What is softness factor of diode
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it relates to reverse recovery charge, Qrr during switch off of
diode.
The reverse current has to phases. 1st it reaches to max reverse
recovery value , Irrm (in opposite direction of forward current),
2nd it finally reaches to zero.
Softness factor,S is the ratio of the time is needed in phase 2,
t2 to the time needed in phase 1 t1, S= t2/t1