Everyone,
I'm interested in using some kind of "supercapacitor" (e.g. double layer capacitor) as a power backup on a 5V supply which may sometimes be intermittent (can go down for short times upto 500ms). Many of these are rated for 5.5V. How close to this limit is it safe to operate them?
5V seems uncomfortably close to me, considering that the actual value may be something like 4.75..5.25 V.I know with traditional aluminium electrolytics it's best to stay far away from the voltage rating to significantly improve lifetime. Does this advice extend to the dual layer types?
If so, I will need to put two in series (halving my capacitance), so it may become more economical to use a small battery for backup instead...
greetings, Tom