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AMC1306M25: What is the DC accuracy parameter from -250mV to -320mV and 250mV to 320mV

?? ?
Prodigy 130 points
Part Number: AMC1306M25
Other Parts Discussed in Thread: AMC1306M05

Tool/software:

hi

 I want to know  the  DC accuracy  parameter   from -250mV to -320mV  and 250mV to 320mV  for a worst Case  Calculation， could you provid it？ thank you！

  • 0
    TI__Expert 8455 points

    Hello,

    The region between the FSR of the device and the clipping voltage will have reduced accuracy compared to staying within the recommended operating conditions but should be similar. This is not something we have specified in the data sheet. What is your system's accuracy requirements?

    Best regards,
    Eva

  • 0 in reply to Eva Mason
    Prodigy 130 points

    hi     TUE   requirements   less than 2.5mV

  • 0 in reply to ?? ?
    TI__Expert 8455 points

    We cannot guarantee performance past the FSR since it is outside of the recommended operating conditions and is not specked. If you plan on measuring within the clipping range, I would recommend adjusting your shunt resistor size to get the input within the acceptable range to ensure you meet your accuracy requirements. What's you application? What is your current sensing range?

    Best regards,

    Eva 

  • 0 in reply to Eva Mason
    Prodigy 130 points

    What's you application?---------- PMSM MOTOR  phase Current sample

    What is your current sensing range? -----shunt resistor  value is  4mΩ， Motor peak current is 77.48A，  AMC1306M25  input  max  77.48*4.01=313.1mV（shunt resistor  accuracy  1%），Consider  the the ADC  accuracy， I dont want to see  it beyonds  320mV 

  • 0 in reply to ?? ?
    TI__Expert 8455 points

    I would recommend sizing the shunt resistor such that the input to the AMC device is not beyond 250mV. A 3mΩ-3.2mΩ would work well. Be sure to consider power dissipation as well when selecting a shunt resistor. 

    Also, for higher currents such as 77A, you could also consider the AMC1306M05. This has a 50mV input and is typically used for higher currents. 

    Best regards,

    Eva