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DRV8323: best practices for unused current sense amplifiers

Lenio Cacula
Genius 15970 points
Part Number: DRV8323

If a BLDC application is using a single shunt, (a) what is the best procedure for connecting the unused current sense amplifiers? (b) If the customer wants to use one of the current sense amplifiers for a function other than motor current sensing, would that be okay?

Thank you!

  • 0
    TI__Guru 62040 points

    Lenio,

    For an unused CSA we recommend the following:

    All CSA inputs (SPC/SNC) to GND

    SOx - Output of CSA floating

    The CSA should not be used for a different purpose because the SPx pin is also used for the source connection and discharge path for the Low Side FET gate. The unused CSA SPx and SNx should be connected to GND as well as the source pin of the low side FET.

    Regards,

    -Adam

  • 0 in reply to Adam Sidelsky
    TI__Genius 15970 points

    I thought the sources of all three low side MOSFET's could be connected to the shunt and that connected to one of the CSA's. Based on what you are saying, the shunt is connected to only one of the bridges. Can you please confirm?

  • 0 in reply to Lenio Cacula
    TI__Guru 62040 points

    Lenio,

    Assuming you are using the B channel CSA, I would connect SPA/SNA/SNB/SPC/SNC to the GND side of the sense resistor. Only SPB will be connected to the top side of the sense resistor.

    The source connection of all three low side FETs will be common and connected to SPB and the top of the sense resistor.

    Regards,

    -Adam