Patent ID: 8183842

Claim:
A control device for a multi-phase DC-DC converter, the multi-phase DC-DC converter comprising a plurality of converting channels, the control device comprising: an error amplifier for comparing a feedback signal of the multi-phase DC-DC converter and a reference signal to generate a comparison result; a main comparator coupled to the error amplifier for comparing the comparison result and a first sawtooth signal corresponding to a first converting channel of the plurality of converting channels to generate a first pulse width modulation (PWM) signal; and at least one computing module, each computing module corresponding to one of the plurality of converting channels, for generating a PWM signal according to the comparison result, a sawtooth signal corresponding to the converting channel, a sensing signal corresponding to the converting channel, and a sensing signal corresponding to a previous converting channel of the converting channel to control the converting channel; wherein each computing module comprises: a subtracter for subtracting the sensing signal corresponding to the converting channel from the sensing signal corresponding to the previous converting channel to generate a subtracting result; a compensating unit coupled to the subtracter for compensating a gain of the subtracting result according to the subtracting result to generate a compensating result; a computing unit coupled to the compensating unit for adjusting the sawtooth signal corresponding to the converting channel according to the compensating result to generate a computing result; and a parallel comparator coupled to the error amplifier and the computing unit for comparing the comparison result of the error amplifier and the computing result to generate the PWM signal corresponding to the converting channel.