I have been struggling for the last few hours trying to find a suitable power inductor for a LC filter at the 12V (car 12v) power entry on my board. The reference design used 150uH/1000uF. I have no problem finding the cap, but finding a large inductor that will take +-15A RMS loads is another story. They are either inexistant or very expensive (like 15$ a pop).
Does anyone with experience on automotive power supplies have a suggestion of a LC combination that works well to filter off most of the noise using lower inductance? 12V entry first goes through a schottky barrier, then I have a 20V 600W TVS clamp, and LC filter would come next.
Or maybe I could wind it myself too, I can find the ferrite, but I don't know much about winding inductors. How many turns and what size wire to use?