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Recommended Current Sense Device for Design

RJ
Intellectual 2550 points
Other Parts Discussed in Thread: DRV110, AMC1100

Hello All!

I am working on a overload relay reference design using the DRV110 and was hoping I could get some input on what current sense / comparator device I should use. This design is for a line voltage of 120V (posted in photo). I looked at the portfolio for both products, but wanted suggestions since there are so many to choose from. 

I'd appreciate any and all help!

Thank You,

Ramon

  • 0
    TI__Genius 15760 points
    Hi Ramon,

    I will get back to you on this.
  • 0
    TI__Genius 14825 points
    Ramon,
    Is this 120V AC or DC?
    Most of our current shunt monitors go up to 80V common mode or less so 120V would require an AMC1100 type device or a magnetic current sensor. Let me know and I can see what we have that may work for you.
  • 0 in reply to Jason Bridgmon
    Intellectual 480 points
    Hi Jason,
    Sorry to interrupt… My name is Idan and I'm electronic engineer for IAI Company.
    According to AMC1100 datasheet, the amplifier has Common-mode operating range of -0.16 to VDD1 (6V). In that case, why did you recommend it for current measurement above 120V? In my application I have to measure about 0-4A in voltage phase of 350V (High side or Low side). Can I do that using the AMC1100 amplifier? If not, do you have any recommendation for isolated amplifier that certified to high voltage standards?
    Thank a lot,
    Idan
  • 0 in reply to Idan Ozana
    TI__Guru**** 174981 points

    Hi Idan,

    As I mentioned on your other post - The AMC1100 is rated to withstand 4250 Vpeak with a continuous working voltage of 1200 V, so there is no issue in using it for your application of 350 VDC.  You can do either high side or low side sensing - if you want to do high side, you'll need to create a floating supply in order to stay within the input common mode voltage range of the AMC1100. 

  • 0 in reply to Jason Bridgmon
    TI__Intellectual 2550 points

    This would be 120V  AC.

    I am going to review the AMC1100 and see if it will perform well for what we are trying to do! Will get back to you!