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When using multiple sense resistors, the Kelvin sensing approach becomes more complicated in that there will be current flowing through each resistor and different voltage drops across each. To achieve the best accuracy, the following rules should be applied: 1) Choose values as close to each other as possible. This ensures that the current flow will be as even as possible in each resistor, 2) Where this is not possible, place the resistor with the intermediate value in the centre and take the Kelvin traces from there ensuring symmetry which helps to get the most accurate result, and 3) In the case of only two sense resistors, the Kelvin traces should be run from points equidistant from the pads as shown.

PTM Published on: 2008-04-29