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DRV8843: Some questions

Hirotaka Matsumoto
Guru 27525 points
Part Number: DRV8843
Other Parts Discussed in Thread: DRV8870

Hi all

Would you mind if we ask DRV8843?
Please refer to the attachment file, and could you give us the advice?
20180718_DRV8843.pdf

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Guru** 114905 points
    Hi Matsumoto-san,

    What is the VM voltage? We will investigate and reply by Friday.

    Has the customer considered a different device like the DRV8870? How many different current limit values are needed?
  • 0 in reply to Rick Duncan
    Guru 27525 points

    Rick san

    Thank you for your cooperation!
    We are wait for your reply.

    What is the VM voltage?
    ->24V

    Has the customer considered a different device like the DRV8870?
    ->Yes, they has. However DRV8870 is more expensive compared with DRV8843 per CH.

    How many different current limit values are needed?
    ->Aout : Avref=1.8V, Isens=1.2ohm ->0.3A limit
    ->Bout : Avref=3.3V, Isens=GND -> No limit, only OCP, or maximum setting

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    TI__Guru** 114905 points
    Hi Matsumoto-san,

    Correct. The DRV8870 is more expensive per channel. But only one channel is required to operate the motor.

    The DRV8870 VREF can be adjusted to raise or lower the current limit of the DRV8870.
    Also signals need to be controlled at the inputs of the device.

    We will continue to check into the your question on configuring the DRV8843.
  • 0 in reply to Rick Duncan
    TI__Guru** 114905 points
    Hi Matsumoto-san,

    The circuit shown works, but there is a leakage path to be aware of.

    When VM >~12, there is a leakage path from the used input through the unused output to GND.
    This path can consume up to 10mA @24V, or ~.25W.

    The path cannot be disabled.