Capacitive current-mode control of a DC/DC converter

摘要

Systems and methods for implementing capacitive current-mode control of a voltage regulator or converter, such as a DC/DC buck converter, are provided. An inductor current flowing from an inductive element into a first node of the converter, and, an output current flowing from the first node into an external load coupled to the converter may be determined. The measured output current may be subtracted from the measured inductor current to indirectly determine a capacitor current flowing from the first node into a capacitive element coupled between the first node and ground. The inductor current may then be adjusted based on the indirect measure of the capacitor current. The output current provided to the external load by the converter may be current-limited. The inductor current and the output current may be determined by sensing one or more voltage differentials across discrete or parasitic resistances.

主权项

1. A method, comprising:
identifying a measure of an inductor current flowing into a first node of a converter, the first node being attached to an inductive element; determining a difference amount between the measure of the inductor current and a measure of an output current flowing from the first node to an external load, the external load being attached to an output of the converter, wherein the difference amount indicates a measure of capacitor current flowing from the first node of the converter into a capacitive element coupled between the first node and ground; and adjusting the inductor current flowing into the first node of the converter based on the difference amount.