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How to approximate power dissipation wave to square wave

As shown in Figure 1, integrate the actual waveform and approximate a square wave using the calculated integral value and the maximum power value of the actual waveform.

In the power dissipation waveform that is nearly a sine wave, approximate as below.
<approximate (area is nearly identical)>
crest value: 0.7 × PP Pulse width: 0.91 × tw

For another example concerning approximation, please refer to “Thermal Design and Attachment of a Thermal Fin: Power MOSFET Application Notes (PDF:1,061KB)

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