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DRV8824: Motor Driver derating

Daniel Liao
Prodigy 20 points
Part Number: DRV8824
Other Parts Discussed in Thread: DRV8424, DRV8711

What's DRV8824 internally limited spec.？

The datasheet shows 1.6-A Maximum Drive Current at 24 V and TA = 25°C.

If we use the VM is 12V, does it mean we can drive it reach 3.2A?

  • 0
    TI__Mastermind 37683 points

    Hello Daniel,

    Someone from our team will be reaching out to you shortly to answer your questions.

    Regards,

    Pablo Armet

  • 0
    TI__Prodigy 251 points

    Hello Daniel,

    In order to get a better understanding of your situation, I have some quick questions to ask:

    Is your original question paired with the assumption that the same amount of power dissipation can be kept by decreasing the voltage from 24V to 12V and increasing the maximum drive current from 1.6A to 3.2A?

    Or is the situation that you would like to have a lower thermal dissipation for a higher current (3.2A compared to the 1.6A in the datasheet for DRV8824)?

    Regards,

    Jaya Hari

  • +1
    Genius 5040 points
    Daniel Liao said:

    The datasheet shows 1.6-A Maximum Drive Current at 24 V and TA = 25°C.

    If we use the VM is 12V, does it mean we can drive it reach 3.2A?

    Hi,

    The 1.6A max output limit is due to the thermal limitation of the internal H-bridge FET, P=i^2 * R, where R is the FET on resistance, and not due to P=V * I. So even of VM is 12v the same 1.6A max is applied.

    Brian

  • 0 in reply to Brian Dang
    Prodigy 20 points

    Thanks for your reply.

  • 0 in reply to Pablo Armet
    Prodigy 20 points

    Thanks for your reply.

  • 0 in reply to Jaya Hari
    Prodigy 20 points

    Thanks for your reply. I want to increase the maximum drive current from 1.6A to 3.2A on VM 12V situation.

    So, I want to confirm the Peak motor drive output current spec, but I found missed OCP function.

  • 0 in reply to Daniel Liao
    Genius 5040 points
    Daniel Liao said:
    Thanks for your reply. I want to increase the maximum drive current from 1.6A to 3.2A on VM 12V situation.

    1.6A is continuous output current, and it will trigger the OCP if the current is 1.8A or higher; therefore, 3.2A is a wishful unrealistic dream.

    Brian

  • 0 in reply to Brian Dang
    TI__Guru 55565 points

    Daniel,

    Our highest power stepper motor driver is the DRV8424 which has a min OCP of 4A.  This would technically meet your specification.

    Full scale current is still thermally limited to 2.5A.  If you need full scale current of 3.2A, you will need to consider a gate driver like the DRV8711 with external FETs.

    Regards,

    Ryan