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:
Oct. 06, 2009
Filed:
Apr. 04, 2007
Applicants:
George A. Hariman, Sunnyvale, CA (US);
Faruk Jose Nome Silva, Sunnyvale, CA (US);
Inventors:
George A. Hariman, Sunnyvale, CA (US);
Faruk Jose Nome Silva, Sunnyvale, CA (US);
Assignee:
National Semiconductor Corporation, Santa Clara, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G05F 1/59 (2006.01);
U.S. Cl.
CPC ...
Abstract
A synchronous switching voltage regulator circuit is provided. After the first PWM pulse or at the end of a soft-start, a gradual transition is made from asynchronous rectification to fully synchronous rectification, or vice versa. During the gradual transition, the error voltage is level-shifted down to correct for error caused by reverse current through the body diode of the main switch.