trr diode
isurug, sorry if i'm too slow to understand :roll:
the first equation you gave me to calculate trr:
trr = sqrt(2*Qrr/(di/dt))
i can't finish the equation, because i don't know the value of Qrr, di, dt.
then you gave me the equation to calculate Qrr:
Qrr = irr * trr.
in my point of view, it's impossible to finish the equation.
lets say I know the value of irr, then the last thing I need is trr value then Qrr will be known.
but to find trr value I must know the value of Qrr ( first equation).
a loop ????
well since I'm not to bright, i'm also considering you suggestion to use assumes or approximates.
as you said max. trr=100ns
BYT56 diode has Ipeak foward surge current=80A, it's max. trr still 100ns??