TS68040MR25A Atmel Corporation, TS68040MR25A Datasheet - Page 16

• Manufacturer Part Number: TS68040MR25A
• Manufacturer: Atmel Corporation

Table 9. Thermal Parameters With Heat Sink and No Air Flow
Thermal Characteristics with
a Heat Sink
and Forced Air
Table 10. Thermal Parameters with Heat Sink and Air Flow
Thermal Testing Summary
16
Thermal Mgmt.
Thermal Mgmt. Technique
1000 LFM
1000 LFM
100 LFM
250 LFM
500 LFM
750 LFM
100 LFM
250 LFM
500 LFM
750 LFM
Technique
Air-flow
Heat Sink
2338B
2338B
TS68040
Heat sink
2338B
2338B
2338B
2338B
2338B
2338B
2338B
2338B
2338B
2338B
3W
5W
P
D
Defined Parameters
A sample size of three TS68040 packages was tested in forced-air cooling in a wind tun-
nel with a heat sink. This test was performed with 3W of power being dissipated from
within the package. As mentioned previously, the variance in
power range is negligible; it can be assumed for calculation purposes that
all power levels. Table 10 shows the results, assuming a maximum power dissipation at
3 and 5W with air flow and heat sink thermal management (refer to Table 6 to calculate
other power dissipation values).
Testing proved that a heat sink in combination with a relatively small amount of air-flow
(100 LFM or less) will easily realize a 0-70°C ambient operating temperature for the
TS68040 with almost any configuration of the output buffers. A heat sink alone may be
capable of providing all necessary cooling, depending on the particular heat sink
height/size restraints, the maximum ambient operating temperature required, and the
output buffer configuration chosen. Also forced air cooling alone may attain a 0-70°C
ambient operating temperature. However this factor is highly dependent on the output
buffer configuration chosen and the available forced air for cooling. Figure 7 is a sum-
mary of the test results of the relationship between
3W
3W
3W
3W
3W
5W
5W
5W
5W
5W
P
125°C
125°C
D
T
J
Defined Parameters
125°C
125°C
125°C
125°C
125°C
125°C
125°C
125°C
125°C
125°C
T
J
1°C/W
1°C/W
JC
1°C/W
1°C/W
1°C/W
1°C/W
1°C/W
1°C/W
1°C/W
1°C/W
1°C/W
1°C/W
JC
Measured
14°C/W
14°C/W
JA
Measured
3.1°C/W
2.2°C/W
1.7°C/W
1.5°C/W
1.4°C/W
3.1°C/W
2.2°C/W
1.7°C/W
1.5°C/W
1.4°C/W
JA
13°C/W
13°C/W
CA
2.1°C/W
1.2°C/W
0.7°C/W
0.5°C/W
0.4°C/W
2.1°C/W
1.2°C/W
0.7°C/W
0.5°C/W
0.4°C/W
JA
CA
and air-flow for the TS68040.
Calculated
122°C
120°C
Calculated
T
C
122°C
122°C
122°C
122°C
122°C
120°C
120°C
120°C
120°C
120°C
JA
T
within the possible
C
2116A–HIREL–09/02
JA
115.7°C
118.4°C
119.9°C
120.5°C
120.8°C
109.5°C
116.5°C
117.5°C
83°C
55°C
is valid at
118°C
114°C
T
T
A
A