I think I managed to burn out the TPS65217 on the BBB using a custom cape that I designed. The cape has a DCDC switching regulator that I'm using to drop a 12V supply down to 5V for the beagle bone. I have the 5V from that switching regulator connected to pins P9.6 and P9.5.
I've now had two BBBs fail while powering them from the board. I left both on for a couple of days, and at some point the BBB just died. After that, the BBB don't boot at all, even with the cape unplugged. When I apply 5V from a benchtop supply to P9.6, I only see 1.1V on P9.7 (system 5V). If I hit the power button (S3), then the voltage on P9.7 will jump up to around 2.5V before falling back to 1.1V over around 20s. I'm not sure what's going on here, since the power supply I'm using looks pretty clean to me. It's an average of 5.14V with max 150mVpp noise. It's rated to 2A current draw. Switching frequency is 150kHz. Does anyone have any idea what might be happening here? Any ideas about what I should try next? Thanks, Morgan -- 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.
