FemtoBuck Constant Current LED Driver Hookup Guide V12

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Further Increasing Current Drive Strength

If even 660mA isn't enough current for you, it is possible to increase the maximum current of the FemtoBuck board up to 1A per channel. To do so, replace the current sense resistors with smaller values. To calculate the new value for the resistor, use this formula:

ILED = 0.1 / Rset


Thus, for a 1A current, you'd want a 0.1Ω resistor. Don't forget to be wary of current ratings; at 1A, the sense resistor will be dissipating 1/10W, so you probably want a resistor of at least 1/8W rating. The package is a standard 0805.