Analog Discovery AD2 External PSU power supply issue

[sib]

Hi Allita 

My Analog Discovery AD2 crashes waveforms when I plug in a external +5V psu.

My PSU has cable has the deminsions 5V DC voltage supply with at least 3A max current, 
Outer diameter 5.5 mm  and inner pin 2.1mm diameter 
positive inner pin = 5v
Outer case =0 V

DC plug connected up as shown the in above photo.

This solutions complies to the hand book rules here 

https://reference.digilentinc.com/reference/instrumentation/analog-discovery-2/reference-manual

Normally my Analog Discovery AD2 when just powered by the USB cable works fine without any issues.

Any ideas of how to fix the issue  ??

Best wishes

Simon

[sib]

Hi Allita  

I found the solution myself .  

As a user you need to change a setting in the Waveforms program to fix the issue 

from 

to 

 

 

This solves the issue 

Best wishes

SImon

[sib]

Also additionally as a user you have to make this setup change each time you start the waveforms environment before selecting the Analogue discovery device setup you wish to use.

[attila]

Hi @sib

Probably your 5V supply is not well regulated, voltage fluctuates too much.

The auxiliary power supply line has a protection circuit.
https://reference.digilentinc.com/reference/instrumentation/analog-discovery-2/reference-manual#power_supplies_and_control
When auxiliary supply is detected and the option for USB is to 'Stop with AUX', the USB supply is stopped.
In case the aux voltage gets out of 4.11V and 5.76V range the auxiliary supply is stopped. Having the USB also stopped the device will remain unpowered.