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TMCS1101: 3 phase AC400V system

Part Number: TMCS1101

Hello team,

 

Here is the customer’s inquires.

 

-    Is the TMCS1101 for DC current sensor of AC200V system ? Could it apply to AC400V (AC457V_MAX) system ?

-    Is it employed fixed gain or the other mechanism ? it seems non ratiometric.

-    Does the device have a magnetic cancelation function ?

 

Thank you and best regards,

Michiaki

  • Hello Michiaki,

    • Yes, the TMCS1101 can be used to sense DC current on an AC system. The maximum working isolation voltage is 600Vpk, so there is no problem with an AC 400V (AC 457V_max) system.
    • The device is available in fixed gains of 50mV/A, 100mV/A, 200mV/A, and 400mV/A. The gain is non-ratiometric, but the output is referenced to the power supply.
      • Bipolar "B" versions set the zero current Vout = 0.5 * Vs
      • Unipolar "U" versions set the zero current Vout = 0.1 * Vs
    • The device contains a single Hall effect sensor, so it does not have a magnetic cancellation function. Care must be taken to prevent the effect of stray magnetic fields on the device.
      • Next-generation devices from TI in this product family will use differential sensing for stray field cancellation.

    Best regards,

    Ian Williams
    Applications Manager
    Current Sensing

  • Hi Ivan,

     

    Please let me double check there is no problem for 3 phase AC 400V system.

     

    In the datasheet, Maximum working isolation voltage for DC voltage is 600VDC.

    So what you mentioned is TMCS1101 can be applied to up to DC link voltage is less than 600V.

    Is my understanding correct ?

     

    Our customer use 1200V power module, so I am afraid that TMCS1101 cannot be used in their system.

     

    Thank you and best regards,

    Michiaki

  • Yes, DC voltage up to 600V is okay. However if the new requirement is 1200V DC, the TMCS1101 cannot be used. The TMCS1101 can only withstand transient/surge voltages at that level, not continuous.

    Best regards,

    Ian Williams