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gate driver circuit for mosfet

Discussion in 'General Electronics Discussion' started by dark night, Nov 14, 2012.

  1. dark night

    dark night

    4
    0
    Nov 14, 2012
    hi,
    I've designed a boost converter with a 30V input. It is running at 60% duty cycle.

    for pwm circuit i have been used pic to generate a pwm.



    so my question is (as shown in the circuit) hows the pwm inverted (after gate drive)

    any help to understand the operation of the gate drive?
     

    Attached Files:

  2. Harald Kapp

    Harald Kapp Moderator Moderator

    9,282
    1,881
    Nov 17, 2011
    PWM=0V:
    Q1 is off
    R5 biases Q2 = on, Q3 = off

    PWM=3.3V:
    Q1 is on
    Q2 is off, Q3 is on.

    That's not too difficult, is it?

    Harald
     
  3. dark night

    dark night

    4
    0
    Nov 14, 2012
    thank you so much
    your explanation is easy to understand.
     
  4. dark night

    dark night

    4
    0
    Nov 14, 2012
    hi,

    what the function of the diode D1?

    any help.
     
  5. BobK

    BobK

    7,626
    1,654
    Jan 5, 2010
    It is bypassing the gate resitor during the turn off phase to make it turn off faster.

    Bob
     
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