Kelvin connections for Sense resistor | Cypress Semiconductor
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Kelvin connections for Sense resistor
Why use Kelvin connections for Sense resistor?
We use Kelvin connections at the Sense resistor to minimize any additional resistance added by copper connections power to sense resistor and sense resistor to the LED load. At low current, the error is minimal due to additional voltage added to the voltage across the Sense resistor. As current increases, the voltage drop increases across that small piece of copper inside the Kelvin current sense connections. The increase in voltage will cause current measurement errors.