gate resistance for fet

Discussion in 'General Electronics Chat' started by TAKYMOUNIR, Jul 31, 2011.

  1. TAKYMOUNIR

    Thread Starter Active Member

    Jun 23, 2008
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    why we make gate resiance high when we turn on fet and small when we turn off
     
  2. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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  3. TAKYMOUNIR

    Thread Starter Active Member

    Jun 23, 2008
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    thanks very much
     
  4. praondevou

    AAC Fanatic!

    Jul 9, 2011
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    If you are referring to a gate resistor with e.g. an anti-parallel diode, this is to change the switching behaviour of the FET, especially important in power MOSFETs. Heat dissipation of the FET, the driver and noise generated by the transistor's switching have to be considered when designing gate drives.

    There are many things to consider and I recommend you read http://focus.ti.com/lit/ml/slup169/slup169.pdf
    which will give ALL the answers you want (and all you don't want, too)
     
    Last edited: Jul 31, 2011
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  5. TAKYMOUNIR

    Thread Starter Active Member

    Jun 23, 2008
    351
    1
    thanks very very much
     
  6. TAKYMOUNIR

    Thread Starter Active Member

    Jun 23, 2008
    351
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    please i need to learn pic microcontroler so what is the easy and fast way to learn it
     
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