I used a similar wall switcher 1.5A usb power supply, and found that it was fine to power via the mini usb socket, but when used for Vdd_5v it would fail to deliver enough power during boot. I'm not sure, but it seems the power management of the BBB allows it to draw a lot more current (for short spikes) form the Vdd_5v than from the USB. In either case, it draws under 400mA once booted, it's just some instantaneous power demands during boot that cause reset. --Karl
On Mon, Mar 23, 2015 at 12:20 PM, José Luis Redrejo <jredr...@gmail.com> wrote: > Thanks, I will try it. I am working with a Chinese mobile phone charger > without problem, but I'd prefer to integrate the power supply in my own > circuit. > > José L. > > 2015-03-23 18:46 GMT+01:00 Karl Walter <n81...@gmail.com>: > >> >> >> On Monday, December 23, 2013 at 12:30:32 PM UTC-8, José Luis Redrejo >> wrote: >>> >>> I've made a power supply to power my BBB, but whenever I connect it >>> (to pins 5 & 1 of P9 connector for VDD & GND), the power led blinks >>> for some seconds and then it is off. >>> >>> The output comes from a 7805CKCT, which can provide up to 1.5A. >>> >>> It's a typical power supply from a rectifier + capacitors + regulator. >>> >>> What does this "blinking" mean? any ideas of what is going wrong? >>> >>> Regards >>> José L. >>> >>> >> This is an old thread, but I thought I'd add a solution. I found that the >> BBB would reset part way through booting when powering the BBB via the >> barrel connector or Vdd_5v pins. I needed to add a large capacitor. 10,000 >> uf did the job. >> > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
