What kind of component is this?

Discussion in 'General Electronics Chat' started by Scalpel78, Nov 15, 2014.

  1. Scalpel78

    Thread Starter Member

    Aug 11, 2013
    49
    0
    Hi, I'm looking at the schematics for Pololu's Dual MC33926 Motor Driver Shield, and I have a question about a part of the circuit.

    [​IMG]

    This is the part of the circuit where battery power comes in, and feeds the motordriver. But what kind of component is Q1? Is Q1 and D1 some kind of reverse polarity protection?
     
  2. ISB123

    Well-Known Member

    May 21, 2014
    1,239
    527
    Pchannel Mosfet I guess.
     
  3. cmartinez

    AAC Fanatic!

    Jan 17, 2007
    3,574
    2,545
    Yes, it seems that that's exactly what it is, it is a P-mosfet configured as a high efficiency diode, with barely any voltage drop. Check this video, it gives a clear (and humorous) explanation of how it works
    .
     
  4. Scalpel78

    Thread Starter Member

    Aug 11, 2013
    49
    0
    Thanks! Nice video :)
     
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