Search found 5 matches

by Rickster
Wed Aug 17, 2016 1:07 pm
Forum: General Discussion
Topic: Solar panel charger with auto shutoff. Solar LED drivers.
Replies: 54
Views: 129706

Re: Solar panel charger with auto shutoff. Solar LED drivers.

I found a way to utilize the 5252 in some very useful ways. Utilizing a Schottky diode, and capacitor, you can use the device as a significant voltage booster. I was able to get 7V out of a single AA cell.. Combine this with a low quiescent current, low dropout regulator (like MCP1702-5V) and you ca...
by Rickster
Wed Aug 17, 2016 9:54 am
Forum: General Discussion
Topic: Solar panel charger with auto shutoff. Solar LED drivers.
Replies: 54
Views: 129706

Re: Solar panel charger with auto shutoff. Solar LED drivers.

After testing, I determined that it does not use simple hysteresis to prevent flickering - which may prevent me from using it for what I had hoped. Once it shuts down because voltage goes below ~1.0V, the solar cells must be exposed to light to reset the low battery condition - if the battery has be...
by Rickster
Mon Aug 08, 2016 2:44 pm
Forum: General Discussion
Topic: Solar panel charger with auto shutoff. Solar LED drivers.
Replies: 54
Views: 129706

Re: Solar panel charger with auto shutoff. Solar LED drivers.

Thanks. After it shuts off at 0.9V, how much does the battery need to charge to before the chip will power back up and light the LEDs? I can't find it in the specs, but I suspect the "on" voltage is a bit higher (say 1.0V) than the 0.9V "off/shutdown" voltage. I.e. I'm figuring the "ain't-flicker" f...
by Rickster
Mon Aug 08, 2016 10:41 am
Forum: General Discussion
Topic: Solar panel charger with auto shutoff. Solar LED drivers.
Replies: 54
Views: 129706

Re: Solar panel charger with auto shutoff. Solar LED drivers.

5252F

Does anyone know the minimum operating voltage?

Given the claimed "flicker free" shutdown, I figure there must be built in hysteresis.

Has anyone tested the actual "on voltage", "off", and "back on"?

~ Rick
by Rickster
Mon Aug 08, 2016 10:38 am
Forum: General Discussion
Topic: Solar panel charger with auto shutoff. Solar LED drivers.
Replies: 54
Views: 129706

Re: Solar panel charger with auto shutoff. Solar LED drivers.

>>the two biggest problems were the AC prongs. which were really hard to solder to. I ended up wrapping solid wire around the prongs on the top and bottom of the board and soldering the circuit to that. The prongs moved. When soldering things line AC plug prongs - that have to keep alignment, and te...