SMPS WITH ADAPTIVE COT CONTROL AND METHOD THEREOF

摘要

A SMPS has a switching circuit and a controller. The switching circuit has an input terminal and an output terminal, and also includes a switch and an inductor, wherein the switching circuit regulates an output voltage at the output terminal based on an input voltage at the input terminal by controlling a switching action of the switch. The controller generates a switching control signal to control the switch, where the switching control signal transits from a first state to a second state when an output signal at the output terminal satisfies a predetermined condition, and the switching control signal transits from the second state to the first state after a period of time. And a switching frequency of the switch and an inductor ripple current of the inductor both vary with the input voltage.

主权项

1. A Switching Mode Power Supply (SMPS), comprising:
a switching circuit having an input terminal and an output terminal, the switching circuit comprising a switch and an inductor, wherein the switching circuit regulates an output voltage at the output terminal based on an input voltage at the input terminal by controlling a switching action of the switch; and a controller configured to generate a switching control signal to control the switch, wherein the switching control signal transits from a first state to a second state when an output signal at the output terminal satisfies a predetermined condition, and the switching control signal transits from the second state to the first state after a period of time; wherein a switching frequency of the switch and an inductor ripple current of the inductor are both configured to vary with the input voltage.