In a multi-phase buck converter, when and how does the inductor breakdown?
Lets say the multi-phase buck converter has the following parameters:
V_in = 50V, V_out = 25V, P_in = 225W (so max amps = 225V/15V = 15A), R_load = 1 Ohm, Switching_frequency_per_phase = 62500Hz and the converter is 4 phases (lets call them phase A, B, C and D respectively)
Inductor wire is rated at 15A current and the saturation current rating is also rated at 15A.
When the phase A first turns on (phase B is off) the current going through the inductor will be (50V-25)/1Ohm = 25A. Will this current breakdown the inductor? Keep in mind that when the phase B turns on, the inductors on phase B will start drawing the rest of the current and so both inductors will have 25A/2 = 12.5A which the inductors can handle.