I've never encountered this problem. When this happens, what happens if you don't power-cycle, but rather disconnect and reconnect USB?
On Mon, Jan 12, 2015 at 9:12 PM, Andries Kruger <[email protected]> wrote: > Thanks for the reply, I'll make use of an external regulator then for the > time being. > > One more thing: I've been using a 12V DC power supply for the IOIO. A lot > of the times when I turn the power supply on, the IOIO powers up but does > not charge the phone or power a Bluetooth dongle, I then have to remove the > crocodile clip that powers the device and put it back before it powers the > phone or dongle. I'm thinking it is my power supply that is a bit shaky. > Any idea what might be causing this and how I can prevent it. > > On Monday, 12 January 2015 19:32:54 UTC+2, Ytai wrote: >> >> The issue is still under investigation. If you're curious, here's the >> thread I've been keeping with TI engineers to try to resolve it: >> http://e2e.ti.com/support/power_management/non-isolated_ >> dcdc/f/196/p/390774/1379558#1379558. The issue is now believe to be more >> associated with load (output) switching rather than line (input) switching >> and has only even been observed with 12V or above. >> A Zener or TVS would not help you here (you don't have enough margin). >> The next revision of the IOIO, as soon as this issue is resolved, will >> contain a simple protection circuit comprising a Zener and a FET that >> protects the voltage surges. However, this is known to be insufficient >> (because the failure had been observed with this circuit in place, while >> monitoring Vin and asserting that it has not exceeded the maximum ratings). >> One thing that you can probably do in the near term if you have to use >> 12V input is step-down the 12V to, say, 9V using an external regulator that >> is more robust. >> >> On Mon, Jan 12, 2015 at 6:57 AM, Andries Kruger <[email protected]> >> wrote: >> >>> Hi all, >>> >>> So my VREG finally fried today. It might have been one of two things >>> that fired the VREG: >>> 1) Might have happened when I plugged in my phone >>> 2) Was using a new power supply and might have happened when I powered >>> on the supply. >>> >>> For my applications, I will need to be running from a 12V power supply. >>> I know the IOIO isn't great with anything more than 10V but I have no >>> choice. I have ordered a new VREG and will hopefully be replacing this one >>> in a week or so. >>> >>> My questions are: >>> 1) Can I protect my IOIO with a Zener diode or TVS over Vin? >>> 2) If this is possible, does anyone know of a nice TVS or Zener with the >>> best possible spec to do this? >>> >>> Thanks. >>> >>> -- >>> 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. >>> >> >> -- > 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. > -- 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.
