Quote Originally Posted by jtar40 View Post
Ivolts of course must be lower than the max voltage allowed(less than 5 volts in my case)
Voltage for the UC300ETH should be 5V - don't go lower.

Current draw is whatever the board draws - obviously specified at 500mA, so spec for at least that - it doesn't matter much if the PSU is substantially higher than this provided that it's regulated.

Power is a function of voltage and current. P=V*I, where I is the drawn current. So, the power supply should be rated at 5V * 0.5A (=500mA) = 2.5W - as a minimum.