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GX1 Datasheet(PDF) 209 Page - National Semiconductor (TI) |
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GX1 Datasheet(HTML) 209 Page - National Semiconductor (TI) |
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209 / 247 page  Revision 1.0 209 www.national.com Package Specifications (Continued) Example 1 Assume P(max) =5Wand TA (max) = 40°C. Therefore: 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) = 10W and TA (max) = 40°C. Therefore: In this case, the heatsink under consideration is NOT ade- quate 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. θ CA T C T A – P ---------------------- = θ CA 85 40 – () 5 ---------------------- = θ CA 9 = θ CA T C T A – P ---------------------- = θ CA 85 40 – () 9 ---------------------- = θ CA 5 = |
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