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AMC1311: Can AMC1311 be used for isolated shunt current sensing applications? If not why?

RUPALI VINAYAK
Prodigy 120 points
Part Number: AMC1311
Other Parts Discussed in Thread: AMC1300

Can AMC1311 be used for isolated shunt current sensing applications? If not why?

  • 0
    TI__Guru**** 181521 points

    Hi Rupali,

    Welcome to our e2e forum!  You could use the AMC1311 for isolated shunt current applications but it is not necessarily the most efficient device to use.  The main issue you will face is power dissipation.  How much current are you trying to measure? 

  • 0 in reply to Tom Hendrick
    Prodigy 120 points

    Hi Tom,

    Actually we want to measure atleast 250A of current and the shunt resistor available with us is 1.5 mohms. So the input voltage range we need is around 375 mV. And all the existing TI isolated amplifiers meant for current sensing have no more than 250 mV range.

    So I was wondering if we can use the AMC1311 without much loss?

  • 0 in reply to RUPALI VINAYAK
    TI__Guru**** 181521 points

    At 375mV, you are at less than 20% of the AMC1311 input voltage range.  So - if you can reduce your shunt to 1m Ohm to fit the input range of the AMC1300 for example, that would be a better option.  You could also consider putting an amplifier ahead of the AMC1311 to gain up your signal, but the challenge there might be with the high input impedance of the AMC1311.