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Original question:

DRV8316: DRV8316 Ioffset_Current sense offset low side current in of CSA

DRV8316: Regarding current sense amplifier offset correction

Daisuke Higa
Genius 3475 points
Part Number: DRV8316

Hi support team.

My customer has asked me regarding current sense amplifier offset correction.

・Is I_offset taken into account in the following equations?

・Is it okay to understand that "ix_sensed" is a measured value of phase current?

Best Regards,

Higa

  • 0
    TI__Mastermind 26046 points

    Hi Higa-san,

    Is I_offset taken into account in the following equations?

    Yes, any current induced offset is taken into account for these equations. These equations are used to resolve dynamic CSA offset issues in this revision of DRV8316 silicon.

    Is it okay to understand that "ix_sensed" is a measured value of phase current?

    "ix_sensed" means the value calculated from SOA/SOB/SOC when you use the normal equation to calculate phase current:

    Thanks,
    Aaron

  • 0 in reply to Aaron Barrera
    Genius 3475 points

    Hi Aaron-san

    Thank you for answering.

    I understand the following:

    Ix_sensed = IOUTx,

    ix_sensed = (1 / ± GAIN) (SOX-VREF / 2)

    (SOX includes offset voltage)

    After measuring SOX voltage, the phase current is estimated by equations (5) to (7).

    Is the above understanding correct?

    Best Regards,

    Higa

  • +1 in reply to Daisuke Higa
    TI__Mastermind 26046 points

    Hi Higa-san,

    Yes, your understanding is correct. 

    Thanks,
    Aaron