MSK0002RH M. S Kennedy, MSK0002RH Datasheet - Page 3

• Manufacturer Part Number: MSK0002RH
• Description: Rad Tolerant, High Speed, Buffer Amplifier
• Manufacturer: M. S Kennedy

Where
HEAT SINKING
Thermal Model:
Governing Equation:
Example:
This example demonstrates a worst case analysis for the buffer
output stage. This occurs when the output voltage is 1/2 the
power supply voltage. Under this condition, maximum power
transfer occurs and the output is under maximum stress.
Conditions:
For a worst case analysis we will treat the ±6Vp sine wave as
an 6 VDC output voltage.
1.) Find Driver Power Dissipation
2.) For conservative design, set T
3.) For this example, worst case T
4.) R
5.) R
6.) Rearrange governing equation to solve for R
and if so, what type, refer to the thermal model and governing
equation below.
VCC= ±12VDC
Vo= ±6Vp Sine Wave, Freq. = 1KHz
RL= 100
T
T
PD=Total Power Dissipation
R
R
T
T
T
To determine if a heat sink is necessary for your application
C
A
S
J=
J
PD= (Vcc-Vo) (Vo/R
=Junction Temperature
=Sink Temperature
=Case Temperature
=Ambient Temperature
JC
CS
P
JC
CS
APPLICATION NOTES
=Junction to Case Thermal Resistance
=Heat Sink to Ambient Thermal Resistance
= 360mW
= (12V-6V) (6V/100 )
D X
= 55° C/W from MSK 0002RH Data Sheet
= 0.15° C/W for most thermal greases
(R
JC
+R
CS +
R
L
)
SA
) +T
A
J
A
=+125°C Max.
=+80°C
SA
3
R
This heat sink in this example must have a thermal resistance
of no more than 69.9°C/W to maintain a junction temperature
of no more than +125°C.
Typical Applications:
TOTAL DOSE RADIATION TEST
PERFORMANCE
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 0002RH radiation test report. The complete
radiation test report is available in the RAD HARD PROD-
UCTS section on the MSK website.
http://www.mskennedy.com/store.asp?pid=9951&catid=19680
Radiation performance curves for TID testing have been
SA
= ((125°C - 80°C) / 0.36W) - 55°C/W - 0.15°C/W
= 125 - 55.15
= 69.9°C/W
= ((T
J
- T
A
)/P
D
) - (R
JC
) - (R
CS
)
Rev. B 8/07