Calculation of turn on and off time of IGBT transistor

[stoyanoff]

Hi, everyone! I have IGBTs with Qg=420nC. I have 10 ohms resistor in the gate circuit and Imax from my driver is 1A. So I think the turn on time is
t=Qg*R/I= 4.2us.
Am I right and is this time too big if my PWM frequency is 25kHz(60us per pulse)??
Thanks!

 

[Er.abdulrehman]

for PWM freq of 25KHz (1pulse will be of 40us).
What actually you want, will you elaborate?

 

[stoyanoff]

I want to know if I`m calcilating right the turn on and off time. Is my formula right?
Thanks!