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DRV8307 Using Motor > 32V

Matthew Dyhrberg
Prodigy 75 points
Other Parts Discussed in Thread: DRV8307, DRV8307EVM

I am wondering if it is possible to use the DRV8307 with a motor >32 VDC.

I would like to use a BLDC motor driven at rectified 230 VAC (nominally 207 VDC).

The external switches (preferably IGBTs) would connect to 207 VDC and VM, U, V, and W inputs to the DRV8307 would be scaled to a maximum of, say, 24V.

  • 0
    TI__Mastermind 26065 points

    Hi Matthew

    Generally it is not possible to drive such high voltage motor with DRV8307. We will not able to connect phase directly back the device.

    But if you are using photocouplers to drive the IGBT, maybe you can use DRV8307 to driver the photocoupler stage. But we are short of bench test dates on this scheme and also the device are not designed in this way.

    If you understand the IGBT driving very well and think it is truly worthy to try this, we can give as much as we have on DRV8307 side, but truly limited support on you.

    Best regards,

  • 0 in reply to Wilson Zuo
    Prodigy 75 points

    Thanks for your reply, Wilson.

    I've ordered a DRV8307EVM and I'll consider the best way to connect and evaluate this option.

    Kind regards

  • 0 in reply to Matthew Dyhrberg
    TI__Mastermind 20985 points

    Hi Matthew, the high-side motor voltage must match the DRV8307 VM, because the DRV8307 measures the voltage drop across each FET versus the phase to detect overcurrent.  This is parameter VFETOCP.

    Best regards,
    RE