Loading...
11-22 M68040 USER’S MANUAL MOTOROLA
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
Thermal Mgmt.
Technique Defined Parameters Heat-Sink
Spec. Calculated
MHz Airflow Velocity PDTJθJC M AX .θCA θJA TCTA
MC68040
25
25
25
33
33
33
200 LFM
6.3 W
6.6 W
8.6 W
7.7 W
8.0 W
10.0W
110 °C3 °C/W 4.25 °C/W 7.25 °C/W
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
25
25
25
33
33
33
400 LFM
6.3 W
6.6 W
8.6 W
7.7 W
8.0 W
10.0W
110 °C3 °C/W 2.30 °C/W 5.25 °C/W
91.1 °C
90.2 °C
84.2 °C
86.9 °C
86.0 °C
80.0 °C
76.9 °C
75.4 °C
64.9 °C
69.6 °C
68.0 °C
57.5 °C
25
25
25
33
33
33
600 LFM
6.3 W
6.6 W
8.6 W
7.7 W
8.0 W
10.0W
110 °C3 °C/W 1.50 °C/W 4.50 °C/W
91.1 °C
90.2 °C
84.2 °C
86.9 °C
86.0 °C
80.0 °C
81.7 °C
80.3 °C
71.3 °C
75.4 °C
74.0 °C
65.0 °C
25
25
25
33
33
33
800 LFM
6.3 W
6.6 W
8.6 W
7.7 W
8.0 W
10.0W
110 °C3 °C/W 1.25 °C/W 4.25 °C/W
91.1 °C
90.2 °C
84.2 °C
86.9 °C
86.0 °C
80.0 °C
83.2 °C
82.0 °C
73.5 °C
77.3 °C
76.0 °C
67.5 °C
MC68LC040 and MC68EC040
20
25
33
200 LFM
4.0 W
5.0 W
6.3 W
110 °C3 °C/W 4.25 °C/W 7.25 °C/W
98.0 °C
95.0 °C
91.1 °C
81.0 °C
73.8 °C
64.3 °C
20
25
33
400 LFM
4.0 W
5.0 W
6.3 W
110 °C3 °C/W 2.30 °C/W 5.25 °C/W
98.0 °C
95.0 °C
91.1 °C
89.0 °C
83.8 °C
76.9 °C
20
25
33
600 LFM
4.0 W
5.0 W
6.3 W
110 °C3 °C/W 1.50 °C/W 4.50 °C/W
98.0 °C
95.0 °C
91.1 °C
92.0°C
87.5 °C
81.7 °C
20
25
33
800 LFM
4.0 W
5.0 W
6.3 W
110 °C3 °C/W 1.25 °C/W 4.25 °C/W
98.0 °C
95.0 °C
91.1 °C
93.0°C
88.8 °C
83.2 °C
Loading...
Terms of Use | Privacy Policy | DMCA Policy
2006-2020 Rsmanuals.com