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INA237: Vshunt error

Part Number: INA237


Tool/software:

 in our design,IN237 use for two optional bus V/I/P monitor,see as below figure

48VBUS is floating ,monitor 12VBUS current ,but there is a big monitor error(monitor 2.5A,actual 3.8A) due to 48VBUS Rshunt circuit (2mohm/10R /10R ),remove those part can cancel this error

I want to root cause this issue so i need more detail for INA237's differential current sense architecture ,could you help ?or could you help to explain

  • there's a wrong connect in up figure

    root cause is that 10R/2mohm/10R flow a small current iL,then INA237  Vshunt  monitor=iactual*1mohm-iL*20ohm,monitor current error happen