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What exactly to do with the derating in operating temperature range?

Latest Updated:02/01/2008

Question:

The FAQ has the following about the operating temperature range: "Use with derating so that the junction temperature does not exceed 150°C." What exactly should be done for this derating?

Answer:

When a case temperature is 100°C in the example shown in the figure, in order to operate in the safe operating range, the power consumption must be limited to less than 40% of that at 25°C. Derating refers to lowering the usage conditions, taking into consideration the ambient temperature around elements and the rise in temperature generated by the elements themselves.
In the case of use in the area above 40% in the figure, the junction temperature exceeds the absolute maximum rating of 150°C.

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