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DRV8306: Isolation

Jeff Graham
Prodigy 10 points
Part Number: DRV8306

Tool/software:

Can you use the gate outputs to drive an isolated gate drive for a 270V motor? I would set VM at 6-7V. Would it be necessary to still use the charge pump to avoid getting a fault? If so and I use VM at 7V what would the about voltage be on the high and low side gates? 

  • 0
    TI__Mastermind 24070 points

    Hi Jeff,

    1. Could you provide a block diagram of the system you are asking about so I can understand how you plan to connect the DRV8306, isolated gate drivers, and motor?
    2. Are you planning on driving a brushed or brushless motor?

    For another solution to drive a 270V BLDC motor, I recommend taking a look at the DRV7308 which is an integrated FET device and capable of driving a 270V motor directly.

    Regards,

    Joshua

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 10 points

    Motor is BLDC 1-8kW range at 270Vdc 

  • 0 in reply to Jeff Graham
    TI__Mastermind 24070 points

    Thank you for the block diagram! I will need some time to review if this can be done. I will aim to provide a response by the end of the week at the latest.

    Regards,

    Joshua

  • +1 in reply to Joshua Horlander Cruz
    TI__Mastermind 24070 points

    Hi Jeff,

    There should not be an issue with using the gate driver outputs of our motor gate drivers to drive an isolated gate driver. The concern here would be to make sure that the output of GHx and GLx are with spec of the  isolated gate drivers inputs.

    With the inline phase sensing, this will only work if the voltage is stepped down to a voltage our device can handle.

    Jeff Graham said:
    I would set VM at 6-7V. Would it be necessary to still use the charge pump to avoid getting a fault?

    Our motor drivers have a undervolted protection feature for the charge pump. So you will have to use the charge pump or the device would go into fault.

    You can expect the GHX and GLX voltages to be roughly 6V above VM when VM is 7V.

    Regards,

    Joshua