Charge controller help

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Joined: 14/05/2006
Location: New Zealand
Posts: 493
Posted: 10:06am 26 Aug 2010      

> Vgs(th) is 2-4V.

This is what you want.

> Connecting the 10k on the irf9540 to the supply would turn it off as it is an p
> channel FET.

Correct, connecting the 10K to supply would keep it off as well as connecting it to ground. The gate would need to be negative w.r.t. ground to turn a P channel FET on.

I was referring to the IRF540, which I now realise you never had