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:
Jul. 23, 2013
Filed:
Mar. 21, 2012
Zhiye Zhang, San Jose, CA (US);
Zhiye Zhang, San Jose, CA (US);
Alpha and Omega Semiconductor Incorporated, Sunnyvale, CA (US);
Abstract
A control circuit for a switching regulator implements constant on-time control scheme with synchronous rectification and applies an integrated standard and light load control loop to improve light load efficiency and enhance transient response. In one embodiment, the control circuit includes a reference voltage selection circuit configured to select, based on a low-side current signal, a first reference voltage for standard load condition and a second reference voltage for light load condition as a selected reference voltage. The second reference voltage is greater than the first reference voltage. The control circuit further includes a control loop configured to generate a control signal to turn on the main switch when the feedback voltage is below the selected reference voltage and the minimum off-time duration has expired.