Does our device integrate the RC snubber at gate driver pin? If not, do we need to add the snubber circuit at the pin?
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The DRV8305-Q1 does not have an RC snubber for the phase lines integrated.
You do not need to put a snubber but some users have it just in case there are spikes that present after building the PCB. As such, you can leave placeholder RC footprints, see if there performance is bad, and then populate the components to create the snubbers. Note, some users don't use snubber and just have the capacitors, add gate resistors, add CGS caps, or reduce the gate current because of space constraints, cost, or other factors.
I can't give you advice whether you should add snubbers or not but I will say the safest option is to put footprints, and then remove them in the next generation or add them in if they're necessary.
If you need help creating the snubber please visit the EVM post below, which assumes the board has been built as PCB parasitics will affect the spikes seen at the output.