Another N channel enhancement mode MOSFET driven directly by a PIC12F629


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  1. #1
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    Default Re: Another N channel enhancement mode MOSFET driven directly by a PIC12F629

    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

  2. #2
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    Default Re: Another N channel enhancement mode MOSFET driven directly by a PIC12F629

    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
    Last edited by Acetronics2; - 20th April 2015 at 08:53.
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  3. #3
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    Default Re: Another N channel enhancement mode MOSFET driven directly by a PIC12F629

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

    Ioannis

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