Just my two cents worth...
It's just not worth the time and effort to swap out components in this area of a MB. IMHO
The dc-dc converter is designed as a whole. Swap out one thing and you have to change another, and then another....etc. There are many more things that you have to design around than just Rdson, Gc etc. Trace length, Inductor resistance, ESR in the filter Capacitors. Change something and you really can't know (without a good spice simulation of the before and after) what affect it will have.
I'm not trying to shoot you down, just trying to convey the complexity of dc-dc conversion.
Oh one other thing, in the current multiple phase dc-dc converters used on MB's there are two FET's per phase. One of which is always on.
Even using the best components your still going to have to deal with 10 or 12 watts of heat being generated by the dc-dc converter. No matter what you use. Sounds like a new topic to discuss, 'The best way to cool MB FET's'.
Either way I couldn't find anything quickly about a BC240. Probably a end of life product that is discontinued. If you would like me to dig a little further just say so and I WILL find it.
|