Patent ID: 7816901

Claim:
A PWM modulator for generating a PWM control signal for operating transistor switches of a phase of a multi-phase converter comprising: a plurality of ramp generators, each ramp generator receiving a dedicated clock input signal corresponding to a phase of the multi-phase converter and providing a ramp signal starting when the dedicated clock signal is received by the ramp generator, one of the plurality of ramp generators being dedicated to provide said PWM control signal; a plurality of comparators, each comparator associated with a respective ramp generator, each comparator of the plurality of comparators configured for terminating the ramp signal when a predefined inequality exists between an error amplifier output of a feedback loop of the multi-phase converter and an output of the associated ramp generator; a plurality of current generator circuits, each current generator circuit associated with a respective ramp generator for providing current to the one of the ramp generators providing the PWM control signal to control the slope of the ramp signal of the dedicated ramp generator, said dedicated ramp generator controlling its associated comparator to provide said PWM control signal; and a plurality of current generator control circuits for controlling the operation of the plurality of current generator circuits.