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DRV8340-Q1: Independent Half-Bridge PWM Mode versus 3x PWM Mode

Kelvin Le THS
Expert 7855 points
Part Number: DRV8340-Q1

Hi,

Is there a difference between "Independent Half-Bridge PWM Mode" versus "3x PWM Mode"?

The truth table is the same.  I want to use use this DRV for brushed motor drive.  It has good source/sink capability.

-Kelvin

  • 0
    TI__Guru 65220 points

    Kelvin,

    Thanks for posting on the MD forum!

    3x mode has the VGS and VDS monitoring enabled which will prevent shoot through within the same phase.

    Independent mode disables this protection so that the 3 high and 3 low gate outputs can be used independently. If you plan on using one phase to drive high and another phase to drive low then 3x mode is suitable for you.

    Regards,

    -Adam

  • 0 in reply to Adam Sidelsky
    TI__Expert 7855 points

    Adam,

    Were you referring to "independent MOSFET mode"?  

    I was asking about the "independent half-bridge mode", which does have those protection features as far as I can tell (correct me if i'm wrong).  In section 8.3.4.4 of the datasheet, it explains the differences b/w the various modes and fault responses.

    -Kelvin

  • 0 in reply to Kelvin Le THS
    TI__Guru 65220 points

    Kelvin,

    Yes my mistake, I forget that this device has one more mode that the other devices don't have, that's the independent half bridge mode.

    3x PWM mode and independent half bridge mode are very similar but 3x PWM handles the dead time for you (since you don't control the LS FET) while independent you can control it on your own.

    Regards,

    -Adam