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TMCS1133: Continue -30A Condition Issue

Francis Jiang
Expert 3690 points
Part Number: TMCS1133


Tool/software:

Hi Team,

Customer would like to know when he use TMCS1133C1A in continue -30A condition, whether this device will be damaged? Or output 0V? Thanks in advance.

BRs,

Francis

  • +1
    TI__Expert 8855 points

    Hello Francis,

    The TMCS1133 is more than capable of having -30A continuously flow through the device pins, however the C1A variant is designed as a unidirectional part, so the output at -30A will be driven down to the GND rail swing limitation.

    Let me know if you have any more questions,

    Levi DV

  • 0 in reply to Levi DV
    TI__Expert 3690 points

    Hi Levi,

    I agree with your comments of current range, and this question is going to confirm whether the Precision AFE & Output Amplifier will be damaged due to high common mode voltage through into input pin. Thanks.

    BRs,

    Francis

  • 0 in reply to Francis Jiang
    TI__Expert 8855 points

    Hello Francis,

    You did not mention anything about a high voltage, can you explain what you mean?

    The TMCS1133 generally offers a high reinforced isolation rating - up to 849V DC.

    Thanks,

    Levi DV

  • 0 in reply to Levi DV
    TI__Expert 3690 points

    Hi Levi,

    You misunderstand it.

    The secondary current generates an induced voltage based on electromagnetic induction and it transmits to the primary side.

    My question is whether this voltage exceed the common mode voltage withstand voltage of the primary output amplifier? Since Vs should also be used as the power supply for output amplifier, if it exceeds CM voltage, it may cause damage to output amplifier.

    BRs,

    Francis

  • +1 in reply to Francis Jiang
    TI__Expert 8855 points

    Hello Francis,

    I think you are misunderstanding slightly how the TMCS1133 works. The TMCS1133 is a Hall-effect sensor and doesn't rely on inductive coupling but instead measures the magnetic field directly. So there is no risk of the current inductively coupling into the device and causing any problems.

    The current levels you have described sound fine to me.

    Let me know if you have any more questions,

    Levi DV