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Switching loss in lm3445 LED driver circuit

WADE NOVIN
Prodigy 100 points
Other Parts Discussed in Thread: LM3445

Is there a simple formula to calculate the switching loss in, or power dissipation of the switching FET Q2 as given in the application note 

http://www.ti.com/lit/ds/symlink/lm3445.pdf

Because the input voltage is sine function the voltgeXcurrent loss probably requires some integration.

Thanks in advance,