Hi guys,
this widely available LTC3780 board (hope photo appears somewhere below) is quite nice for all kinds of voltage and current sources.
Being an step up/down it provides CV and CC from almost any input voltage.
Alas, as often with these cheap chinese boards, it has at least one flaw: the input undervoltage protection has no hysteresis and apparently no lowpass. Making it overly sensitive - when you want to use that feature.
I fiddled in some positive feedback to the comparator, so it gets a hysteresis, what works quite well.
But still the thing is too sensitive and tends to get unstable.
HAS ANYONE SEEN A CIRCUIT DIAGRAM of this board? Would help a lot debugging. Maybe some components are wrong, would not be first time on such boards.