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:
Aug. 15, 2017
Filed:
Oct. 16, 2015
Rohm Co., Ltd., Kyoto, JP;
Manabu Oyama, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
A control circuit is used in a switching converter including at least, a switching transistor and a coil connected to the switching transistor. The control circuit includes: a current comparing circuit that asserts a peak current sensing signal when a current flowing in the coil during the ON period of the switching transistor reaches a threshold current. The current comparing circuit includes: a first comparator that compares a sensed voltage according to the current flowing in the switching transistor and the coil with a threshold voltage defining the threshold current, and generates a comparison signal; and a variable delay circuit that generates the peak current sensing signal by delaying the comparison signal, a delay amount of the variable delay circuit varying according to a period of time from a turn-on of the switching transistor to a transition of the comparison signal.