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Selecting a current sense resistor for the PowerPSoC
Question: How do I select a current sense resistor for the PowerPSoC?
The best current sense resistor value is determined by dividing 0.1V by the nominal average current through the LED string. 0.1V provides sufficient magnitude across the current sense resistor to minimize the effect of system level noise. An example is 0.1V divided by a nominal LED string current of 350mA indicates a current sense resistor of 285.7 milliohms. A standard 1% resistor value close to 285.7 is 280 or 287.