Question about inductors, inductances, and 'bias currents'

[Etesla]

Hi all,

Inductor datasheets like this one:

https://www.digikey.com/product-detail/en/pulse-electronics-power/PG0077-202NLT/553-2034-6-ND/3179497

usually state that the actual inductance changes with the 'bias' DC current going through it. For example, the inductor above is spec'd at 1.66uH at the rated current, and 2uH with no current.

I want to know on what timescale the inductance actually changes. In other words, if I quickly changed the current through the inductor, how quickly would it's inductance react to that change in current?

I'm asking because I'm messing around with discontinuous mode switching power supplies. I want to know if modeling the inductor in spice as a constant valued inductance at high (above maybe 20 Khz) switching frequencies is accurate. I would, in that case, use the average or maybe RMS current through the inductor as the 'bias current' that I would use to get the actual inductance.

Thank you!

[ejeffrey]

Its essentially instantaneous.   The small-signal inductance will vary throughout the switching cycle.