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Td(on) and Td(off) parameters of a MOSFET

Discussion in 'General Electronics Discussion' started by mbferguson, Nov 16, 2018.

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  1. mbferguson


    Nov 15, 2018
    The Td(on) and Td(off) parameters are simply the turn on delay time and turn off delay time, respectively. When they say 'delay' how are they defining when the channel is considered to be not delayed? In terms of Vgs, they say the channel initially opens when Vgs = Vth, which is the voltage at which 100uA passes through the S-D.

    Since there is a Tr (rise time) also thrown in the mix, what exactly is going on here?

    The intended goal I have in mind is creating a 100ns pulse, as close to a square wave as I can, but not a deal breaker if its trapezoidal due to these time ramps.
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Without a dataset to refer to, Td probably refers to the time between the gate voltage changing and it's effect on the channel.
    mbferguson likes this.
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Googling for "mosfet td(on)" is a remarkably good start.

    See here. Page 8 has the information you require.
    mbferguson likes this.
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