What Neale said... at least peak currents, but the stepper drivers will be generating a low voltage, high current drive to the motor - substantially less voltage than the terminal voltage on the stepper driver. So the *average* power consumed will be significantly less than the worst case above. Amazingly, those linked datasheets don't describe the input power requirement - go figure! At least the DM2282 has an indicative peak current specification on the case - I'd add that to a notionally similar one for the 2283 and 2A for the SMPS, add a fiddle factor of 1.5 to the total and come back and complain when it doesn't work.

Each device is likely to take a surge current on power-up, likely higher than the operating current.