mosfet mayhem the sequel

Discussion in 'The Projects Forum' started by ingram010, May 2, 2007.

  1. ingram010

    Thread Starter New Member

    May 2, 2007
    6
    0
    Hello,

    I am trying to switch 500vdc supply, I am using (Transistor,MOSFET,N Channel,SPP02N60S5) supplied buy RS.

    Problem - the 500v supply is on wether or not the gate has a supply.

    Attached is a sketchy schematic.


    Please, please can someone help?

    Many Thanks


    John
     
  2. nomurphy

    AAC Fanatic!

    Aug 8, 2005
    567
    12
    The power supplies must have the same common, see attached:
     
  3. John Luciani

    Active Member

    Apr 3, 2007
    477
    0
    Besides connecting the grounds together (as previously mentioned) you really should
    have a zener diode across the gate and source of the MOSFET (probably a cap too)
    to suppress switching transients.

    (* jcl *)
     
  4. ingram010

    Thread Starter New Member

    May 2, 2007
    6
    0
    thankyou for your help

    John
     
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