MC68LC040RC25A Datasheet, PDF (350/442 Pages) Freescale Semiconductor, Inc – M68040 Users Manual

Freescale Semiconductor, Inc.
11.9.4 With Heat Sink and Forced Air
In the specification provided by Thermalloy, Inc., a chart illustrates the air velocity versus
thermal resistance. This chart applies if airflow is used with the heat sink. Table 11-6 lists
the calculations based on this chart.
Table 11-6. Thermal Parameters with Heat Sink and Airflow
MHz
Thermal Mgmt.
Technique
Airflow Velocity
25
25
25
200 LFM
33
33
33
25
25
25
400 LFM
33
33
33
25
25
25
600 LFM
33
33
33
25
25
25
800 LFM
33
33
33
20
25
200 LFM
33
20
25
400 LFM
33
20
25
600 LFM
33
20
25
800 LFM
33
Defined Parameters
Heat-Sink
Spec.
P_D
T_J
θ_JC M AX .
θ_CA
MC68040
6.3 W
6.6 W
8.6 W
7.7 W
8.0 W
10.0W
110 °C
3 °C/W 4.25 °C/W
6.3 W
6.6 W
8.6 W
7.7 W
8.0 W
10.0W
110 °C
3 °C/W 2.30 °C/W
6.3 W
6.6 W
8.6 W
7.7 W
8.0 W
10.0W
110 °C
3 °C/W 1.50 °C/W
6.3 W
6.6 W
8.6 W
7.7 W
8.0 W
10.0W
110 °C
3 °C/W 1.25 °C/W
MC68LC040 and MC68EC040
4.0 W
5.0 W
6.3 W
110 °C
3 °C/W 4.25 °C/W
4.0 W
5.0 W
6.3 W
110 °C
3 °C/W 2.30 °C/W
4.0 W
5.0 W
6.3 W
110 °C
3 °C/W 1.50 °C/W
4.0 W
5.0 W
6.3 W
110 °C
3 °C/W 1.25 °C/W
Calculated
θ_JA
T_C
T_A
7.25 °C/W
5.25 °C/W
4.50 °C/W
4.25 °C/W
91.1 °C
90.2 °C
84.2 °C
86.9 °C
86.0 °C
80.0 °C
91.1 °C
90.2 °C
84.2 °C
86.9 °C
86.0 °C
80.0 °C
91.1 °C
90.2 °C
84.2 °C
86.9 °C
86.0 °C
80.0 °C
91.1 °C
90.2 °C
84.2 °C
86.9 °C
86.0 °C
80.0 °C
64.3 °C
62.2 °C
47.7 °C
54.2 °C
52.0 °C
37.5 °C
76.9 °C
75.4 °C
64.9 °C
69.6 °C
68.0 °C
57.5 °C
81.7 °C
80.3 °C
71.3 °C
75.4 °C
74.0 °C
65.0 °C
83.2 °C
82.0 °C
73.5 °C
77.3 °C
76.0 °C
67.5 °C
7.25 °C/W
5.25 °C/W
4.50 °C/W
4.25 °C/W
98.0 °C
95.0 °C
91.1 °C
98.0 °C
95.0 °C
91.1 °C
98.0 °C
95.0 °C
91.1 °C
98.0 °C
95.0 °C
91.1 °C
81.0 °C
73.8 °C
64.3 °C
89.0 °C
83.8 °C
76.9 °C
92.0°C
87.5 °C
81.7 °C
93.0°C
88.8 °C
83.2 °C
11-22
M68040 USER’S MANUAL
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