MIL-PRF-38534 CERTIFIED FACILITY
M.S.KENNEDY CORP.
FEATURES:
HIGH VOLTAGE/HIGH CURRENT
OPERATIONAL AMPLIFIER
181
(315) 701-6751
4707 Dey Road Liverpool, N.Y. 13088
Available to DSCC SMD 5962-92152
Low Cost
High Voltage Operation:
Single Supply: +8V to +60V
Dual Supply: ±4V to±30V
High Output Current: 3 Amp Continuous
High Speed: 10V/ S
Low Quiescent Current: 20 mA Typ.
Adjustable Current Limits
Thermal Shutdown
Monolithic Technology
Enable/Status Pin For Output Disable Control
MSK181
MSK181Z
DESCRIPTION:
The MSK 181 is a high power monolithic operational amplifier ideal for use with a wide variety of loads. With operation from
either single or dual supplies, the MSK 181 offers excellent design flexibility. Power dissipation is kept to a minimum with a
quiescent current rating of only 20mA, while 3 Amps of continuous available output current makes the MSK 181 a very good low
cost choice for motor drive circuits and audio amplification. The MSK 181 is internally protected against current overloads and
overtemperature conditions. Current limit can also be user-selected through the use of a resistor/potentiometer or voltage out/
current out DAC. The MSK 181 is packaged in a hermetically sealed 8 pin power dip and the MSK 181Z is offered with bolt down
tabs for applications that require heat sinking.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
Servo Driver
Actuator Driver
Audio Amplifier
Power Supplies
1
PIN-OUT INFORMATION
1
2
3
4
+VIN
-VIN
ILIM
E/S
8
7
6
5
-VCC
+VCC
OUTPUT
N/C
8548-1 Rev. L 10/11
ABSOLUTE MAXIMUM RATINGS
V
CC
±I
OUT
V
IND
V
IN
T
J
8
Total Supply Voltage
60V
Output Current (within S.O.A.)
5A
Input Voltage (Differential)
±29.5V
Input Voltage (Common Mode) +27V/-29V
Junction Temperature
Internal Protection
(See Application Note)
ELECTRICAL SPECIFICATIONS
Parameter
6
STATIC
Supply Voltage Range 2
Quiescent Current
Quiescent Current
INPUT
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current 2
Input Offset Current 2
Input Impedance
Input Capacitance
V
IN
=0V
V
IN
=0V
V
IN
=0V
V
IN
=OV
f=DC
f=DC
(+V
CC)
-
3V
V
IN
=0V
Shutdown Mode V
IN
=0V
Test Conditions
1
T
ST
Storage Temperature Range
T
LD
Lead Temperature Range
(10 seconds)
T
C
Case Operating Temperature
(MSK181G) See Note 6
(MSK181)
R
TH
Thermal Resistance
Junction to Case
Group A
Subgroup
Min.
MSK181G
Typ.
Max.
Min.
-65°C to +150°C
300°C
-40°C to +125°C
-25°C to +85°C
2.5°C/W
MSK181
Typ.
Max.
Units
-
1
2,3
-
±4
-
-
-
-
±17
±19
±6
±30
±20
±23
-
±4
-
-
-
-
±17
-
±6
±30
±23
-
-
V
mA
mA
mA
1
-
1
1
-
-
1
-
-
-
-
±1
-
-
80
-
±2
±30
±10
-
-
-
-
-
-
-
75
-
±2
±30
±100
±5
10
6
95
90
7
±15
-
±750
±75
-
-
-
-
mV
V/°C
±100 ±500
±5
10
6
95
90
7
n
A
n
A
Ω
pF
dB
nV/
√H
Z
V
V
A
A
V
V
A
A
S
S
±50
-
-
-
-
Common Mode Rejection Ratio 2(-V
CC
)-
0.1
≤
V
IN
≤
Input Voltage Noise Density
OUTPUT
Output Voltage Swing
Output Current
Current Limit
f=1KH
Z
I
OUT
=0.6A
I
OUT
=3.0A
DC=Continuous
RCL=34KΩ 0.1%
V
E/S
High- Output Enabled E/S Open or High
1
1
1
1
4
4
-
-
-
-
±27
±25.5
±3
1.350
-27.5
-
-
-
-
-
±28
±26
-
1.5
-
-
-65
-70
1
3
-
-
-
±26
±24
±3
±28
±26
-
1.5
-
-
-65
-70
1
3
-
-
-
1.650
-
-29
-
-
-
-
1.650 1.350
-
-29
-
-
-
-
-27.5
-
-
-
-
-
Shutdown Input 2
V
E/S
Low- Output Disabled E/S Forced Low
I
E/S
High- Output Enabled E/S Open or High
I
E/S
Low- Output Disabled E/S Forced Low
Output Disable Time
Output Enable Time
TRANSFER CHARACTERISTICS
Slew Rate
Open Loop Voltage Gain 2
Settling Time ±0.1% 2
A
V
=1 V
OUT=
50Vp-p R
L
=500Ω
V
OUT
=±25V R
L
=1KΩ
A
V
=10 50V Step
4
4
-
6.0
90
-
10
98
15
-
-
-
5.0
88
-
10
98
18
-
-
-
V/ S
dB
NOTES:
1
2
3
4
5
Unless otherwise specified ±V
CC
= ±30VDC and E/S pin is open.
Devices shall be capable of meeting the parameter, but need not to 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 ('G' 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
=-40°C
6 Refer to SMD 5962-92152 for electrical parameters for devices purchased as such.
7 The operating temperature range is -55° to +125°C if the device is powered. The minimum cold start temperature is -40°C.
8 Continuous operation at or above absolute maximum ratings may adversly effect the device performance and/or life cycle.
2
8548-1 Rev. L 10/11
APPLICATION NOTES
POWER SUPPLIES:
The MSK 181 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 MSK 181 is equipped with thermal protection circuitry
that protects the 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 0.1 F ceramic capacitor in parallel with a 10 F tantalum
capacitor for each power supply pin to ground. In addition, it is
recommended that a 0.01 F capacitor be placed between ±Vcc
as close to the MSK 181 as possible.
ENABLE/STATUS PIN:
This pin actually has a dual function. First, when the pin is
forced low, the output stage is disabled. Second, 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 negative rail.
In noisy applications, a small value capacitor between the E/S
pin and -Vcc may be required.
To disable the output, the user must pull the E/S pin low, no
greater than 0.8V above -Vcc. To once again enable the de-
vice, the E/S pin must be brought at least 2.4 volts above -Vcc
or 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 -Vcc. Once shutdown has occurred this voltage will drop
to approximately 350mV above -Vcc.
CURRENT LIMIT:
The MSK 181 offers accurate, user-selectable current limit.
Unlike typical designs that use a power resistor in series with
the output to sense load, the MSK 181 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.
The easiest method is to use a resistor or potentiometer con-
nected between-Vcc and the I
LIM
pin. Use the following equa-
tion to select proper resistor value:
71,250 -13.75KΩ
Rcc=
I
LIM
A low level control signal (0-330 A) 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 -Vcc
sets the output current to it's maximum, typically 5A.
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, safe operating current
decreases with an increase in temperature as well as an in-
crease 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.
COMPENSATION:
For normal operation output compensation is not typically
required. However, if the MSK 181 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 will provide sta-
bility. If driving large capacitive or inductive loads, a snubber
network will also enhance stability. Typically 3Ω to 10Ω in se-
ries with 0.01 F is acceptable.
TYPICAL CONNECTION DIAGRAM
3
8548-1 Rev. L 10/11
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