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Question or low side sensing

S.Satoshi
Guru 21685 points

Hi All,

Our customer is looking for the solution of low-side sensing for 3 phase motor. Then please let me ask following question.

  1. Does IN+ of current sense amp need to have over 72V Common-Mode Range?
  2. Can current sense amp operate with V+=5V if 72V common- mode range needed?
  3. Do you have recommended device for 1ch, analog output and following configuration?

Best Regards,

Sonoki / Japan Disty 

  • 0
    TI__Mastermind 25875 points
    Sonoki-san,

    Please explain how IN+ node reach 72V. I assume FETs are out of phase.

    If I am correct, many solutions exist for your application because common-mode voltage is ~0V. To find best device, please give more information:

    1) Current range
    2) Shunt resistor value (if known)
    3) Frequency
  • 0 in reply to Pete%20Semig
    Guru 21685 points
    Hi Pete-san,

    That was my misunderstanding, so you are correct. I'll check the requirement you listed. I'll get back to you soon.

    Best Regards,
    Sonoki
  • 0 in reply to S.Satoshi
    Guru 21685 points

    Hi Pete-san,

    Here is customer's requirement.

    1) Current range : +/- 100A (Bi-Directional)

    2) Shunt resistor value : 50mohm (interim)

    3) Frequency : 400Hz

    4) Low side sensing

    5) Output : Analog, ADC in MCU can input up to 5V

    Please let me know if you need more information to select appropriate solution.

    Best Regards,

    Sonoki