M.L. escreveu:
> On Sun, Oct 18, 2009 at 8:27 AM, Kevin <kben@dca.net> wrote:
>   =

>> What's the difference between Vgs and Vgs(th) I thought the
>> Vgs(th) was the voltage to turn it on fully ?
>>
>>     =

>
> Vgs(th) is the voltage where a pre-defined level of current can flow.
> To turn it on fully you need a higher voltage. Check the Ids vs. Vgs
> graphs in the datasheet. You want the voltage to be well above
> whatever your maximum current will be. Most of the time this ends up
> being 12v or sometimes 15v (for normal MOSFETs)
> Logic-level MOSFETs have a lower Vth so you can get by with a lower
> gate voltage, but the Rd-s resistance is higher.
>   =


Vgs(th) (threshold) is the gate voltage below that no current flows at all.


Isaac

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