Ytai, have you come up with a solution to the problem, that might be rolled into a new version of IOIO? I might be building a board which integrates IOIO with some other stuff, and wonder if you found some solutions to this issue, which don't restrict Vin or cable length. thanks
On Monday, October 21, 2013 at 8:30:27 PM UTC-4, Ytai wrote: > > If you're using 10V or less you can have the wires be as long as you want. > If you're using *more* than 10V I'd be careful about wire lengths. I can > give exact numbers, since they highly depend on the specific power supply > that you're using: how fast it ramps up, how much current it can source > during ramp-up, etc. > > In practice, I've been using 12V, 2A wall adapters for a long time with a > 1-meter long wire with no problem. LiPo batteries (3S-4S over long wires > may be more of a problem. > On Oct 21, 2013 1:47 PM, "kolbe" <[email protected] <javascript:>> wrote: > >> Ytai, >> >> Could you enter into more detail if possible? >> >> Under 10V, OK... but any input on power cord lengths? Say with 9V how >> long can the cord be without risking damage. >> >> Is there still a risk at lower voltages say 7.5V or 6V? >> >> Does this problem exist for modern switching supplies? >> >> The safest bet I guess is to just bypass the regulator and supply 5V to >> the board. >> >> Maybe put this info as a sticky post. >> >> >> On Monday, September 16, 2013 4:28:34 AM UTC+2, Ytai wrote: >>> >>> Hey folks, >>> >>> As some of you have noticed, we've had some recurring problems with the >>> DC/DC regulator on the board getting fried during what appears to be normal >>> usage. >>> >>> With some help from my friends in Shenzhen, we now believe we understand >>> the root cause of this issue. It has to do with the combination of large >>> bulk capacitance with low ESR on the power input of the board and >>> inductance of wires coming from your power supply. The net effect is that >>> when connecting power to the IOIO, the input voltage may briefly jump to >>> about twice its nominal value, exceeding the input voltage rating on the >>> voltage regulator (which is 20V). >>> >>> We are now working on a permanent fix, which is likely to require a >>> board revision. >>> In the meantime, you can protect your board by: >>> >>> - Try to use a lower voltage on the input, ideally 10V or less. >>> - If that is not an option, use wires that are as short as possible >>> between your supply and the IOIO. Also, if you have an option to "soft >>> start" the power supply (ramping the voltage over the course of a >>> millisecond or so), do so. >>> >>> Sorry about that. Will update when I have some news about a fix. >>> >>> Ytai >>> >>> -- >> You received this message because you are subscribed to the Google Groups >> "ioio-users" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> To post to this group, send email to [email protected] >> <javascript:>. >> Visit this group at http://groups.google.com/group/ioio-users. >> For more options, visit https://groups.google.com/groups/opt_out. >> > -- You received this message because you are subscribed to the Google Groups "ioio-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/ioio-users. For more options, visit https://groups.google.com/d/optout.
