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DRV401: 100kHz probe frequency

Hiroaki Masumoto
Expert 1210 points
Part Number: DRV401
Other Parts Discussed in Thread: DRV421

Dear Support team,

My customer will use DRV401 in their application.
They use a magnetic current sensor that is not made by Vacuumschmelze GmbH & Co. KG (VAC).

The DRV401's datasheet describes that the recommend field probe oscillation frequency is from 250kHz to 500kHz.
But their magnetic current sensor is stable at an oscillation frequency of 100kHz.
They adjusted the inductance but did not stabilize at higher frequencies.

Are there any problems with using at 100kHz?


Best Regards,
Hiroaki Masumoto

  • 0
    TI__Mastermind 28720 points

    Hello Hiroaki,

    Thanks again for using the forum.  I am concerned that the probe is not reaching saturation.  Is there any way you can share the unsaturated inductance and the resistance of the windings for the probe you are using?

    Our datasheet mentions the min oscillation frequency as 250kHz.

  • 0 in reply to Javier Contreras4
    Expert 1210 points

    Hello Contreras-san,

    Thank you for your reply.

    I inquire about the information on the unsaturated inductance and winding resistance of the probe used by the customer.

    They also understand the lowest frequency as 250 kHz described in the data sheet.
    They do not want to guarantee 100kHz of the probe frequency.

    Best Regards,
    Hiroaki Masumoto

  • 0 in reply to Hiroaki Masumoto
    TI__Mastermind 28720 points
    Hello Hiroaki,

    I do not believe that the probe is getting saturated at 100kHz and I would not advise this. The probe needs to get saturated so the inductance is too high or the winding resistance could be too high to get saturated with the IS1 and IS2 drive capability.
  • 0 in reply to Javier Contreras4
    Expert 1210 points

    Hello Contreras-san,

    Thank you for your reply.
    I understood the content of the reply from you.

    I asked the customer for the unsaturated inductance of the probe being used and the resistance of the winding.
    However, no response has been obtained.

    I introduce DRV421 to the customer.

    Best Regards,
    Hiroaki Masumoto