The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 21, 2018
Filed:
Dec. 26, 2017
Alpha and Omega Semiconductor (Cayman) Ltd., Grand Cayman, KY;
Zhiye Zhang, San Jose, CA (US);
Zhinan Wei, San Jose, CA (US);
Alpha and Omega Semiconductor (Cayman) Ltd., Grand Cayman, KY;
Abstract
A control circuit for a switching regulator implementing a fixed frequency constant on-time control scheme incorporates a reference voltage generator to generate a reference voltage ramp that varies over substantially the entire switching period. In one embodiment, the reference voltage increases from an initial voltage value at the start of each switching period towards the end of the switching period and is reset to the initial voltage value at the end of each switching period. The reference voltage ramp ensures stable feedback control operation in the switching regulator without introducing voltage offset for all output voltage values. The control circuit enables the switching regulator to apply constant on-time control scheme while using an output capacitor having any ESR value, including an output capacitor with low or zero ESR.