MOSFET current flow

Discussion in 'General Electronics Chat' started by iulian28ti, Jan 22, 2010.

  1. iulian28ti

    Thread Starter Member

    Dec 4, 2009
    This may look like a silly question....

    Does a MOSFET allow bidirectional flow of current ?
    I'm not referring to the intrinsic diode, but at the drain-source junction.
  2. Audioguru

    New Member

    Dec 20, 2007
    A Mosfet variably adjusts its current in one direction. It has a built-in diode that conducts when the drain-source voltage is backwards.
  3. eblc1388

    Senior Member

    Nov 28, 2008
    Yes, of course. Provided that it is turned fully ON by applying sufficient voltage to the gate.

    Yes, I know.

    The intrinsic diode will allow current flow in one direction even if the MOSFET is NOT turned ON. However, then it has a standard diode drop of about 0.6V. If the MOSFET is turned ON by applying gate voltage at this moment, the 0.6V drop between source and drain will be reduced further, depending on Rds.
  4. iulian28ti

    Thread Starter Member

    Dec 4, 2009
    Well... that explains active rectification.
    Thank you :)