Patent ID: 6462521
Filing Date: 2002-10-08
Classification: H02M

Abstract:
An N-phase controller for a switched-mode power converter, N being an integer of 1 or greater, said controller comprising associated with a first phase:a current mirror circuit providing N separate current signals proportional to a total current I used by the converter, said N signals respectively comprising a current proportional to I/n for n=1 to N; a current level decoder coupled to a source of an ON/OFF control signal for each of said N phases, said current level decoder providing a signal indicating a number, K, of phases currently ON; a current selector coupled to said current level decoder and to said current mirror circuit, said current selector having an output proportional to I/K; and a charge ramp circuit coupled to said current selector and integrating a signal from said output of said current selector while said first phase is ON.