# Connecting the grounds on a non-isolated DC/DC converter

For isolated DC/DC converters, I know that it's a good idea to have two different grounds on both sides and that we should avoid to connect the two grounds together as the isolation is useless when they are connected. But what about non-isolated DC/DC converters ?

I want to know if it's a good idea to connect both sides of the converter to GND (circuit A), or if I should only connect one side to GND and connect the other side like if -VOUT was a GND (circuit B)

simulate this circuit – Schematic created using CircuitLab

• there's no reason to do that, and it could cause problems. May 10, 2022 at 20:34