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Original question:

DRV8323: Digital input deglitcher delay

DRV8323: Minumum PWM pulse and dead time

Sparsh Bhonwal
Prodigy 20 points
Part Number: DRV8323

Hello,

I would like to know what is minumum PWM pulse possible with DRV8323 and how is it affected by the dead time which is minimum set to 50 ns which I belive is in addition to fixed dead time which automatically adjusted by the drivier.

Kind Regards,

Sparsh

  • 0
    TI__Guru 61280 points

    Sparsh,

    Dead time is measured between the high side and low side swtiching edges so these do not effect the minimum pulse ON time which was answered in the previous post.

    The dynamic dead time depends on your system, parasitics, component selection, etc.

    Regards,

    -Adam

  • 0 in reply to Adam Sidelsky
    Prodigy 20 points

    Hello Adam,

    Yes I do understand that, I do want to use a MOSFET between 3 to 7 nC, a rough calculation shows that such a MOSFET can be opened or closed using a 1 Amp gate drive in under 10 ns, however I wanted to make sure if there is nothing in Gate Drive which could prevent it such as dead time etc.

    Kind Regards,

    Sparsh Bhonwal

  • 0 in reply to Sparsh Bhonwal
    TI__Guru 61280 points

    Sparsh,

    Typically our customers cannot switch FETs faster than 100-200nS because of board parasitics. I would not recommend trying to switch at 10nS unless the PCB is very well controlled and manufactured. When you begin experimenting, please use a lower IDRIVE at first and step up until you reach the PCB/component limitation. When trying to switch too fast, the inductance of the PCB and FET will cause voltage overshoot and undershoot on the gate and source lines which can damage the FETs and DRV if not controlled. Please check the system with a scope carefully.

    Regards,

    -Adam