• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 31 subscribers
  • Views 1067 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV8301/2 shoot through protection

Johan de Leeuw
Prodigy 20 points
Other Parts Discussed in Thread: DRV8301, DRV8302

Hello!

I am interested in using the DRV8301 or DRV8302 for a 48V/60A brushless motor driver but I am not sure about the shoot through pretection of the device.

I would like to know how the shoot through protection works on the DRV8301/2 gate drivers.

The datasheet ( http://www.ti.com/lit/ds/symlink/drv8301.pdf states the following:

"Internal hand shake between high side and low side FETs during switching transition to prevent current shoot
through."

The addition of "during switching transition" throws me off.

I would like to know what happens when my input logic (PWM with six independent inputs) makes a fault and turns on both the LOW and HIGH input pins of a phase.

The initial dead-time control would prevent shoot-through, but what happens after this period?

Also what would happen if the HIGH input is high level and then the LOW side input goes high while keeping the HIGH input high.

And vice versa, LOW side is on and HIGH side is switched on while keeping the LOW side on.

Kind regards and thank you for your response,

Johan de Leeuw

  • 0
    TI__Mastermind 21320 points

    Hi Johan,
    The internal logic does not allow for both the high-side and low-side gate to be ON at the same time for a half-bridge. When both inputs are high, the outputs will go to Hi-Z (both gates are driven LOW). Same as if both inputs were low.

  • 0 in reply to Nicholas Oborny
    Prodigy 20 points

    Hi Nicholas,

    Thank you for your reply!

    This is what I was hoping for! (and expecting but just not sure)

  • 0 in reply to Johan de Leeuw
    Prodigy 20 points

    Hello. I'm working on a problematic project with high emi, (fast switching of very high current)

    So i'm wondering how fast is your driver in shoot through protection.

    Is it instantainous? What happens when in 3-phase bridge made of this drivers, all 6 inputs go high due to procesor fail?

    Or what if inputs starts to switch randomly with very high frequency 20mhz for example?

    So far competing drivers from other companies got random results mostly bad, and i'm looking for good reliable product.