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DRV8436: Specification of AOUT and BOUT current matching

Hirotaka Matsumoto
Guru 27525 points
Part Number: DRV8436

Hi all

Would you mind if we ask DRV8436?

There is the specification of AOUT and BOUT current matching on the datasheet.
We have some questions about it.

<Question1>
Is it accuracy between Aout current and Bout current?
So, if this "AOUT and BOUT current matching" is good, torque nonuniformity is improved, right?
Is our recognition correct?

<Question2>
There is this description at another devices until now.
Why do you need to describe it?

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Guru** 114905 points

    Hi Matsumoto-san,

    There is the specification of AOUT and BOUT current matching on the datasheet.
    We have some questions about it.

    <Question1>
    Is it accuracy between Aout current and Bout current?
    So, if this "AOUT and BOUT current matching" is good, torque nonuniformity is improved, right?
    Is our recognition correct?

    Accuracy is the +/-7.5% or +/-12% listed in the datasheet.

    Current matching states that the two channels will be between +/-2.5% of each other.
    Yes, torque nonuniformity is improved if the two channels are closely matched.


    <Question2> 
    There is this description at another devices until now.
    Why do you need to describe it?


    This question about matching has been asked because the current control loop has been integrated.
    The concern about accuracy is one channel could -7.5% and the other channel could be +7.5%. At 1.5A, this could lead to 225mA current difference in the two windings.

    With current matching, the maximum difference in winding currents at 1.5A will be +/-2.5% or 40mA. The 40mA is based on +7.5% accuracy ((1.5A + 7.5%) * 2.5% matching).