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. 21, 2006
Filed:
Nov. 28, 2005
Takuya Ishigaki, Hitachi, JP;
Takashi Sase, Hitachi, JP;
Akihiko Kanouda, Hitachinaka, JP;
Koji Tateno, Takasaki, JP;
Ryotaro Kudo, Takasaki, JP;
Takuya Ishigaki, Hitachi, JP;
Takashi Sase, Hitachi, JP;
Akihiko Kanouda, Hitachinaka, JP;
Koji Tateno, Takasaki, JP;
Ryotaro Kudo, Takasaki, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
A power supply driver circuit with low power losses and desired response characteristics with respect to changes in output and its miniaturization is provided. In a driver IC constituting a switched-mode power supply equipment controlling the switching, by pulse width modulation, of first and second power transistors passing a current in a coil, and outputting a voltage bucked or boosted from an input voltage, current sensing with desired responsiveness is enabled by providing a switching transistor between an inverted input terminal and a non-inverted input terminal of an operational amplifier, preventing, while the second power transistor is ON, the generation of a potential which is undefined when first power transistor is ON, i.e. when the second power transistor is OFF, and maintaining a node potential in a state in which the potential is well defined.