Quote:
Originally Posted by Nath2099
Hi Bojan, the PSU measures 40V with no load, and the buck reg has an input voltage of 60V. Are you saying that there could be an issue here as well? I was monitoring the heat and it seems OK... nothing gave up the magic smoke...
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Probably not in terms of input overvoltage, but regulators are sometimes sweating too much in cases of inpur and/or output transients (
line regulation)... So it is better to keep them at practical minimum.
I would take input voltage for Arduino from more constant voltage source, and use constant current regulator for LEDs only (you sort of did it by using buck regulator).
If you must use the constant current line for whatever reason, a resistive load or Zener diode (as suggested by iborg) is good option...