The mini-USB power is connected to the BBB power. I can run my BBB just
from the USB cable.
So you probably just paralleled 2 power supplies. The list of outcomes
includes the escape
of the black magic smoke. Some regulators do not like getting started
when there is already
a backward voltage from the load. The LM317 comes to mind. Its data
sheet includes info
on how to make it survive. (Just as an example. it's unlikely that your
laptop contains one.)
Maybe it is a good idea to use a USB port replicator during experiments
with high-priced laptops.
regards,
Gerhard
Am 17.10.2018 um 12:48 schrieb Jaroslav Sykora:
Hello,
We have a problem with a destroyed notebook USB port when it was
connected to BeagleBone Black.
Our system: we designed an extension board connected to the BBB
pin-headers P8 and P9. Let's call this the 'ERTEC board'. The ERTEC
board supplies power to BBB via the connector P9, pins 5, 6, which is
VDD_5V. The VDD_5V rail in BBB is basically the barrel jack input. The
picture below shows the setup:
smoke_from_notebook_usb.png
*Normally the system works fine. *
But now one colleague reported this problem:
1. He had the Mini-USB of BBB connected to a PC (which is
grounded...), and the whole system was powered from a +24V isolated
supply and running.
2. While the system was running, he pulled the USB cable from the PC
and connected it to a USB3.0 port of a notebook.
3. The USB connector of laptop started smoking. The laptop and BBB
didn’t work after that.
Any idea why this could happen? So far it seems like an one-off event,
but one could never know :-/
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