Inductor Serial Resistance for DC step

[Mustafatarhan49]

Hello all,

I have a problem to find out the serial resistance of the inductance for the DC step. I have inductor value of 340uh, input voltage of 12V and inductor current of 30A after 1.2ms. can you please help me to find this value!
Thanks!

 

[kripacharya]

solve the equation -

IR/V = 1 - e^(- tR/L)

you should get R around 0.195 ohms or so

 

[Mustafatarhan49]

can you please write the steps how you have found 0.195. I could not get rid of the equation ?