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:
Sep. 07, 2004
Filed:
Jan. 29, 2003
Robert Henry Bell, Chandler, AZ (US);
Steven Michael Barrow, Gilbert, AZ (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A pulse frequency modulation switching regulator varies the forced off-time of a load circuit when the load circuit is subject to an overload or short circuit event. An on-switch of the circuit is deactivated for a variable time interval when an output current of the load circuit exceeds a threshold. The time interval that the on-switch is deactivated is dependent on an output voltage of the load circuit. The on-switch is deactivated for a short time interval when the load circuit is subject to a slight overload. The on-switch is deactivated for a long time interval when the load circuit is subject to a short circuit.