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looking for high voltage mosfet

Discussion in 'Electronic Components' started by Tolstoy, Apr 19, 2007.

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  1. Tolstoy

    Tolstoy Guest

    Hi all, I've looked around but haven't had any luck finding a logic
    level n-channel mosfet rated around 400 volts Vds. I have bought
    automotive coil driver logic level IGBT's before, but this time I'd
    like to use mosfets.
    The mosfet needs to turn hard on at six volts and conduct several
    amps. I'd like to get Rds around a tenth of an ohm; I'll parallel
    them if I have to.
     
  2. Ray King

    Ray King Guest

    Hi,

    I think Motorola was the only 5v logic 400v fet. Most folks use an IC ( TTL
    5 voltage to 12v out put 4730 ? )or an npn in the common base mode. Drive
    the emitter from 5v ( 1k in the base to the 5v supply ) the collector with a
    resistor pull-up to 12v. A buffer on the output is a good idea.
    Ray



    I think it wou
     
  3. Or something from "The Best Of EDN". (One of my favourite ideas of all.)

    Try an n-channel JFET, gate to common ground, pull-up resistor on the
    drain to 12V, input to the source. Anything over 1 to 2V input should be
    fine. This single FET (and pullup resistor to 12V or so) will make a non-
    inverting level translator to give you the volts needed by the MOSFET. I'm
    assuming that your positive turn-on voltage means you're using an
    enhancement mode FET, so if not, this idea will need rethinking.
     
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