參數(shù)資料
型號(hào)： TS68040DESC01XAA
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, CPGA179
封裝： CERAMIC, PGA-179
文件頁(yè)數(shù)： 13/49頁(yè)
文件大小： 1637K
代理商： TS68040DESC01XAA
13
TS68040
2116A–HIREL–09/02
Thermal Characteristics in
Still Air
A sample size of three TS68040 packages was tested in free-air cooling with no heat
sink. Measurements showed that the average
Φ
JA
was 22.8°C/W with a standard devia-
tion of 0.44°C/W. The test was performed with 3W of power being dissipated from within
the package. The test determined that
Φ
JA
will decrease slightly for the increasing power
dissipation range possible. Therefore, since the variance in
Φ
JA
within the possible
power dissipation range is negligible, it can be assumed for calculation purposes that
Φ
JA
is valid at all power levels. Using the formulas introduced previously, Table 7 shows
the results of a maximum power dissipation of 3 and 5W with no heat sink or air-flow
(refer to Table 6 to calculate other power dissipation values).
As seen by looking at the ambient temperature results, most users will want to imple-
ment some type of thermal management to obtain a more reasonable maximum
ambient temperature.
Thermal Characteristics in
Forced Air
A sample size of three TS68040 packages was tested in forced air cooling in a wind tun-
nel with no heat sink. This test was performed with 3W of power being dissipated from
within the package. As previously mentioned, since the variance in
Φ
JA within the possi-
ble power range is negligible, it can be assumed for calculation purposes that
Φ
JA
is
constant at all power levels. Using the previous formulas, Table 8 shows the results of
the maximum power dissipation at 3 and 5W with air-flow and no heat sink (refer to
Table 6 to calculate other power dissipation values).
Table 7.
Thermal Parameters With No Heat Sink or Air-flow
Defined Parameters
Measured
Calculated
P
D
T
J
Φ
JC
Φ
JA
Φ
CA
=
Φ
JA
-
Φ
JC
T
C
= T
J
- P
D
*
Φ
JC
T
A
= T
J
- P
D
*
Φ
JA
3 Watts
125°C
1°C/W
21.8°C/W
20.8°C/W
122°C
59.6°C
5 Watts
125°C
1°C/W
21.8°C/W
20.8°C/W
120°C
16°C
Table 8.
Thermal Parameters With Forced Air Flow and No Heat Sink
Thermal Mgmt.
Technique
Defined Parameters
Measured
Calculated
Air-flow velocity
P
D
T
J
Φ
JC
Φ
JA
Φ
CA
T
C
T
A
100 LFM
3W
125°C
1°C/W
11.7°C/W
10.7°C/W
122°C
89.9°C
250 LFM
3W
125°C
1°C/W
10°C/W
9°C/W
122°C
95°C
500 LFM
3W
125°C
1°C/W
8.9°C/W
7.9°C/W
122°C
98.3°C
750 LFM
3W
125°C
1°C/W
8.5°C/W
7.5°C/W
122°C
99.5°C
1000 LFM
3W
125°C
1°C/W
8.3°C/W
7.3°C/W
122°C
100.1°C
100 LFM
5W
125°C
1°C/W
11.7°C/W
10.7°C/W
120°C
66.5°C
250 LFM
5W
125°C
1°C/W
10°C/W
9°C/W,
120°C
75°C
500 LFM
5W
125°C
1°C/W
8.9°C/W
7.9°C/W
120°C
80.5°C
750 LFM
5W
125°C
1°C/W
8.5°C/W
7.5°C/W
120°C
82.5°C
1000 LFM
5W
125°C
1°C/W
8.3°C/W
7.3°C/W
120°C
83.5°C
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參數(shù)描述
TS68040DESC01XCA 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Third- Generation 32-bit Microprocessor
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TS68040DESC01ZCA 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Third- Generation 32-bit Microprocessor
TS68040DESC02XAA 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Third- Generation 32-bit Microprocessor
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