Multiphase regulator with self-test

摘要

A multiphase regulator includes a plurality of output phases, each operable to deliver a phase current through a separate inductor to a load connected to the output phases via the inductors and an output capacitor. The multiphase regulator further includes a controller operable to regulate a voltage delivered to the load by adjusting the phase currents delivered to the load by the output phases, and monitor the phase currents delivered to the load by the output phases. The controller is further operable to determine if the monitored phase currents indicate any of the individual output phases, any of the individual inductors or the output capacitor are faulty, even if the total current delivered to the load is within specified limits.

主权项

1. A multiphase regulator, comprising:
a plurality of output phases each operable to deliver a phase current through a separate inductor to a load connected to the output phases via the inductors and an output capacitor; and a voltage mode controller operable to regulate a voltage delivered to the load by adjusting the phase currents delivered to the load by the output phases, monitor the phase currents delivered to the load by the output phases, and determine if the monitored phase currents indicate any of the individual output phases, any of the individual inductors or the output capacitor are faulty even if a total current delivered by the multiphase regulator to the load is within specified limits, wherein the voltage mode controller is further operable to determine an allocation of the total load current between one or more active ones of the output phases, adjust the phase currents of each active output phase to match the allocation, and detect if any of the phase currents delivered by the one or more active output phases do not match the allocation for that active output phase, wherein the voltage mode controller is further operable to test if the one or more active output phases react to a known change in the allocation in a predetermined way in a test mode of the multiphase regulator, and detect if the phase currents delivered by the one or more active output phases in the test mode respond to the known change in the allocation by rebalancing the phase currents in the predetermined way.