4707 Dey Road Liverpool, N.Y. 13088
(315) 701-6751
MIL-PRF-38534 QUALIFIED
162/163
ULTRA HIGH VOLTAGE
OPERATIONAL AMPLIFIER
ISO-9001 CERTIFIED BY DSCC
EQUIVALENT SCHEMATIC
Piezo Electric Positioning
Electrostatic Deflection
Computer to Vacuum Tube Interface
Ultra High Voltage Op-Amp Applications
1
2
3
4
-Vcc
NC
Output Drive
Current Sense
8
7
6
5
PIN-OUT INFORMATION
TYPICAL APPLICATIONS
Inverting Input
Non-Inverting Input
NC
+Vcc
M.S.KENNEDY CORP.
MSK163
MSK162
FEATURES:
Monolithic MOS Technology
Low Cost
High Voltage Operation : 350V
Low Quiescent Current : 2mA Max.
High Output Current : 60mA Min.
No Secondary Breakdown
High Speed : 20V/S Typ.
Internally Compensated For Gains >10 V/V
The MSK 162 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
162 is also an excellent low cost choice for high voltage piezo drive circuits. The MOSFET output frees the MSK 162 from
secondary breakdown limitations and power dissipation is kept to a minimum with a quiescent current rating of only 2mA. The
MSK 162 is packaged in a hermetically sealed 8 pin power dip and is internally compensated for closed loop gains of 10 V/V or
greater. For applications requiring heat sinking, the MSK 163 is available with bolt down tabs and is otherwise identical to the MSK
162 (see mechanical specifications). If the application calls for a gain of less than 10 V/V, refer to the MSK 158/159 data sheet.
DESCRIPTION:
Rev. C 6/02
1
STATIC
Supply Voltage Range
INPUT
Offset Voltage
Offset Voltage Drift
Offset Voltage vs Vcc
Input Bias Current
Input Impedance
Input Capacitance
Common Mode Rejection
Noise
OUTPUT
Output Voltage Swing
Output Current
Power Bandwidth
Resistance
Settling Time to 0.1%
Capacitive Load
TRANSFER CHARACTERISTICS
Slew Rate
Open Loop Voltage Gain
Storage Temperature
Lead Temperature
Case Operating Temperature
(MSK162B/E/163B/E)
(MSK162/163)
Thermal Resistance (DC)
Junction to Case
350V
60mA
120mA
16V
Vcc
150C
Total Supply Voltage
Output Current (within S.O.A.)
Output Current Peak
Input Voltage (Differential)
Input Voltage (Common Mode)
Junction Temperature
-65C to +150C
300C
-55C to +125C
-40C to +85C
11C/W
1
2
3
4
5
6
7
8
9
ABSOLUTE MAXIMUM RATINGS
T
ST
T
LD
T
C
R
TH
V
CC
I
OUT
I
OUTP
V
IND
V
IN
T
J
Unless otherwise noted, VCC= 150VDC.
Derate maximum supply voltage 0.5V/C below TC=+25C. No derating is needed above TC=25C.
AV=-10V/V measured in false summing junction circuit.
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
Industrial grade and "E" suffix devices shall be tested to subgroups 1 and 4 unless otherwise requested.
Military grade and 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=+25C
Subgroup 2,5 Tc=+125C
Subgroup 3,6 T
A
=-55C
Electrical specifications are derated for power supply voltages less than 50VDC.
Group A
Subgroup
-
1
2
3
1
2,3
1
1
2,3
-
-
-
-
4
4
-
-
-
-
4
4
Typ.
150
1.4
2.0
1.0
15
40
20
5
-
10
5
94
50
141
120
26
150
12
-
20
106
Min.
50
-
-
-
-
-
-
-
-
-
-
84
-
138
60
-
-
-
10
10
94
Min.
50
-
-
-
-
-
-
-
-
-
-
84
-
138
60
-
-
-
10
10
94
Max.
175
2.0
-
-
30
-
32
100
-
-
-
-
-
-
-
-
-
-
-
-
-
Typ.
150
1.4
-
-
15
40
20
5
-
10
5
94
50
141
120
26
150
12
-
20
106
Units
V
mA
mA
mA
mV
V/C
V/V
pA
nA
pF
dB
V
RMS
V
mA
KHz
S
nF
V/S
dB
MSK162B/E163B/E
MSK162/163
2
Parameter
Max.
175
2.0
3.0
2.1
30
65
32
50
50
-
-
-
-
-
-
-
-
-
-
-
-
4
Test Conditions
ELECTRICAL SPECIFICATIONS
4
4
1
4
4
3 4
NOTES:
4
2
9
4
11
11
4
Quiescent Current
4
4
V
IN
=0V
V
IN
=0V
V
IN
=0V
V
IN
=0V
V
CM
=0V
(DC)
V
CM
=90VDC
1Hz
f
10Hz
I
OUT
=40mA Peak
V
OUT
=MAX
V
OUT
=280V
PP
No Load,R
CL
=0
10V Step
A
V
=+1V/V
C
C
=Open
F=15Hz R
L
=5K
Rev. C 6/02
2
4
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 volt-
age swing will occur. The following formula approximates out-
put voltage swing reduction:
When the device is in current limit, there will be spurious oscil-
lations present on the negative half cycle. The frequency of
the oscillation is application dependent and can not be pre-
dicted. Oscillation will cease when the device comes out of
current limit.
APPLICATION NOTES
CURRENT LIMIT
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational ampli-
fier has two distinct limitations:
1. The current handling capability of the die metallization.
2. The 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 used.
The MSK 162/163 are internally compensated for closed loop
gains of 10 V/V or greater. The majority of applications the
MSK 162/163 are used in involve gains greater than 10 V/V
because the output is capable of swinging up to +/- 141V and
the maximum differential input voltage is only +/- 16V. A
large gain is necessary to make full use of the output voltage
swing capability of the amplifier when input voltages are small.
If closed loop gains of less than 10 V/V are required, refer to
the MSK 158/159 data sheets. The MSK 158/159 operational
amplifiers are identical to the MSK 162/163 except pins two
and six are compensation pins. The user can tailor op-amp
performance with the external connection of a series resistor-
capacitor snubber network. 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 gen-
erally be stable.
STABILITY
*
Vr= Io Rcl
INPUT PROTECTION
Input protection curcuitry within the MSK 162/163 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 recom-
mended.
OUTPUT SNUBBER NETWORK
A 100 ohm resistor and a 330pF capacitor connected in se-
ries 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 net-
work 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 and the load. A
small tradeoff with bandwidth must be made in this configura-
tion. The graph below illustrates the effect of capacitive load.
Note that the compensation capacitor must have a voltage rat-
ing greater than the total rail to rail power supply voltage.
Rev. C 6/02
3
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