I charge the Switch console just fine with a PD USB-C charger. PD is very negotiable and the Switch only supports a few voltages so your charger must support the same voltages.
As far as I understand it (correct me if I'm wrong), every proper charger is supposed to support the exact same list of power combinations from 0 up to whatever its max wattage is.
The switch dock demands 39 watts, which implies 15 volts, but the switch itself will negotiate any voltage when standalone.
The switch dock demands 39 watts, which implies 15 volts, but the switch itself will negotiate any voltage when standalone.