I have a similar problem, using a "B&K Precision 1550" Lab Bench Power Supply. When you turn on the Output of the supply, the BBB Power Light blinks once and the BeagleBone Black does not boot.
If you put an oscilloscope on the output of the supply and watch it turn on, then the power supply overshoots up to 6 Volts, before returning to the 5 Volt setting. It turns out that the Power Management IC used in the Beaglebone Black will do an over-voltage shutdown at 6 Volts for protection. So, that is why it does one-blink then shuts-off. So, not only do you need a certain rise time, which the B&K power supply meets, but you can not have any large overshoot. No good power supply should have this much overshoot, but the B&K does, so it has problems running a BBB. --- Graham == On Friday, November 14, 2014 4:03:37 AM UTC-6, bremenpl wrote: > > Hello there, > I have a very strange problem with powering up BeagleBone Black (rev > C).... When i try to power it up from some cheap AC adapter it works fine, > but when I connect to to my labolatory power supply the power LED on board > is lid for a second and then doesnt power up the MCU and turns off intead. > I have connected both supplys to osciloscope and they are both stable, the > laboratory one even more. Why is the power controller on the BeagleBone > Black refusing to power up the MCU when powered from lab supply? I have no > idea what is this about. I would aprichiate any help. > -- 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
