Another N channel enhancement mode MOSFET driven directly by a PIC12F629

[Acetronics2]

So, yes, a low resistor in the order of 10-100 ohms max. is what you need. Or even better no resistor. Mosfets have insulated gate and no current flows through the gate (besides the spike to charge gate capacitance).

Ioannis

Hi, Ioannis

Without a series resistor, you could have some surprises ( the RMW well known "feature" ) ... try i.e. an IRFZ44 or IRL2203 - or some nF+ range gate capacitance device - ...

tested ( and debugged ) !

Alain

[Ioannis]

Yes you are right. Thats is why I spoted the "spike to charge gate capacitance". You cannot leave it to luck and some claculations need to be done after the study of the datasheets.

I had to be more careful to my statement and think that many are not engineers, but more like enthusiasts about electronics.

Also this "great" feature, RMW, can bite experienced people too.

Ioannis

[Acetronics2]

in fact, it's quite simple : try not to drain more than the 20 ma max current ...
so, a 220 to 270 Ohm resistor can be considered as the minimum value.

that gives +/- 2/3 µs min turn on/off time ...

and if not fast enough, a mosfet driver has to be used ...

Alain

[Ioannis]

Or a faster Mosfet with less capacitance or both. All depends.

Ioannis