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:
Nov. 30, 2010
Filed:
Nov. 09, 2007
Morihito Hasegawa, Kasugai, JP;
Takashi Matsumoto, Kasugai, JP;
Ryuta Nagai, Kasugai, JP;
Fujitsu Semiconductor Limited, Yokohama, JP;
Abstract
To provide a control circuit for a synchronous rectifier-type DC-DC converter, a synchronous rectifier-type DC-DC converter and a control method thereof in which, in a light load state and a no-load state, an output voltage can be dropped to thus prevent an overshoot state from continuing. A synchronous rectifier-type DC-DC converterand a control circuitA thereof comprising a first switching element FETthat is made conductive when power is accumulated in an induction element L, and a second switching element FETthat is made conductive when power accumulated in induction element Lis supplied to a load, also comprises a detecting unit COMPthat detects that a value of an output voltage VOUT of the synchronous rectifier-type DC-DC converterA is a predetermined voltage value that is higher than a target voltage value, and control units COMPand ORthat maintain the second switching element FETin a conductive state after discharge of the power accumulated in the induction element Lis finished, based on the detection results of the detecting unit COMP