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LT3476 current calculation from Rsense

Perhaps I missed it on the datasheet, but how exactly do you calculate the current to the LED from adjusting the value of Rsense? I do not see an equation. I assume that Rsense just sets the max/full scale current and making it smaller increases the max but also increases error as well?

  • Hi 

    The equation is Imax = Vadj / Rsns where Vadj is set from 10mV to 120mV using external voltage divider. This is discussed further on page 9 of the datasheet.

    Accuracy of current would be determined by the PCB layout,  Rsns and controller error which is guarantied to be 2.5% at the full scale of 105mV

    Regards,