Switching regulator with adjustable on-time

Abstract

A switching converter with adjustable on-time is presented. The switching converter includes an inductor coupled to a power switch; a pulse generator generating a pulsed signal to switch the power switch and a controller. The pulsed signal has an on-time adjustable between a first value and a second value, the first value being shorter than the second value. The controller identifies a mode of operation between a continuous conduction mode and a discontinuous conduction mode and sets the on-time to the second value when a continuous conduction mode is identified. The controller also measures a duration between successive inductor current pulses, compares the duration with a first threshold value and maintains the on-time to the second value as long as the duration is less than the first threshold value. When the duration increases above the first threshold value the controller sets the on-time to the first value.

Dependencies are inferred from the claim text.