simultaneous conduction

Discussion in 'General Electronics Chat' started by TAKYMOUNIR, Nov 10, 2011.

  1. TAKYMOUNIR

    Thread Starter Active Member

    Jun 23, 2008
    351
    1
    how can avoid the effect of simultaneous conductin in FET (AND IF SOME ONE KNOW GOOD LINKS TALKING ABOUT IT CAN SEND ME THE LINK PLEASE
    THANKS
    ----
    How can i make the fet turn on and off fast i need the rise and fall time less than 1 micro second
    thanks
    ----
    How can i drive mosfet fast i need rise time and fall time less than 1 micro second
    thanks
     
    Last edited by a moderator: Nov 10, 2011
  2. praondevou

    AAC Fanatic!

    Jul 9, 2011
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    488
    Please tell us what FET you are talking about and what driver u are using.

    Cross-conduction can be avoided by an appropriate deadtime.

    The time it takes to charge the gate depends mainly on the gate charge Qg, the lead inductance, gate/source wire inductance/length and the driver's current capability.
     
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  3. shortbus

    AAC Fanatic!

    Sep 30, 2009
    4,013
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    Use a dedicated mosfet gate driver chip instead of trying to do it with discrete components.

    Keep the driver as close to the mosfet as possible.

    Use the correct value gate resistor from driver to gate. Values over 50 ohms are usually not correct. Values in Kohms are almost never correct.
     
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  4. TAKYMOUNIR

    Thread Starter Active Member

    Jun 23, 2008
    351
    1
    in general how can i design gate drive circuit
     
  5. SgtWookie

    Expert

    Jul 17, 2007
    22,182
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