Sharing Some Knowledge On Mosfets and Gate Drivers

Discussion in 'The Projects Forum' started by ashkarmalik, Dec 19, 2015.

  1. ashkarmalik

    Thread Starter Member

    Jul 1, 2012
    Hello ,
    I am learning about Mosfets and Gate Drivers,So I need some Advice,
    1)Does the the MOSFET gate driver with Bootstrap Capacitor require Input that is PWM or Does the Bootstrap circuit is Self Oscillating?
    2)How to figure out that a Particular Mosfet gate driver have DC(signal) input or PWM input acceptance ?

    This is an driver I need to drive -

    Kindly through some light.
  2. Picbuster

    Active Member

    Dec 2, 2013
    Please read that document it will answer all your questions.
    I am no sure if this question should be addressed in this project form. looks homework related.
  3. ronv

    AAC Fanatic!

    Nov 12, 2008
    Bootstrap requires pwm.
    Charge pump has it's own oscillator for DC.
  4. spinnaker

    AAC Fanatic!

    Oct 29, 2009
    ENOUGH already! This site is about learning. If you have nothing of value to post other than RTFM then please don't post. If others don't want to be bothered by a question then they won't answer. But most people graciously invest valuable time and answer questions because they want to help and they realize documents like datasheets can be confusing to those not used to reading them. I for one am extremely grateful to all of those that answer my "dumb" questions, to which answers can be found in some confusing datasheet.
    shortbus, tom_s, DNA Robotics and 2 others like this.
  5. ashkarmalik

    Thread Starter Member

    Jul 1, 2012
    @ Ronv ,Thank You for taking out some time to make me understand BootStrap Oscillator method.
    So What I Conclude is that, If I would Supply Pure DC into the Input Pin of the Upper or the lower side of the Gate driver then the gate Driver IC Would Work like a champ.No Need to Put PWM Into the Input side of the Gate Driver(I mean If I just want to test it)Right!
    @ Spinnake I totally agree with you,Thanks for you support.
  6. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    The source pin of the top FET must toggle for the bootstrap to work. So pulsed DC on the HI pin is necessary.
  7. hp1729

    Well-Known Member

    Nov 23, 2015
    Can you please give me a paragraph on the term "bootstrap" used this way?
    In the provided data sheet paragraph talks a bit about it but I'm not sure I grasp the concept. Does the bootstrap just speed up turning the high side MOSFET on?
    Last edited: Dec 20, 2015
  8. ronv

    AAC Fanatic!

    Nov 12, 2008