Output 1
-Vcc 1/2
+Vcc 1/2
Output 2
Output 3
-Vcc 3/4
+Vcc 3/4
Output 4
N/C
PIN-OUT INFORMATION
TYPICAL APPLICATIONS
4707 Dey Road Liverpool, N.Y. 13088
(315) 701-6751
FEATURES:
MIL-PRF-38534 CERTIFIED
105
ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
Low Cost
Wide Supply Voltage Range: 5V to 40V
High Output Current: 3A Minimum
High Efficiency:
Vs-2.2V
at 2.5A
Internal Current Limit
Wide Common Mode Range
(Includes Negative Supply Voltage)
Low Distortion
Internal Output Snubbers for Ultra-Stable Operation
HIGH POWER QUAD
OPERATIONAL AMPLIFIER
EQUIVALENT SCHEMATIC
1
2
3
4
5
6
7
8
9
-Input 1
+Input 1
+Input 2
-Input 2
N/C
-Input 3
+Input 3
+Input 4
-Input 4
18
17
16
15
14
13
12
11
10
Half and Full Bridge Motor Drives
Audio Power Amplifiers
Bridge - 60W RMS Per Pair
Stereo - 30W RMS Per Channel
Ideal for Single Supply Systems
5V - Peripheral
12V - Automotive
28V - Avionic
DESCRIPTION:
The MSK 105 is a high power quad operational amplifier. Each amplifier is capable of delivering three amps of
current to the load. The MSK 105 is an excellent low cost alternative for bridge mode configurations since all
amplifiers are packaged together and will track thermally. The wide common mode range includes the negative rail,
facilitating single supply applications. It is possible to have a "ground based" input driving a single supply amplifier
with ground acting as the second or "bottom" supply of the amplifier. To maintain stability, output snubber networks
have been internally connected to each op amp output (see "amplifier stability" in the attached application notes).
The output stage is also current limit protected to approximately 3.0 amps. The MSK 105 is packaged in a space
efficient 18-pin ceramic dip. Consult factory for other packaging options if desired.
1
Rev. D 10/01
Storage Temperature
Lead Temperature
Case Operating Temperature
(MSK105B/E)
(MSK105)
Thermal Resistance (DC)
Junction to Case
(Per Amplifier)
(Per Die)
Input Bias Current
STATIC
Supply Voltage Range
INPUT
Offset Voltage
Offset Voltage Drift
Power Supply Rejection
Common Mode Rejection
Total Noise
OUTPUT
Output Voltage Swing
Output Current
Current Limit
Power Bandwidth
Crosstalk
Capacitive Load
TRANSFER CHARACTERISTICS
Slew Rate
Open Loop Voltage Gain
Total Supply Voltage
Output Current (within S.O.A.)
Input Voltage (Differential)
Input Voltage
(Common Mode)
Junction Temperature
-65C to +150C
300C
-55C to +125C
-40C to +85C
8.0C/W
5.0C/W
40V
4A
V
CC
+V
CC
, -V
CC
-0.5V
150C
ABSOLUTE MAXIMUM RATINGS
T
ST
T
LD
T
C
R
TH
V
CC
I
OUT
V
IND
V
IN
T
J
Unless otherwise noted VCC=15VDC. Specification is for each of the four amplifiers unless otherwise noted.
Devices shall be capable of meeting the parameter, but need not be tested. Typical parameters are for reference only.
Industrial grade and 'E' suffix 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 TC=+25C
Subgroup 2,5 TC=+125C
Subgroup 3,6 TA=-55C
Power Dissipation must be equal in both amplifiers of one dual die for this rating to apply.
Group A
Subgroup
-
1
2
3
1
-
-
-
-
-
-
4
4
-
-
-
-
4
-
Typ.
15
60
120
40
0.5
15
35
75
80
85
0.1
14.2
4.0
4.0
13.6
68
0.022
1.5
100
Min.
2.5
-
-
-
-
-
-
-
60
60
-
14
3.0
-
-
60
-
0.5
80
Min.
2.5
-
-
-
-
-
-
-
60
60
-
14
3.0
-
-
-
-
0.5
80
Max.
20
150
-
-
15
-
1500
-
-
-
1.0
-
-
-
-
-
-
-
-
Typ.
15
60
-
-
2
15
35
75
80
85
0.1
14.2
4.0
4.0
13.6
68
0.022
1.5
100
Units
V
mA
mA
mA
mV
V/C
nA
nA
dB
dB
mV
V
A
A
KHz
dB
F
V/S
dB
MSK105B/E
MSK105
2
Parameter
Max.
20
150
210
150
12
-
1000
1000
-
-
1.0
-
-
-
-
-
-
-
-
Test Conditions
ELECTRICAL SPECIFICATIONS
1
2
NOTES:
Quiescent Current
2
2
2
2
2
2
2
(Split Supply)
Total; V
IN
=0V
V
IN
=0V
V
IN
=0V
V
CM
=0V
Full Temp.
V
CC
=15V
V
CM
=10VDC
R
L
=500
A
V
=1 C
L
=1500pF
(I
OUT
=0.5A)
V
OUT
=MAX
V
OUT
=28V
PP
I
OUT
=1A f=1KHz
A
V
=+1V/V
f=10Hz R
L
=500
Rev. D 10/01
2
3
7
1
2
4
5
6
7
APPLICATION NOTES
SAFE OPERATING AREA (SOA)
AMPLIFIER STABILITY
Since both output transistors in this amplifier are NPN, con-
sideration must be taken when stabilizing the output. A one
ohm resistor, 0.047uF capacitor snubber network has been
added internally from the output to -Vcc on each amplifier. This
configuration minimizes local output stage oscillations. As al-
ways, adequate power supply bypassing is a necessity for
amplifier stability. A parallel combination of a 4.7uF electro-
lytic (for every amp of output current) and a 0.01uF ceramic
disc capacitor should be connected as close as possible to the
package power supply pins to ground. The R-C snubber net-
works shown on the outputs of the amplifiers in the typical
circuits are internal and should not be added externally.
If the inductive load is driven near steady state conditions al-
lowing the output to drop more than 6V below the supply rail
while the amplifier is current limiting, the inductor should be
capacitively coupled or the supply voltage must be lowered to
meet the SOA criteria. It is a good practice to also connect
reverse biased fast recovery diodes to the output for protection
against sustained high energy flyback.
BIDIRECTIONAL MOTOR DRIVE
PARALLEL CONNECTION
yields single 6A amplifier
Vcc
20V
15V
10V
5V
Inductive Load
7.5mH
25mH
35mH
150mH
Capacitive Load
200uF
500uF
5mF
50mF
Safe operating area curves are a graphical representation of
all of the power limiting factors involved in the output stage of
an operational amplifier. Three major power limiting factors
are; output transistor wire bond carrying capability, output tran-
sistor junction temperature and secondary breakdown effects.
To see if your application is meeting or exceeding the limita-
tions of the safe operating area curves, perform the following
steps:
1.) Find the worst case output power dissipation. For a split
supply, purely resistive load application, this occurs when
V
OUT
=1/2 V
CC
.
2.) Take the values of (V
CC
-V
OUT
) and the corresponding out-
put current and find their intersection on the safe operating
area curves.
3.) Verify this point is below the safe operating area curves.
This is a simple task for purely resistive loads, for reactive loads
the following table will save extensive analysis. Under tran-
sient conditions, capacitive and inductive loads up to the fol-
lowing maximum are safe.
Rev. D 10/01
3
APPLICATION NOTES CONTINUED
T
J
=P
D
x (R
JC
+ R
CS
+ R
SA
) + T
A
Where
T
J
= Junction Temperature
P
D
= Total Power Dissipation
R
JC
= Junction to Case Thermal Resistance
R
CS
= Case to Heat Sink Thermal Resistance
R
SA
= Heat Sink to Ambient Thermal Resistance
T
C
= Case Temperature
T
A
= Ambient Temperature
T
S
= Sink Temperature
Governing Equation:
Thermal Path:
HEAT SINKING
To determine if a heat sink is necessary for your appli-
cation and if so, what type, refer to the thermal model
and governing equation below.
Thermal
Model:
Example:
Inside the MSK 105 package are two monolithic dual amplifi-
ers that do not exhibit thermal crossover (die to die) at 45
spreading angle. Therefore, our example will focus on only one
of the two die. Further, consideration must be taken to calcu-
late power dissipation on each amplifier of the die to determine
worst case power dissipation. Only the worst case amplifier
will be used in this example. In our example, the amplifer is
required to drive 10 volts across a 20 ohm load. This calcu-
lates to 0.5 amps of output current. The power supplies are
20 Vdc.
1.) To Find Power Dissipation
P
D
= [(quiescent current) x (+V
CC
- (-V
CC
))] + (V
CC
- V
O
) x I
OUT
P
D
= 37.5 mA* x 40V + 10V x 0.5A
P
D
= 1.5W + 5W
P
D
= 6.5W
*
quiescent current for one amplifier is 1/4 of entire quiescent current.
Tj shall be 150C R
jc = 8.0C/W
Ta shall be 25C R
cs = 0.15C/W (
most thermal greases
)
2.) Rearrange the governing equation to solve for R
SA
(
heat sink to air
)
R
sa = ((Tj - TA)/PD) - R
jc - R
cs
= ((150C - 25C)/6.5W) - 8.0C/W - 0.15C/W
= 11.08C/W
Therefore, to maintain a junction temperature of no more than
150C for that amplifier, the heat sink must have a thermal
resistance of no more than 11.1C/W.
Rev. D 10/01
4
TYPICAL PERFORMANCE CURVES
Rev. D 10/01
5
MECHANICAL SPECIFICATIONS
ESD TRIANGLE INDICATES PIN 1.
ALL DIMENSIONS ARE 0.010 INCHES UNLESS OTHERWISE LABELED.
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.
M.S. Kennedy Corp.
4707 Dey Road, Liverpool, New York 13088
Phone (315) 701-6751
FAX (315) 701-6752
www.mskennedy.com
MSK105
Screening Level
Part
Number
MSK105
MSK105E
MSK 105B
Industrial
Extended Reliability
Class H-Mil-PRF-38534
ORDERING INFORMATION
Rev. D 10/01
6
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