Patent ID: 6670794
Filing Date: 2003-12-30
Classification: H02M

Abstract:
A multi-phase DC-to-DC buck converter for transforming a supply voltage to a converter output voltage by splitting an input current to a plurality of channel currents, said converter comprising:a voltage sense circuit for sensing said converter output voltage and generating a first sense signal; a plurality of current sense circuits each for sensing a respective one of said plurality of channel currents and generating a respective second sense signal; an error amplifier for comparing said first sense signal with a reference signal and generating a first error signal serving as a first control signal; a first summing circuit for summing said plurality of second sense signals and generating a summed signal; an averaging circuit for averaging said summed signal and generating an average signal; a plurality of subtracting circuits each for subtracting said average signal from one of said plurality of second sense signals and generating a respective second error signal; a plurality of second summing circuits each for adding one of said plurality of second error signals to a respective ramp signal and generating a respective second control signal; and a plurality of PWM comparators each for receiving said first control signal and one of plurality of second control signals and generating a PWM signal for regulating said channel current of said corresponding channel.