I’m concerned that the device snubber resistor (Rs) get too hot? Can you please provide some insights?
It depends on the Rs loss. We showed that the measured Rs loss is 6 times less than conventional estimation. For applications with fsw under 100kHz we can use 2 resistors in parallel or simply reduce Rs to help relieve thermal stress. In the user guide, we have provided snubber resistor loss in one switching cycle for some of the devices. The loss of power can be easily calculated by multiplying switching frequency.
It is true that SMD resistors are no longer available when switching over 1MHz. For such high switching frequency application, optimizing PCB layout and parasitic inductances & capacitances is more reasonable.