Patent ID: 9467051
Filing Date: 2016-10-11
CPC Classification: H02M

Claim Text:
1. A switching regulator being configured to receiving an input voltage and to generate a regulated output voltage, the switching regulator controlling a high-side switch and a low-side switch based on a feedback control scheme to drive a switch output node for generating a switching output voltage, the switch output node being coupled to an LC filter to generate the regulated output voltage having a substantially constant magnitude on an output node, the switching regulator comprising: a current mode feedback control circuit configured to generate a control signal to turn on or off the high-side switch and the low-side switch in response to a first signal indicative of the difference between a feedback voltage indicative of the output voltage and a first reference signal and in response to a second signal indicative of a sensed current of an inductor of the LC filter, the current mode feedback control circuit further configured to generate a current loop error signal based on the first signal and a second reference signal, the current loop error signal being indicative of a requested inductor current value as a function of the first signal; a slope compensation circuit configured to provide a slope compensation signal as a function of the input voltage and the output voltage and for a given range of duty cycle values, the slope compensation signal being provided to the current mode feedback control circuit; and a DC offset correction circuit configured to generate a DC offset correction signal having a signal value being a function of the input voltage and the output voltage, the DC offset correction signal being provided to the current mode feedback control circuit to be added to a subtracted signal being the current loop error signal subtracted from the second signal, wherein the DC offset correction signal is applied in response to the slope compensation signal being applied and has a magnitude selected to cancel a DC offset error introduced by the slope compensation signal at the regulated output voltage.