How do I use the equation and table that are attached to the transient thermal resistance curve in the data sheet?

The junction temperature Tvj doesn’t increase immediately when power losses are generated on a semiconductor chip. There is a time delay due to thermal capacity of materials composing the IGBT module. The equation in the data sheet shows the relationship of the transient thermal resistance to the pulse width tw when a single square wave pulse (power loss) is applied. Transient temperature rise of the junction ΔT(j-c) can be obtained from the transient thermal resistance.

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