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INA250: Would the alternating voltage go through the noise filter capacitor?

Yunlong Wang85
Intellectual 290 points
Part Number: INA250


I found the following part from the datasheet of INA250 chip,

During experiment, I use INA250 to measure the phase current of a stepper motor, and the Rs in above figure is 10 ohm. I found the the Rs resistor becomes so hot during experiments that its color becomes red and bright. Thus, I guess that the voltage can pass through the noise filter capacitor, Cf. Is my assumption right?

Thank you.

  • 0
    TI__Mastermind 27965 points
    Hello,

    Thank you for using the TI forum. We are currently out of the office, but will get back to you as soon as we can.
  • 0 in reply to Mitch M
    TI__Expert 4915 points

    Hi Yunlong,

    Thank you for using the E2E Forums.

    I need to understand whenever this and your last post are somewhat related.

    Before I am able to answer your query, I first need to understand how these phases are connected to both the supply and the stepper motor and where current is being measured, what kind of driver you are using, etc. so that I can try to reproduce the issue.

    Would you be able to provide me with:

    • A full schematic of your motor controller and where you are tapping to measure the circuit currents
    • The waveform for both motor phases. You might need a differential probe to be able to measure them depending on the algorithm employed.