I have 2560 mega, and I Want to generate 3-phase PWM signal at 62.5khz, synced and shifted 120 degrees apart.

I need that for 3-phase split-coil boost converter (or even isolated flyback converter), with 3 phase transformer coupled inductor. So I dont need sine wave table like here, but actually, a direct square wave PWM output, from 3 synced digital pins, with chosen duty cycle. How can I do that?