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. 21, 2009
Filed:
Sep. 07, 2007
Jun Yabuzaki, Nagano, JP;
Jun Yabuzaki, Nagano, JP;
Fuji Electronic Device Technology Co., Ltd., Tokyo, JP;
Abstract
In a switching regulator, an inductor L(in FIG.) and an output capacitor Care connected on the output side of a series circuit consisting of a switching element (MOS transistor P) and a synchronous rectification element (MOS transistor N), and an N-channel MOS transistor Qis connected between an intermediate point of the inductor Land one terminal thereof. In addition, the frequency of oscillatorand the turning ON/OFF of MOS transistor Qare controlled by control unit. When output voltage Vout is to be altered, the switching frequency of MOS transistors Pand Nis increased, and the inductance of inductor Lis reduced, whereby a fast output change is permitted. On the other hand, during ordinary constant output voltage operation, the switching frequency is reduced, and the inductance value is increased, whereby high efficiency is attained.