Will NRF52840 USB VBUS supply back feed

[wel]

Hi,

Could I get clarification on if the USB peripheral is isolated and won't backfeed?

In my product, VDDH & VDD are powered via a DC adapter that can be unplugged while the USB is left connected powering VBUS.

DC Adapter -> VDDH / VDD

USB Cable -> VBUS

Regards,

Jonathan

[Jared]

Hi,

So i'm not sure if you're asking whether the current will flow in reverse direction from the peripheral or if the VBUS will generate a 5V without being powered. The answer is nevertheless no to both. 

Let me know if this was not what you were asking about

regards

Jared

[ctchong]

Which circuit configuration are you using ? is it no.5 ? I seem to be experiencing back feed when I have USB supply to VBUS.