ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
ULTRA HIGH VOLTAGE
OPERATIONAL AMPLIFIER
164
(315) 701-6751
4707 Dey Road Liverpool, N.Y. 13088
MIL-PRF-38534 QUALIFIED
FEATURES:
Monolithic MOS Technology
External Compensation And Null Capability
High Voltage Operation : 350V
Low Quiescent Current : 2mA Max.
High Output Current : 60mA Min.
No Second Breakdown
High Speed : 40V/µS Typ.
Low Cost
MSK164
DESCRIPTION:
The MSK 164 is an ultra high voltage monolithic MOSFET operational amplifier ideally suited for electrostatic
transducer and electrostatic deflection applications. With a total supply voltage rating of 350 volts and 60mA of
available output current, the MSK 164 is also an excellent low cost choice for high voltage piezo drive circuits. The
MOSFET output frees the MSK 164 from secondary breakdown limitations and power dissipation is kept to a minimum with a quiescent current rating of only 2mA. The MSK 164 has user adjustable compensation and output null
pins and is packaged in a 14 pin power dip with bolt down tabs.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
Piezo Electric Positioning
Electrostatic Deflection
Computer to Vacuum Tube Interface
Ultra High Voltage Op-Amp Applications
PIN-OUT INFORMATION
1
2
3
4
5
6
7
Balance 1
Balance 2
-Vcc
+Vcc
Output Drive
Comp 1
Comp 2
1
14
13
12
11
10
9
8
Non-Inverting Input
Inverting Input
N/C
N/C
N/C
N/C
Current Sense
Rev. A 8/00
ABSOLUTE MAXIMUM RATINGS
VCC 2
±IOUT
±IOUTP
VIND
VIN
TJ
Total Supply Voltage
Output Current (within S.O.A.)
Output Current Peak
Input Voltage (Differential)
Input Voltage (Common Mode)
Junction Temperature
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TST Storage Temperature
TLD Lead Temperature
TC Case Operating Temperature
(MSK164B)
(MSK164)
RTH Thermal Resistance (DC)
Junction to Case
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350V
60mA
120mA
±16V
±Vcc
150°C
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-65°C to +150°C
300°C
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-55°C to +125°C
-40°C to +85°C
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12°C/W
ELECTRICAL SPECIFICATIONS
Parameter
MSK164B
Group A
Test Conditions 1
Subgroup
Min.
-
±50
Typ.
MSK164
Units
Typ.
Max.
±150 ±175 ±50
±150
±175
V
Max.
Min.
STATIC
Supply Voltage Range 2 4 9
Quiescent Current
VIN=0V
1
-
±1.4
±2.0
-
±1.4
±2.0
mA
2
-
±2.0
±3.0
-
-
-
mA
3
-
±1.0
±2.1
-
-
-
mA
INPUT
Offset Voltage
VIN=0V
1
-
±15
±30
-
±15
±30
mV
Offset Voltage Drift 4
VIN=0V
2,3
-
±40
±65
-
±40
-
µV/°C
Offset Voltage vs ±Vcc 4
VIN=0V
1
-
±20
±32
-
±20
±32
µV/V
Input Bias Current 4
VCM=0V
1,3
-
±5
±50
-
±5
±100
pA
2
-
-
-
-
-
nA
-
-
10
-
Ω
-
-
pF
-
Input Impedance 4
(DC)
Input Capacitance 4
Common Mode Rejection 4
Noise
VCM=±90VDC
±50
11
-
-
10
5
-
-
5
-
84
94
-
84
94
-
dB
-
50
-
50
-
µVRMS
V
11
1Hz≤f≤10Hz
-
IOUT=±40mA Peak
4
±138 ±141
-
±138 ±141
-
VOUT=MAX
4
±60
±120
-
±60
±120
-
mA
-
OUTPUT
Output Voltage Swing
Output Current
Power Bandwidth 4
Resistance 4
Settling Time to 0.1% 3 4
Capacitive Load 4
CC=10pF VOUT=280VPP
-
-
26
-
-
26
-
KHz
No Load RCL=0Ω
-
-
150
-
-
150
-
Ω
CC=10pF 10V Step
-
-
12
-
-
12
-
µS
AV=+1V/V
-
10
-
-
10
-
-
nF
CC=Open
4
20
40
-
20
40
-
V/µS
F=15Hz RL=5KΩ
4
94
106
-
94
106
-
dB
TRANSFER CHARACTERISTICS
Slew Rate
Open Loop Voltage Gain
NOTES:
1
2
3
4
5
6
7
8
Unless otherwise noted CC=18pF, RC=2.2KΩ, ±VCC= ±150VDC, null pins 1 and 2 are N/C.
Derate maximum supply voltage 0.5V/°C below TC=+25°C. No derating is needed above TC=25°C.
AV=-10V/V measured in false summing junction circuit.
Devices shall be capable of meeting the parameter, but need not be tested. Typical parameters are for reference only.
Industrial grade devices shall be tested to subgroups 1 and 4 unless otherwise requested.
Military grade devices ('B' suffix) shall be 100% tested to subgroups 1,2,3 and 4.
Subgroup 5 and 6 testing available upon request.
Subgroup
1,4 TC=+25°C
Subgroup
2,5 TC=+125°C
Subgroup
3,6 TA=-55°C
9 Electrical specifications are derated for power supply voltages less than ±50VDC.
2
Rev. A 8/00
APPLICATION NOTES
CURRENT LIMIT
Current limit resistor value can be calculated as follows:
RCL=3/ILIM
It is recommended that the user set up the value of current limit
as close as possible to the maximum expected output current
to protect the amplifier. The minumum value of current limit
resistance is 33 ohms. The maximum practical value is 500
ohms. Current limit will vary with case temperature. Refer to
the typical performance graphs as a guide. Since load current
passes through the current limit resistor, a loss in output voltage swing will occur. The following formula approximates output voltage swing reduction:
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational amplifier has two distinct limitations:
1. The current handling capability of the die metallization.
2. The junction temperature of the output MOSFET's.
NOTE: The output stage is protected against transient flyback.
However, for protection against sustained, high energy flyback,
external fast-recovery reverse biased diodes should be connected
from the output to ground.
VR=IO * RCL
When the device is in current limit, there will be spurious oscillations present on the negative half cycle. The frequency of
the oscillation is application dependent and can not be predicted. Oscillation will cease when the device comes out of
current limit.
INPUT PROTECTION
Input protection circuitry within the MSK 164 will clip differential input voltages greater than 16 volts. The inputs are also
protected against common mode voltages up to the supply rails
as well as static discharge. There are 300 ohm current limiting
resistors in series with each input. These resistors may become damaged in the event the input overload is capable of
driving currents above 1mA. If severe overload conditions are
expected, external input current limiting resistors are recommended.
OUTPUT SNUBBER NETWORK
A 100 ohm resistor and a 330pF capacitor connected in series from the output of the amplifier to ground is recommended
for applications where load capacitance is less than 330pF.
For larger values of load capacitance, the output snubber network may be omitted. If loop stability becomes a problem due
to excessively high load capacitance, a 100 ohm resistor may
be added between the output of the amplifier (the junction of
RCL and pin 8) and the load. A small tradeoff with bandwidth
must be made in this configuration. The graph below illustrates the effect of capacitive load on open loop gain. Note
that the snubber capacitor must have a voltage rating greater
than or equal to the total rail to rail power supply voltage.
STABILITY
The MSK 164 has sufficient phase margin when compensated for unity gain to be stable with capacitive loads of at
least 10nF. However, it is recommended that the parallel sum
of the input and feedback resistor be 1000 ohms or less for
closed loop gains of ten or less to minimize phase shift caused
by the R-C network formed by the input resistor, feedback resistor and input capacitance. The user can tailor the performance of the MSK 164 to their application using the external
compensation pins. The graphs of small signal gain and phase
as well as the graphs of slew rate and power response demonstrate the effect of various forms of compensation. The compensation capacitor must be rated at 350 volts working voltage
if maximum power supply voltages are used. The compensation resistor and capacitor lead lengths must be kept as short
as possible to minimize spurious oscillations. A high quality
NPO capacitor is recommended for the compensation capacitor.
EXTERNAL COMPENSATION
External compensation is only necessary at gains of 30V/V
or less. For larger gains, the compensation resistor and capacitor may be omitted. An effective method of checking amplifier
stability is to apply the worst case capacitive load to the output
of the amplifier and drive a small signal square wave across it.
If overshoot is less than 25%, the system will generally be
stable.
Rev. A 8/00
3
TYPICAL PERFORMANCE CURVES
4
Rev. A 8/00
MECHANICAL SPECIFICATIONS
MSK164
ESD TRIANGLE INDICATES PIN 1.
ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.
ORDERING INFORMATION
Part
Number
MSK164
MSK164B
Screening Level
Industrial
Military-Mil-PRF-38534
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.
5
Rev. A 8/00