DESCRIPTION:
4707 Dey Road Liverpool, N.Y. 13088
(315) 701-6751
MIL-PRF-38534 QUALIFIED
165
ISO-9001 CERTIFIED BY DSCC
EQUIVALENT SCHEMATIC
M.S.KENNEDY CORP.
FEATURES:
Internally Compensated For Gains > 10 V/V
Monolithic MOS Technology
High Voltage Operation : 350V
Low Quiescent Current : 4mA Total
High Output Current : 60mA Min. Per Channel
No Second Breakdown
High Speed : 40V/S Typ.
Space Efficient Dual Amplifier
ULTRA HIGH VOLTAGE DUAL
OPERATIONAL AMPLIFIER
PIN-OUT INFORMATION
TYPICAL APPLICATIONS
1
2
3
4
5
6
7
-Vcc 1
+Vcc 1
Output Drive 1
Current Sense 1
N/C
Inverting Input 2
Non -Inverting Input 2
14
13
12
11
10
9
8
Non-Inverting Input 1
Inverting Input 1
N/C
Current Sense 2
Output Drive 2
+Vcc 2
-Vcc 2
High Voltage Piezo Electric Positioning
Electrostatic Deflection
Computer to Vacuum Tube Interface
Ultra High Voltage
Dual Op-Amp Applications
Bridge Amplifier
The MSK 165 is an ultra high voltage dual 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
output current available from each amplifier, the MSK 165 is also an excellent low cost choice for high voltage piezo
drive circuits. The MOSFET output frees the MSK 165 from secondary breakdown limitations and power dissipation
is kept to a minimum with a quiescent current rating of only 4mA total. The MSK 165 is internally compensated for
gains of 10 V/V or greater and is packaged in a hermetically sealed 14 pin power dip with heat sink bolt down tabs.
MSK165
Rev. A 8/00
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
350V
60mA
120mA
16V
Vcc
150C
Storage Temperature
Lead Temperature
Case Operating Temperature
(MSK165B)
(MSK165)
Thermal Resistance (DC Each Amplifier)
Junction to Case
Total Supply Voltage
Output Current (within S.O.A.)
Output Current Peak
Input Voltage (Differential)
Input Voltage (Common Mode)
Junction Temperature
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, V
CC
= 150VDC and specifications apply to each amplifier.
Derate maximum supply voltage 0.5V/C below T
C
=+25C. No derating is needed above T
C
=25C.
A
V
=-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 T
C
=+25C
Subgroup 2,5 T
C
=+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
1,3
2
-
-
-
-
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
-
40
106
Min.
50
-
-
-
-
-
-
-
-
-
-
84
-
138
60
-
-
-
10
20
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
MSK165B
MSK165
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
4
11
11
4
4
4
-65C to +150C
300C
-55C to +125C
-40C to +85C
12C/W
1Hz
f
10Hz
No Load R
CL
=0
F=15Hz R
L
=5K
Quiescent Current
VIN=0V
VIN=0V
VIN=0V
VIN=0V
VCM=0V
(DC)
VCM=90VDC
IOUT=40mA Peak
VOUT=MAX
VOUT=280VPP
10V Step
AV=+1V/V
Rev. A 8/00
2
APPLICATION NOTES
CURRENT LIMIT
Current limit resistor value can be calculated as follows:
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 dependant and can not be pre-
dicted. Oscillation will cease when the device comes out of
current limit. If current limit is not required simply short pin 3
to pin 4 and pin 10 to pin 11.
R
CL
=3/I
LIM
V
R
=I
O
R
CL
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 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.
*
INPUT PROTECTION
Input protection circuitry within the MSK 165 will clip differ-
ential 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 be-
come 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 (the junction of
R
CL
and pin 4 or 11) and the load. A small tradeoff with band-
width must be made in this configuration. The graph below
illustrates the effect of capacitive load on open loop gain.
The MSK 165 has sufficient phase margin when compen-
sated for unity gain to be stable with capacitive loads of at
least 10nF at gains of 2V/V or greater. However, it is recom-
mended 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. An ef-
fective 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 typically be stable.
STABILITY
Rev. A 8/00
3
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