ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
FEATURES:
ULTRA HIGH VOLTAGE DUAL
OPERATIONAL AMPLIFIER
103
(315) 701-6751
4707 Dey Road Liverpool, N.Y. 13088
MIL-PRF-38534 QUALIFIED
Low Cost Dual Amplifier
Monolithic MOS Technology
High Voltage Operation : 350V
Low Quiescent Current : 2mA Max Per Amplifier
High Output Current: 60mA Minimum Per Amplifier
No Second Breakdown
High Speed : 40V/µS Typ
MSK103
The MSK 103 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 available from each amplifier, the MSK 103 is also an excellent low cost choice for high
voltage piezo drive circuits. The MOSFET output frees the MSK 103 from secondary breakdown limitations and
power dissipation is kept to a minimum with a quiescent current rating of only 2mA per amplifier. The MSK 103 is
packaged in a hermetically sealed 18 pin ceramic dip which has external compensation pins for each amplifier.
DESCRIPTION:
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
Piezo Electric Positioning
Electrostatic Deflection
Computer to Vacuum Tube Interface
Ultra High Voltage
Dual Op-Amp Applications
600 Volt, 0.12 Amp Bridge Amplifier
PIN-OUT INFORMATION
1
2
3
4
5
6
7
8
9
1
Inverting Input 1
Non Inverting Input 1
-Vcc 1
Output Drive 1
+Vcc 2
N/C
Comp 1-2 (U2)
Comp 2-2 (U2)
Current Sense 2
18
17
16
15
14
13
12
11
10
Current Sense 1
Comp 2-1 (U1)
Comp 1-1 (U1)
N/C
+Vcc 1
Output Drive 2
-Vcc 2
Non Inverting Input 2
Inverting Input 2
Rev. B 1/02
ABSOLUTE MAXIMUM RATINGS
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R
TH
ELECTRICAL SPECIFICATIONS
Parameter
STATIC
Supply Voltage Range
2
4
9
Test Conditions
1
Group A
Subgroup
-
1
Min.
±50
-
-
-
-
-
-
-
-
-
-
84
-
MSK103B
Typ.
Max.
Min.
MSK103
Typ.
±150
±1.4
-
-
±15
±40
±20
±5
-
10
5
94
50
11
Max.
±175
±2.0
-
-
±30
-
±32
±100
-
-
-
-
-
-
-
-
-
-
-
-
-
±150 ±175 ±50
±1.4
±2.0
±1.0
±15
±40
±20
±5
-
10
11
5
94
50
±2.0
±3.0
±2.1
±30
±65
±32
±50
±50
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
84
-
Quiescent Current
INPUT
Offset Voltage
Offset Voltage Drift
Input Bias Current
Input Impedance
4
Input Capacitance
Noise
OUTPUT
Output Voltage Swing
Output Current
Power Bandwidth
Resistance
4
3 4
4
4
4
4
4
V
IN
=0V
2
3
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
C
C
=10pF V
OUT
=280V
PP
No Load R
CL
=0Ω
C
C
=10pF 10V Step
A
V
=+1V/V
C
C
=Open
4
1
2,3
1
1,3
2
-
-
-
-
4
4
-
-
-
-
4
4
Offset Voltage vs ±Vcc
4
Common Mode Rejection
±138 ±141
±60
-
-
-
10
20
94
±120
26
150
12
-
40
106
±138 ±141
±60
-
-
-
10
20
94
±120
26
150
12
-
40
106
Settling Time to 0.1%
Capacitive Load
Slew Rate
Open Loop Voltage Gain
4
TRANSFER CHARACTERISTICS
V/µS
dB
F=15Hz R
L
=5KΩ
NOTES:
1
2
3
4
5
6
7
8
Unless otherwise noted C
C
=18pF, R
C
=2.2KΩ, ±V
CC
= ±150VDC and specifications apply to each amplifier.
Derate maximum supply voltage 0.5V/°C below T
C
=+25°C. No derating is needed above T
C
=25°C.
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
=+25°C
Subgroup 2,5 T
C
=+125°C
Subgroup 3,6 T
A
=-55°C
9 Electrical specifications are derated for power supply voltages less than ±50VDC.
2
Rev. B 1/02
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V
CC
2
±I
OUT
±I
OUTP
V
IND
V
IN
T
J
Total Supply Voltage
Output Current (within S.O.A.)
Output Current Peak
Input Voltage (Differential)
Input Voltage (Common Mode)
Junction Temperature
350V
60mA
120mA
±16V
±Vcc
150°C
T
ST
T
LD
T
C
Storage Temperature
-65°C to +150°C
Lead Temperature
300°C
Case Operating Temperature
(MSK103B)
-55°C to +125°C
(MSK103)
-40°C to +85°C
Thermal Resistance (DC Each Amp)
Junction to Case
11°C/W
Units
V
mA
mA
mA
mV
µV/°C
µV/V
pA
nA
Ω
pF
dB
µV
RMS
V
mA
KHz
Ω
µS
nF
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 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:
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 pre-
dicted. Oscillation will cease when the device comes out of
current limit. If current limit is not required simply short pin 4
to pin 18 and pin 9 to pin 13.
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 103 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 drive pin of the amplifier and the
load. A small tradeoff with bandwidth must be made in this
configuration. The graph below illustrates the effect of capaci-
tive load on open loop gain.
STABILITY
The MSK 103 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 re-
sistor and input capacitance. The user can tailor the perfor-
mance of the MSK 103 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 demon-
strate the effect of various forms of compensation. The com-
pensation capacitor must be rated at 350 volts working voltage
if maximum power supply voltages are used. The compensa-
tion 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 capaci-
tor.
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 typically be stable.
3
Rev. B 1/02
TYPICAL PERFORMANCE CURVES
4
Rev. B 1/02
MECHANICAL SPECIFICATIONS
MSK103
ESD TRIANGLE INDICATES PIN 1.
ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.
ORDERING INFORMATION
Part
Number
MSK103
MSK103B
Screening Level
Industrial
Military-Mil-PRF-38534
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.
M.S. Kennedy Corp.
5
Rev. B 1/02
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