Patent ID: 8030911

Claim:
A hybrid control circuit for providing a plurality of digital PWM signals to control a multiphase DC-DC converter to generate an output voltage, the hybrid control circuit comprising: a current balance controller including: an analog average-current generator for averaging analog phase-current signals of all phases of the multiphase DC-DC converter to generate an analog average-current signal; a first analog error generator connected to the analog average-current generator for comparing each of the analog phase-current signals with the analog average-current signal to generate an analog current error signal for each of the phases; and a first analog-to-digital converter connected to the first analog error generator for converting each of the analog current error signals into a digital current error signal; a voltage controller for monitoring the output voltage to generate a digital voltage error signal; a combiner connected to the current balance controller and the voltage controller for combining each of the digital current error signals with the digital voltage error signal to generate duty control signals for each of the phases; and a digital pulse-width modulator connected to the combiner for calculating duties for each of the phases according to the duty control signals, so as to generate the plurality of digital PWM signals.