ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
HIGH VOLTAGE/HIGH CURRENT
OPERATIONAL AMPLIFIER
4707 Dey Road Liverpool, N.Y. 13088
181
(315) 701-6751
FEATURES:
MIL-PRF-38534 CERTIFIED
Low Cost
High Voltage Operation:
Single Supply: +8V to +60V
Dual Supply: ±4V to±30V
High Output Current: 3 Amp Continuous
High Speed: 10V/µS
Low Quiescent Current: 20 mA Typ.
Adjustable Current Limits
Thermal Shutdown
Monolithic Technology
Enable/Status Pin For Output Disable Control
MSK181Z
MSK181
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
PIN-OUT INFORMATION
TYPICAL APPLICATIONS
1
2
3
4
Servo Driver
Actuator Driver
Audio Amplifier
Power Supplies
1
+VIN
-VIN
ILIM
E/S
8
7
6
5
-Vcc
+Vcc
Output
N/C
PRELIMINARY Rev. C 8/01
ABSOLUTE MAXIMUM RATINGS
VCC
±IOUT
VIND
VIN
TJ
TST Storage Temperature Range
TLD Lead Temperature Range
(10 seconds)
TC Case Operating Temperature
(MSK181H/E)
(MSK181)
RTH Thermal Resistance
Junction to Case
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)
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
-65°C to +150°C
300°C
○
○
○
○
○
○
○
-55°C to +125°C
-40°C to +85°C
○
○
○
○
○
○
1.8°C/W
○
ELECTRICAL SPECIFICATIONS
MSK181H/E
Group A
Test Conditions 1
Parameter
MSK181
Units
Typ.
Max.
±4
-
±30
V
Subgroup
Min.
Typ.
Max.
Min.
-
±4
-
±30
STATIC
Supply Voltage Range 2
Quiescent Current
VIN=0V
Quiescent Current
Shutdown Mode VIN=0V
1
-
±17
±20
-
±17
±23
mA
2,3
-
±17
±20
-
-
-
mA
-
-
±6
-
-
±6
-
mA
INPUT
Input Offset Voltage
VIN=0V
1
-
±2
±10
-
±2
±15
mV
Input Offset Voltage Drift
VIN=0V
-
-
±30
-
-
±30
-
µV/°C
Input Bias Current 2
VIN=0V
1
-
±100 ±500
-
±100
±750
nA
Input Offset Current 2
VIN=OV
1
±1
-
±5
±75
nA
-
-
10 7
-
Ω
±50
±5
Input Impedance
f=DC
-
-
10
Input Capacitance
f=DC
-
-
6
-
-
6
-
pF
Common Mode Rejection Ratio 2 (-VCC)-0.1≤ VIN ≤ (+VCC)-3V
1
80
95
-
75
95
-
dB
Input Voltage Noise Density
-
-
90
-
-
90
-
nV/√HZ
IOUT=0.6A 2
4
±27
±28
-
±26
±28
-
V
IOUT=3.0A
4
±25.5
±26
-
±24
±26
-
V
DC=Continuous
4
±3
-
-
±3
-
-
A
-
V
f=1KHZ
7
OUTPUT
Output Voltage Swing
Output Current
VES High- Output Enabled E/S Open or High
4
-27.5
-
-
-27.5
-
VES Low- Output Disabled E/S Forced Low
4
-
-
-29
-
-
-29
V
Output Disable Time
-
-
1
-
-
1
-
µS
Output Enable Time
-
-
3
-
-
3
-
µS
AV=1 VOUT= 50Vp-p RL=8Ω
-
-
10
-
-
8
-
V/µS
VOUT=±25V RL=1KΩ
4
90
98
-
88
98
-
dB
AV=10 50V Step
-
-
15
-
-
18
-
µS
Shutdown Input Mode
TRANSFER CHARACTERISTICS
Slew Rate
Open Loop Voltage Gain 2
Settling Time ±0.1% 2
NOTES:
1
2
3
4
5
Unless otherwise specified ±VCC= ±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 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 TA=TC=+25°C
Subgroup 2 TA=TC=+125°C
Subgroup 3
TA=TC=-55°C
2
PRELIMINARY Rev. C 8/01
APPLICATION NOTES
POWER SUPPLIES:
THERMAL PROTECTION:
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.
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 depending 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 MSK 181 as possible.
ENABLE/STATUS PIN:
CURRENT LIMIT:
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 device, 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.
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 indirectly and therefore does not require a resistor to handle the full
output current. Current limit is selected by controlling the input
to the ILIM pin.
The easiest method is to use a resistor or potentiometer connected between-Vcc and the ILIM pin. Use the following equation to select proper resistor value:
71,250
-13.75KΩ
Rcc=
ILIM
A low level control signal (0-330µA) can also be used to control the current level digitally. If the pin is left open, the current
is programmed to OA, while connecting ILIM directly to -Vcc
sets the output current to it's maximum, typically 5A.
SAFE OPERATING AREA:
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 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.
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 product 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 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.
TYPICAL CONNECTION DIAGRAM
3
PRELIMINARY Rev. C 8/01
APPLICATION NOTES cont.
Figure 2
Output Disable with a Single Supply
Figure 1
Adjustable Current Limit
Figure 4
Motor Drive Circuit
Figure 3
Thermal Shutdown Status With a Single Supply
Figure 6
Parallel Output For Increased Output Current
Figure 5
Voltage Source
4
PRELIMINARY Rev. C 8/01
TYPICAL PERFORMANCE CURVES
5
PRELIMINARY Rev. C 8/01
MECHANICAL SPECIFICATIONS
MSK181Z
MSK181
ESD TRIANGLE INDICATES PIN 1.
ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.
ORDERING INFORMATION
MSK181
H
Z
PACKAGE STYLE
BLANK= NO TAB; Z= Z TAB
SCREENING
BLANK = INDUSTRIAL; E = EXTENDED RELIABILITY
H = MIL-PRF-38534
GENERAL PART NUMBER
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.
6
PRELIMINARY Rev. C 8/01