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Sorry to resurrect this thread, but I finally got a hold of some IRLZ24's, and
decided to try out a little electronic switch with a fan. I basically have the
output of a FF connected to the gate of the mosfet through a resistor, which
then has a fan going across it. When the fF output is on, the gate see's +5V,
which is well above the threshold, but the source only gets about +3V. I tried
removing the FF and just applying +5V directly to the gate, and same results.
But when I apply +12V to the gate, the fan turns on fully and source gets
+12V. Am I doing something wrong? (I have attached schematic)

Jai

Quoting Dwayne Reid <dwayner@PLANET.EON.NET>:

> At 11:06 AM 2/11/03 -0300, c.i.tronics@terra.com.br wrote:
> >Hello John,
> >
> >>I use IRLZ Mosfets (ie IRLZ24) - logic level switched HexFets - switching
> >>12 volts, using just a 100 ohm resistor from the port pin to the gate
> >>(don't need drivers). They have a very low Rds (0.1 ohms),  and are rated
> >>at 60volt / 17 amps.
> >
> >     I've been using IRF530's to switch 24V, "just a 100ohm resistor
> >from the port pin to the gate" also and it's working very well.
> >
> >     Someone knows if this could lead to problems after some time?
>
> What is your load?  If the FET is enhanced adequately for your target drain
> current - no problem.  The manufacturer's data sheets are your friend:
> study the curve that shows Rds vs Vgs.  You want to make sure that a
> different batch of FETs won't cause you problems just because they are
> somewhat different than the FETs you are using now.
>
> Personally - I'd use the 'L' version of the FET.
>
> dwayne
>
> --
> Dwayne Reid   <dwayner@planet.eon.net>
> Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
> (780) 489-3199 voice          (780) 487-6397 fax
>
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