With operation
from either single or dual supplies, it offers excellent design flexibility. Power dissipation is kept to a minimum with a
quiescent current rating of only 26mA per amplifier, while 8 Amps of continuous available output current makes it a
very good low cost choice for motor drive circuits and audio amplification. The design is internally protected against
current overloads and overtemperature conditions. The current limit can also be user-selected through the use of a
resistor/potentiometer or voltage out/current out DAC. The MSK 186 is packaged in a hermetically sealed, isolated 18
pin power DIP with bolt down tabs for applications that require heat sinking.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
Servo Driver
Actuator Driver
Audio Amplifier
Power Supplies
Bridge Amps
Stereo Amps
PIN-OUT INFORMATION
1
2
3
4
5
6
7
8
9
-VCC 1
+VCC 1
OUTPUT 1
OUTPUT 2
+VIN 2
-VIN 2
VR 2
ILIM 2
E/S 2
18
17
16
15
14
13
12
11
10
E/S 1
ILIM 1
VR 1
-VIN 1
+VIN 1
OUTPUT 2
OUTPUT 2
+VCC 2
-VCC 2
1
PRELIMINARY
Rev. A 11/05
ABSOLUTE MAXIMUM RATINGS
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7
ELECTRICAL SPECIFICATIONS
Parameter
STATIC
Supply Voltage Range 3
Quiescent Current (Per Amp)
-Vcc to +Vcc
V
IN
=0V
-
1
2,3
Quiescent Current (Per Amp)
Overcurrent or TempShutdown Mode V
IN
=0V
INPUT
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current 3
Input Offset Current 3
Input Impedance
Input Capacitance
V
IN
=0V
V
IN
=0V
V
IN
=0V
V
IN
=OV
f=DC Differential
f=DC Differential
1
-
1
1
-
-
1
-
-
-
-
±1
-
-
80
-
±1
±20
±7.5
-
-
-
-
-
-
-
75
-
±1
±20
±100
±5
10
7
6
95
70
±10
-
±750
±75
-
-
-
-
mV
µV/°C
-
8
-
-
-
-
±26
±26
±6
60
±35
±38
-
8
-
-
-
-
±26
-
±6
60
±38
-
-
V
mA
mA
mA
Test Conditions
1
2
Group A
Subgroup
Min.
MSK186H/E
Typ.
Max.
Min.
MSK186
Typ.
Max.
Units
±100 ±500
±5
10
6
95
70
7
±50
-
-
-
-
Common Mode Rejection Ratio 3 (-V
CC
)-
0.1
≤
V
IN
≤
(+V
CC)
-
3V
Input Voltage Noise Density
OUTPUT
Output Voltage Swing
Output Current 3
I
OUT
=2.0A
I
OUT
=8.0A
Continuous
V
E/S
High- Output Enabled E/S Open or High
Enable/
Shutdown Input 3
V
E/S
Low- Output Disabled E/S Forced Low
I
E/S
High- Output Enabled E/S Indicates High
I
E/S
Low- Output Disabled E/S Indicates Low
Output Disable Time
Output Enable Time
TRANSFER CHARACTERISTICS
Slew Rate
Open Loop Voltage Gain 3
Settling Time ±0.1%
3
A
V
=1 V
OUT=
50Vp-p R
L
=4Ω
V
OUT
=±25V R
L
=1KΩ
A
V
=-10 50V Step
3
f=1KH
Z
4
4
4
4
4
-
-
-
-
±26.5
±25
±8
VR+2.4
-
-
-
-
-
±27.5
±26
-
-
-
-50
-55
1
3
-
-
-
-
VR+0.8
-
-
-
-
±26.5 ±27.5
±25
±8
VR+2.4
-
-
-
-
-
±26
-
-
-
-50
-55
1
3
-
-
-
-
VR+0.8
-
-
-
-
-
4
-
-
100
-
9
110
20
-
-
-
-
100
-
9
110
20
-
-
-
NOTES:
Unless otherwise specified ±V
CC
= ±30VDC, V
R
=0V and E/S Pin is open.
All electrical specifications apply to each amplifier.
Devices shall be capable of meeting the parameter, but need not to be tested. Typical parameters are for reference only.
Industrial grade and 'E' suffix devices shall be tested to subgroups 1 and 4 unless otherwise specified.
Military grade devices ('H' suffix) shall be 100% tested to subgroups 1,2,3 and 4.
Subgroup 1,4 T
A
=T
C
=+25°C
Subgroup 2 T
A
=T
C
=+125°C
Subgroup 3 T
A
=T
C
=-55°C
7 Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.
1
2
3
4
5
6
2
PRELIMINARY
Rev. A 11/05
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V
CC
±I
OUT
V
IND
V
CM
T
J
Total Supply Voltage
60V
Peak Output Current (within S.O.A.)
10A
Input Voltage
(-VCC)-0.5V to (+VCC)+0.5V
Input Voltage
(-VCC)-0.1V to (+VCC)-3V
Junction Temperature
Internal Protection
(See Application Note)
-65°C to +150°C
T
ST
Storage Temperature Range
300°C
T
LD
Lead Temperature Range
(10 seconds)
T
C
Case Operating Temperature
-55°C to +125°C
MSK186H/E
-25°C to +85°C
MSK186
R
TH
Thermal Resistance (Per Amplifier)
1.2°C/W
Junction to Case @ 125°C
n
A
n
A
Ω
pF
dB
nV/
√H
Z
V
V
A
V
V
µA
µA
µS
µS
V/µS
dB
µS
APPLICATION NOTES
POWER SUPPLIES:
For the MSK 186 maximum total supply voltage is specified
as 60V. However, dual and unbalanced power supply operation
is permissible as long as total supply voltage does not exceed
60V.
THERMAL PROTECTION:
The amplifiers are equipped with thermal protection circuitry
that protects each amplifier from damage caused by excessive
junction temperature. The output is disabled when the junction
temperature reaches approximately 160°C. After the junction
temperature cools to approximately 140°C, the output is again
enabled. The thermal protection may cycle on and off depend-
ing on the output load and signal conditions; this may have an
undesirable effect on the load.
It should be noted that even though this internal protection
circuitry does protect against overload conditions, it does not
take the place of proper heat sinking. For reliable operation,
junction temperature should be limited to 150°C, maximum.
POWER SUPPLY BYPASSING:
Power supply terminals 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 0.1µF ceramic capacitor in parallel with a 10µF tantalum
capacitor for each power supply pin to ground. In addition, it is
recommended that a 0.01µF capacitor be placed between ±Vcc
as close to the amplifiers as possible.
ENABLE/STATUS PIN:
For the MSK 186 this pin actually has a dual function. First,
when the pin is forced low, the output stage is disabled. Sec-
ond, it can be monitored to determine if the device is in thermal
shutdown. These functions can be used on the same device
with either single or dual supplies. For normal operation, the
E/S pin must be left open or pulled at least 2.4 volts above the
VR
pin. In noisy applications, a small value capacitor between
the E/S pin and VR may be required.
To disable the output, the user must pull the E/S pin low, no
greater than 0.8V above VR. To once again enable the device,
the E/S pin must be brought at least 2.4 volts above VR or be
disconnected. It should be noted that when the E/S pin is high,
the internal thermal shutdown is still active.
If the E/S pin is used to monitor thermal shutdown, during
normal operation the voltage on the E/S pin is typically 3.5V
above VR. Once shutdown has occurred this voltage will drop
to approximately 350mV above VR.
CURRENT LIMIT:
The MSK 186 offers accurate, user-selectable current limit.
Unlike typical designs that use a power resistor in series with
the output to sense load, the MSK 186 senses the load indi-
rectly and therefore does not require a resistor to handle the full
output current. Current limit is selected by controlling the input
to the I
LIM
pin (0 to 633µA).
The easiest method is to use a resistor or potentiometer
connected between VR and the I
LIM
pin. Use the following equa-
tion to select proper resistor value:
R
CL
= 75,000 -7.5KΩ
I
LIM
A low level control signal (0-633µA) can also be used to con-
trol the current level digitally. If the pin is left open, the current
is programmed to OA, while connecting I
LIM
directly to VR sets
the output current to it's maximum, typically 10A.
SAFE OPERATING AREA:
The safe operating area curve is a graphical representation of
the power handling capability of the amplifier under various
conditions. Power dissipation of the device is equal to the prod-
uct of the voltage across the output transistor times the output
current. As can be seen in the curve on page 5, safe operating
current decreases with an increase in temperature as well as an
increase in the voltage across the output transistor. Therefore,
for maximum amplifier performance it is important to keep case
temperature as low as possible and to keep ±Vcc as close to
the output rail as achievable.
VR PIN
The MSK 186 features a reference (VR) pin to which the I
LIM
and the E/S pin are referred. VR simply provides a reference
point accessible to the user that can be set to V-, ground, or
any reference of the user's choice. VR cannot be set below the
negative supply or above (V+)-8V. If the minimum V
S
is used,
VR must be set at V-.
COMPENSATION:
For normal operation output compensation is not typically
required. However, if the MSK 186 is intended to be driven into
current limit the user may find that an R/C network is required.
A snubber network from the output to ground for each ampli-
fier will provide stability. If driving large capacitive or inductive
loads, a snubber network will also enhance stability. Typically
3Ω to 10Ω in series with 0.01µF is acceptable.
3
TYPICAL CONNECTION DIAGRAM
PRELIMINARY
Rev. A 11/05
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