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/µS Typ.
MIL-PRF-38534 CERTIFIED
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
8
7
6
5
Rev. D 6/05
1
EQUIVALENT SCHEMATIC
OPERATIONAL AMPLIFIER
MSK158 MSK159
STATIC
Supply Voltage Range
Quiescent Current
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
Total Supply Voltage
Output Current (within S.O.A.)
Output Current Peak
Input Voltage (Differential)
Input Voltage (Common Mode)
Junction Temperature
Storage Temperature -65°C to +150°C
Lead Temperature 300°C
Case Operating Temperature
(MSK 158B/E/159B/E) -55°C to +125°C
(MSK158/159) -40°C to +85°C
Thermal Resistance (DC)
Junction to Case 10°C/W
Group A
Subgroup
-
1
2
3
1
2,3
1
1
2,3
-
-
-
-
4
4
-
-
-
-
4
4
V
mA
mA
mA
mV
µV/°C
µV/V
pA
nA
Ω
pF
dB
µVRMS
V
mA
KHZ
Ω
µS
nF
V/µS
dB
VIN=0V
VIN=0v
VIN=0V
VIN=0V
VCM=0V
(DC)
VCM=±90VDC
1HZ≤f≤10HZ
IOUT=±40mA Peak
VOUT=MAX
CC=10pF VOUT=280VPP
No Load, RCL=0Ω
CC=10pF 10V Step
AV=+1V/V
CC=Open
F=15HZ RL=5KΩ
350V
60mA
120mA
±16V
±VCC
150°C
VCC
±IOUT
±IOUTP
VIND
VIN
TJ
Parameter
TST
TLD
TC
RTH
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. D 6/05
2
○○○○○○○○○○○○
4
2
○○○ ○○○○○○○
○○○○○○○○○○○○○○○
○○○○○○
○○○○○○○○○○○○○○
○○○○○○○○○○○
○○○○○○○
○○○○○○○○○ ○○ ○○○○
49
NOTES:
Unless otherwise noted CC=18pF, RC=2.2KΩ, ±VCC=±150VDC.
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.
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.
TA=TC=+25°C
TA=TC=+125°C
TA=TC=-55°C
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:
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 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:
VR=IO * RCL
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 the negative rail 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 4) and the
load. A small tradeoff with bandwidth must be made in this configu-
ration. 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. D 6/053
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.
TYPICAL PERFORMANCE CURVES
Rev. D 6/05
4
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.
Please visit our website for the most recent revision of this datasheet.
MECHANICAL SPECIFICATIONS
M.S. Kennedy Corp.
4707 Dey Road, Liverpool, New York 13088
Phone (315) 701-6751
FAX (315) 701-6752
www.mskennedy.com
Rev. D 6/05
5
MSK158 MSK159
ESD TRIANGLE INDICATES PIN 1.
NOTE: ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.
ORDERING INFORMATION
Screening Level
Part
Number
MSK158
MSK158E
MSK158B
MSK159
MSK159E
MSK159B
Industrial
Extended Reliability
Mil-PRF-38534 Class H
Industrial
Extended Reliability
Mil-PRF-38534 Class H
