參數(shù)資料
型號(hào)： TS68040MF25A
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： Third- Generation 32-bit Microprocessor
中文描述： 32-BIT, 25 MHz, MICROPROCESSOR, CQFP196
封裝： CAVITY UP, CERAMIC, QFP-196
文件頁(yè)數(shù)： 16/49頁(yè)
文件大?。?/td> 1637K
代理商： TS68040MF25A
16
TS68040
2116A–HIREL–09/02
Thermal Characteristics with
a Heat Sink
and Forced Air
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
Φ
JA
within the possible
power range is negligible; it can be assumed for calculation purposes that
Φ
JA
is valid at
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).
Thermal Testing Summary
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
Φ
JA
and air-flow for the TS68040.
Table 9.
Thermal Parameters With Heat Sink and No Air Flow
Thermal Mgmt.
Technique
Defined Parameters
Measured
Calculated
Heat Sink
P
D
T
J
Φ
JC
Φ
JA
Φ
CA
T
C
T
A
2338B
3W
125°C
1°C/W
14°C/W
13°C/W
122°C
83°C
2338B
5W
125°C
1°C/W
14°C/W
13°C/W
120°C
55°C
Table 10.
Thermal Parameters with Heat Sink and Air Flow
Thermal Mgmt. Technique
Defined Parameters
Measured
Calculated
Air-flow
Heat sink
P
D
T
J
Φ
JC
Φ
JA
Φ
CA
T
C
T
A
100 LFM
2338B
3W
125°C
1°C/W
3.1°C/W
2.1°C/W
122°C
115.7°C
250 LFM
2338B
3W
125°C
1°C/W
2.2°C/W
1.2°C/W
122°C
118.4°C
500 LFM
2338B
3W
125°C
1°C/W
1.7°C/W
0.7°C/W
122°C
119.9°C
750 LFM
2338B
3W
125°C
1°C/W
1.5°C/W
0.5°C/W
122°C
120.5°C
1000 LFM
2338B
3W
125°C
1°C/W
1.4°C/W
0.4°C/W
122°C
120.8°C
100 LFM
2338B
5W
125°C
1°C/W
3.1°C/W
2.1°C/W
120°C
109.5°C
250 LFM
2338B
5W
125°C
1°C/W
2.2°C/W
1.2°C/W
120°C
114°C
500 LFM
2338B
5W
125°C
1°C/W
1.7°C/W
0.7°C/W
120°C
116.5°C
750 LFM
2338B
5W
125°C
1°C/W
1.5°C/W
0.5°C/W
120°C
117.5°C
1000 LFM
2338B
5W
125°C
1°C/W
1.4°C/W
0.4°C/W
120°C
118°C
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