Output inductor voltage regulation

摘要

A power supply system and method are disclosed. The system includes a switching stage to provide an output current through an output inductor in response to a switching signal having a substantially fixed duty-cycle. The system also includes a load monitor to monitor a load of the power supply system. The system further includes a gate drive controller to generate the switching signal and to change operation of the switching stage from a normal operating mode to a light-load operating mode in response to the load being less than a predetermined threshold to substantially minimize a voltage across the output inductor in the light-load operating mode.

主权项

1. A power supply system comprising:
a switching stage to provide an output current through an output inductor in response to a switching signal having a substantially fixed duty-cycle; a load monitor to monitor a load of the power supply system; and a gate drive controller to generate the switching signal and to change operation of the switching stage from a normal operating mode to a light-load operating mode in response to the load being less than a predetermined threshold to substantially-minimize a voltage across the output inductor in the light-load operating mode, wherein the predetermined threshold comprises a first predetermined threshold and a second predetermined threshold, the second predetermined threshold being less than the first predetermined threshold, and wherein the gate drive controller is to change operation of the switching stage to decrease the voltage across the output inductor by a first magnitude in response to the load being less than the first predetermined threshold and to decrease the voltage across the output inductor by a second magnitude in response to the load being less than the second predetermined threshold.