voltage supply of a mosfet

Discussion in 'General Electronics Chat' started by neiji, Sep 28, 2007.

  1. neiji

    Thread Starter Member

    Jul 25, 2007
    19
    0
    I have just implemented a circuit and i have used a mosfet(IRF540) which has a Vgs=10V. However i have used a supply of 6V and consequently i am not obtaining any output. i would like to know if i should use a mosfet which has a Vgs=6 V can you please specify a mosfet which has a Vgs of 6v.
     
  2. nomurphy

    AAC Fanatic!

    Aug 8, 2005
    567
    12
    Vgs is the maximum gate voltage that can be applied without damage.

    I think you need to look at the spec for Vgs(th), which is the gate threshold voltage.

    For example, on the IRF540 it is 2.0V to 4.0V, which means you need to apply 4.0V or more (up to Vgs) to the gate to be sure the FET is turned fully on. And, be below 2.0V to make sure it is off.

    BTW -- the IRF540 has a Vgs of +/-20V.
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    You might give us more information about the voltage and current the FET has to handle. There are several logic level FET's that will fully turn on with 5 volts on the gate, but they tend to be light durt devices. The VN10LP is one I use a lot with logic, but it's limited to 30 volts and perhaps 100 ma.
     
  4. nanovate

    Distinguished Member

    May 7, 2007
    665
    1
    Try IRLZ44N
    http://www.irf.com/product-info/datasheets/data/irlz44n.pdf
    Vgs(max) = 16V
    Vds(max) = 55V
    and specified for 4V gate to source

    If you really were supplying 6V to the IRF540 then you should have seen "some" output. Please post your schematic so we can be sure you had it correctly hooked up.
     
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