4707 Dey Road Liverpool, N.Y. 13088
M.S.KENNEDY CORP.
(315) 701-6751
FEATURES:
158/159
ISO-9001 CERTIFIED BY DSCC
ULTRA HIGH VOLTAGE
Monolithic MOS Technology
Low Cost
High Voltage Operation - 350V
Low Quiescent Current - 2mA Max.
High Output Current - 60mA Min.
No Secondary Breakdown
High Speed - 40V/S Typ.
MIL-PRF-38534 QUALIFIED
DESCRIPTION:
The MSK 158 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 158 is also an excellent low cost choice for high voltage piezo drive circuits. The MOSFET output frees
the MSK 158 from secondary breakdown limitations and power dissipation is kept to a minimum with a quiescent current
rating of only 2mA. The MSK 158 is packaged in a hermetically sealed 8 pin power dip which has two external compensa-
tion pins. For applications requiring heat sinking, the MSK 159 is available with bolt down tabs and is otherwise identical to
the MSK 158 (see mechanical specifications).
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
TYPICAL APPLICATIONS
PIN-OUT INFORMATION
Piezo Electric Positioning
Electrostatic Deflection
Computer to Vacuum Tube Interface
Ultra High Voltage Op-Amp Applications
-Vcc
Comp 1
Output Drive
Current Sense
1
2
3
4
Inverting Input
Non-Inverting Input
Comp 2
+Vcc
7
8
9
10
Rev. C 5/02
1
EQUIVALENT SCHEMATIC
OPERATIONAL AMPLIFIER
MSK158
MSK159
STATIC
Supply Voltage Range
Quiescent Current
INPUT
Offset Voltage
Offset Voltage Drift
Offset Voltage vs V
CC
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
Total Supply Voltage
Output Current (within S.O.A.)
Output Current Peak
Input Voltage (Differential)
Input Voltage (Common Mode)
Junction Temperature
Storage Temperature -65C to +150C
Lead Temperature
300C
Case Operating Temperature
(MSK 158B/E/159B/E) -55C to +125C
(MSK158/159) -40C to +85C
Thermal Resistance (DC)
Junction to Case 10C/W
Group A
Subgroup
-
1
2
3
1
2,3
1
1
2,3
-
-
-
-
4
4
-
-
-
-
4
4
V
mA
mA
mA
mV
V/C
V/V
pA
nA
pF
dB
V
RMS
V
mA
KH
Z
S
nF
V/S
dB
V
IN
=0V
V
IN
=0v
V
IN
=0V
V
IN
=0V
V
CM
=0V
(DC)
V
CM
=90VDC
1H
Z
f
10H
Z
I
OUT
=40mA Peak
V
OUT
=MAX
C
C
=10pF V
OUT
=280V
PP
No Load, R
CL
=0
C
C
=10pF 10V Step
A
V
=+1V/V
C
C
=Open
F=15H
Z
R
L
=5K
350V
60mA
120mA
16V
V
CC
150C
V
CC
I
OUT
I
OUTP
V
IND
V
IN
T
J
Parameter
T
ST
T
LD
T
C
R
TH
ELECTRICAL SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Test Conditions
MSK 158B/E/159B/E
Min.
50
-
-
-
-
-
-
-
-
-
-
84
-
138
60
-
-
-
10
20
94
Typ.
150
1.4
2.0
1.0
15
40
20
5
-
10
5
94
50
141
120
26
150
12
-
40
106
Max.
175
2.0
3.0
2.1
30
65
32
50
50
-
-
-
-
-
-
-
-
-
-
-
-
Typ.
150
1.4
-
-
15
-
20
5
-
10
5
94
50
141
120
26
150
12
-
40
106
MSK 158/159
Min.
50
-
-
-
-
-
-
-
-
-
-
84
-
138
60
-
-
-
10
20
94
Max.
175
2.0
-
-
30
-
32
100
-
-
-
-
-
-
-
-
-
-
-
-
-
Units
Rev. C 5/02
2
4
2
4 9
NOTES:
Unless otherwise noted C
C
=18pF, R
C
=2.2K
, V
CC
=150VDC.
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.
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 specified.
Military grade devices ("B" suffix) shall be 100% tested to subgroups 1,2,3 and 4.
Subgroups 5 and 6 testing available upon request.
Subgroup 1,4
Subgroup 2,5
Subgroup 3,6
Electrical specifications are derated for power supply voltages less than 50VDC.
T
A
=T
C
=+25C
T
A
=T
C
=+125C
T
A
=T
C
=-55C
1
5
7
8
9
3
4
2
6
4
4
4
4
4
4
4
4
4
4
3
11
11
APPLICATION NOTES
CURRENT LIMIT
Current limit resistor value can be calculated as follows:
R
CL
=3/I
LIM
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 minimum 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 perfor-
mance 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:
V
R
=I
O
*
R
CL
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 predicted. Oscil-
lation will cease when the device comes out of current limit. If
current limit is not required simply short pin 3 and pin 4.
INPUT PROTECTION
Input protection circuitry within the MSK 158/159 will clip dif-
ferential 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 resis-
tors in series with each input. These resistors may become dam-
aged 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 appli-
cations where load capacitance is less than 330pF. For larger val-
ues of load capacitance, the output snubber network may be omit-
ted. 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) 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 compensation capacitor must have a voltage
rating greater than or equal to the total rail to rail power supply
voltage.
Rev. C 5/02
3
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, ex-
ternal fast-recovery reverse biased diodes should be connected from
the output to ground.
STABILITY
The MSK 158/159 has sufficient phase margin when compen-
sated 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 158/
159 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 qual-
ity 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 be stable.
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