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DRV8452: ground plane offset

Mees Trietsch
Prodigy 20 points
Part Number: DRV8452

Tool/software:

Hello,

Is it possible to connect all the ground pins of the DRV8452PWPR to a negative voltage rail to create an offset ground plane? If so, is there a limit to the offset (as long as the Vm-to-ground voltage stays under the rated Vm). All the grounds would be connected with each other to ensure that they have the same offset.
Or is this not preferred due to some internal workings of the driver.

  • 0
    TI__Mastermind 45445 points

    Hello Mees,

    If I understood correctly all the GND points shown in the below block diagram would be a negative voltage rail, correct? What would all the control signals and VCC referred to?  

    All the absolute MAX ratings are provided in the table below from the datasheet. If you were just isolating PGNDx from GND these have limits as well. Thank you.

    Regards, Murugavel 

  • 0 in reply to Murugavel4637
    Prodigy 20 points

    Hello,

    So if I understand correctly, if every ground is connected to the same negative voltage and all the other pins are in reference to this negative voltage, everything should work.

    For example, if the ground of the driver is connected to -10V, with respect to the rest of the system, every maximum voltage shown in the table drops by 10V.

    Thank you in advance

    Regards, Mees

  • +1 in reply to Mees Trietsch
    TI__Mastermind 45445 points

    Hello Mees,

    Assuming the control signals in your system to the driver, VREF and its VCC also would refer to this floating common of -10V which become the virtual ground, technically it should work. This would be true for any electrical circuit designed with floating common or a virtual ground connection.

    Regards, Murugavel