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TPSM831D31: precise current measurement

David Wang
Prodigy 10 points
Part Number: TPSM831D31
Other Parts Discussed in Thread: TPS53681

Tool/software:

Dear Sir,

   What's the role of (38h) IOUT_CAL_GAIN in current measurement (8Ch, READ_IOUT) ?

    Is there any setting example for precise current measurement of TPSM831D31 ?

    Thanks for any help you can provide.

  • 0
    TI__Expert 4335 points

    Hi,

    IOUT_CAL_GAIN (38h) sets the gain used by the controller to calculate output current from the current sense voltage. The current sense voltage provided by the power stages is expected to increase by 5mV for every additional Amp of current, so IOUT_CAL_GAIN should be left at 5mohm (hex value of D140h) in most cases. In the case that the current sense voltage gain and the controller gain is slightly mismatched, IOUT_CAL_GAIN can be used to tune the controller gain.

    You can find additional information on using IOUT_CAL_GAIN to tune current reporting in the datasheet for TPS53681, which is the controller used internal to TPSM831D31, available on TI.com: https://www.ti.com/product/TPS53681 

    Regards,

    Troy