Using a 3.0K or 3.2K resistor over 3.09K?

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Issue #7 resolved
Jonas Follesø created an issue

The design manual for the LED module specifies a 3.09K resistor to control output voltage. A 3.09K is (as far as I can tell) a non-standard resistor value. I ordered a pack of different values, and it wasn't included. I did find some sites online that sells 3.09K, but I figured I'd check of important/accurate that requirement is.

According to the manual:

RTrim ( ) = (10500/(VOut – 0.7525V)) - 1000 A 1% 3.09K resistor gives approximately 3.32Vdc output.

I got some help from a colleague who said that if you refactor the formula, and use a 3.3K resistor you get 3.2V, while a 3.0K resistor would give 3.38V. How important is it that the output voltage is 3.32V vs say 3.38V?

Is my colleague right in his suggestion to simply use a 3.0K or 3.2K resistor?

Comments (2)

  1. Chad Kecy

    It's not super important; the LED board can operate over a range of voltages. You can even see in some of my drawings that I indicated 3.50 volts going to the power board.

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