MSK0041RH M. S Kennedy, MSK0041RH Datasheet - Page 3

• Manufacturer Part Number: MSK0041RH
• Description: High Power Op-amp Rad Hard Medium Power Op-amp
• Manufacturer: M. S Kennedy

Governing Equation:
T
Where
Example:
a 10 volt peak sine wave across a 100 ohm load for 0.1 amp of
output current. For a worst case analysis we will treat the 0.1 amp
peak output current as a D.C. output current. The power supplies
are ±15 VDC.
1.) Find Power Dissipation
2.) For conservative design, set T
3.) For this example, worst case T
4.) R
5.) Rearrange governing equation to solve for R
more than 148°C/W to maintain a junction temperature of less than
+150°C. This calculation assumes a case to sink thermal resistance
of 0.15°C/W.
HEAT SINKING
thermal model and governing equation below.
Thermal Model:
J
APPLICATION NOTES
The heat sink in this example must have a thermal resistance of no
In our example the amplifier application requires the output to drive
To select the correct heat sink for your application, refer to the
= P
T
P
R
R
R
T
T
T
P
R
D
D
J
C
S
A
=(3.5 mA) X (30V) + (5V) X (0.1A)
=0.1W + 0.5W
=0.6W
JC
CS
=[(quiescent current) X (+V
JC
SA
SA
D
x (R
= 85°C/W
= (T
= (150°C - 25°C) / 0.6W - (60°C/W) - (0.15°C/W)
= 148°C/W
= Junction Temperature
= Total Power Dissipation
= Junction to Case Thermal Resistance
= Case to Heat Sink Thermal Resistance
= Heat Sink to Ambient Thermal Resistance
= Case Temperature
= Ambient Temperature
= Sink Temperature
JC
J
- T
+ R
A
) / P
CS
D
+ R
- (R
SA
JC
) + T
CC
) - (R
J
A
- (V
= +150°C.
= +25°C.
A
CC
CS
))] + [(V
)
S
SA:
- V
O
) X I
OUT
]
3
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CURRENT LIMIT
designed to limit the output drivers anytime output current
exceeds a predetermined limit. The following formula may
be used to determine the value of the current limit resistance
necessary to establish the desired current limit.
Current Limit Connection
TOTAL DOSE RADIATION TEST
PERFORMANCE
information on current limit connections.
POWER SUPPLY BYPASSING
be effectively decoupled with a high and low frequency by-
pass circuit to avoid power supply induced oscillation. An
effective decoupling scheme consists of a 0.1 microfarad
ceramic capacitor in parallel with a 4.7 microfarad tantalum
capacitor from each power supply pin to ground.This ca-
pacitor will eliminate any peak output voltage clipping which
may occur due to poor power supply load regulation. All
power supply decoupling capacitors should be placed as
close to the package power supply pins as possible.
SAFE OPERATING AREA
of the power handling capability of the amplifier under vari-
ous conditions. The wire bond current carrying capability,
transistor junction temperature and secondary breakdown
limitations are all incorporated into the safe operating area
curves. All applications should be checked against the curves
to ensure high M.T.B.F.
generated for all radiation testing performed by MS Kennedy.
These curves show performance trends throughout the TID
test process and can be located in the MSK 0041RH radia-
tion test report. The complete radiation test report will be
available in the RAD HARD PRODUCTS section on the MSK
website.
The MSK 0041RH has an on-board current limit scheme
Radiation performance curves for TID testing have been
See "Application Circuits" in this data sheet for additional
Both the negative and the positive power supplies must
The safe operating area curve is a graphical representation
R
SC
=
___
0.7
I
SC
Rev. B 6/08