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:
Jan. 24, 2017
Filed:
May. 11, 2012
Nobukazu Tsukiji, Kyoto, JP;
Kazuhiro Murakami, Kyoto, JP;
Masashi Nagasato, Kyoto, JP;
Tadashi Akaho, Kyoto, JP;
Nobukazu Tsukiji, Kyoto, JP;
Kazuhiro Murakami, Kyoto, JP;
Masashi Nagasato, Kyoto, JP;
Tadashi Akaho, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
A high-side variable current source and a high-side transistor are provided in series between a supply power terminal of a control circuit and a gate of a switching transistor. A low-side variable current source and a low-side transistor are provided in series between the gate of the switching transistor and a ground terminal. A slew rate controller controls the current value of at least one of the high-side and low-side variable current sources according to the state of a setting terminal. A switching power supply device has a plurality of output transistors connected in parallel with one another and a controller that generates control signals turning on and off the output transistors at a predetermined frequency so as to generate a desired output voltage from an input voltage and supply the output voltage to a load. The controller determines which output transistor to drive according to the magnitude of the load.