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:
Dec. 11, 2007
Filed:
Oct. 03, 2005
Applicants:
Robert Bell, Chandler, AZ (US);
Robert Oppen, Chandler, AZ (US);
Inventors:
Robert Bell, Chandler, AZ (US);
Robert Oppen, Chandler, AZ (US);
Assignee:
National Semiconductor Corporation, Santa Clara, CA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03B 28/00 (2006.01); H03K 3/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A minimum frequency synchronization discriminator for use in providing a clock signal for a switch mode power supply automatically detects when the frequency of a sync signal is above a minimum frequency and causes the sync signal to serve as the clock signal for the controller. If the frequency of the sync signal is below the minimum frequency, the minimum synchronization frequency discriminator causes the output signal of the internal oscillator to serve as the clock signal.