mosfet gate threshold voltage

[[email protected]]

http://www.powerdesigners.com/InfoWeb/design_center/articles/MOSFETs/mosfets.shtm
says:

4.5 Gate Threshold Voltage, VT , {VTH , VGS(th) }
VT is the minimum gate voltage at which the transistor will turn
ON.

Does this mean, 100% full ON? Or that the gate is Starting to turn On
(1% ON, for example)?

Do mosfets prefer to be fully on or fully off, or can they be run at
some point in the middle, continuously?

If I wanted a MOSFET to run at, say, 50% of full ON, would a MOSFET
cheerfully comply, or would it blow up?

Thanks,

Michael

 

[Eeyore]

http://www.powerdesigners.com/InfoWeb/design_center/articles/MOSFETs/mosfets.shtm
says:

4.5 Gate Threshold Voltage, VT , {VTH , VGS(th) }
VT is the minimum gate voltage at which the transistor will turn
ON.

Does this mean, 100% full ON? Or that the gate is Starting to turn On
(1% ON, for example)?

Threshold means starting to turn on..

Do mosfets prefer to be fully on or fully off, or can they be run at
some point in the middle, continuously?

Whichever you like subject to chip power dissipation and die temperature limitations.
Google for Motorola's AN1040 which goes into some detail about heatsinking.

If I wanted a MOSFET to run at, say, 50% of full ON,

Define 50% full on !

would a MOSFET cheerfully comply, or would it blow up?

It all depends. Cheerfully either.

As ever the devil is in the detail which you will have to learn I'm afraid.

Graham

 

[Phil Allison]

http://www.powerdesigners.com/InfoWeb/design_center/articles/MOSFETs/mosfets.shtm
says:

4.5 Gate Threshold Voltage, VT , {VTH , VGS(th) }
VT is the minimum gate voltage at which the transistor will turn
ON.

Does this mean, 100% full ON? Or that the gate is Starting to turn On
(1% ON, for example)?

** Go look up the word " threshold " in a dictionary - fool.

Do mosfets prefer to be fully on or fully off, or can they be run at
some point in the middle, continuously?

** Why do you keep posting questions you already know the answer to ?

Troll.

If I wanted a MOSFET to run at, say, 50% of full ON, would a MOSFET
cheerfully comply, or would it blow up?

** For you - it would rather blow up than be mauled by an idiot.



...... Phil

 

[[email protected]]

http://www.powerdesigners.com/InfoWeb/design_center/articles/MOSFETs/...
says:

4.5 Gate Threshold Voltage, VT , {VTH , VGS(th) }
VT is the minimum gate voltage at which the transistor will turn
ON.

Does this mean, 100% full ON? Or that the gate is Starting to turn On
(1% ON, for example)?

Starting to turn on, the datesheet will say what current, usually
something
like a few hundred uA

Do mosfets prefer to be fully on or fully off, or can they be run at
some point in the middle, continuously?

as long as you can get rid of the heat generated it doesn't matter

If I wanted a MOSFET to run at, say, 50% of full ON, would a MOSFET
cheerfully comply, or would it blow up?

Thanks,

Michael

what do you mean by 50% on?

as long as you stay within the limits of the datasheet things should
be ok

-Lasse

 

[[email protected]]

Starting to turn on, the datesheet will say what current, usually
something
like a few hundred uA

Thanks - you've been most helpful

as long as you can get rid of the heat generated it doesn't matter

Thanks!



what do you mean by 50% on?

1/2 ID_max

as long as you stay within the limits of the datasheet things should
be ok

-Lasse

Thank you very much for the helpful replies.

Michael