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SC1100 Datasheet(PDF) 345 Page - National Semiconductor (TI) |
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SC1100 Datasheet(HTML) 345 Page - National Semiconductor (TI) |
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345 / 348 page  Revision 1.1 345 www.national.com Package Specifications (Continued) Figure 8-1 is an example of a particular heatsink under consideration Figure 8-1. Heatsink Example Example 1 Assume P (max) = 5W and TA (max) = 40°C. Therefore: θCA = 9 The heatsink must provide a thermal resistance below 9 °C/W. In this case, the heatsink under consideration is more than adequate since at 5W worst case, it can limit the case temperature rise above ambient to 40 °C (θ CA =8). Example 2 Assume P (max) = 9W and TA (max) = 40°C. Therefore: θ CA = 5 In this case, the heatsink under consideration is NOT adequate to limit the case temperature rise above ambient to 45 °C for a 9W processor. For more information on thermal design considerations or heatsink properties, refer to the Product Selection Guide of any leading vendor of thermal engineering solutions. Note: The power dissipations P used in these examples are not representative of the power dissipation of the SC1100, which is always less than 4 Watts. 0 10 20 30 40 50 24 6 8 10 θCA = 45/9 = 5 Heat Dissipated - Watts θCA = 45/5 = 9 θCA = TC − TA P θCA = 85 − 40 5 θCA = TC − TA P θCA = 85 − 40 9 |
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