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:
Feb. 21, 2012
Filed:
Feb. 19, 2009
Noboru Akiyama, Hitachinaka, JP;
Takayuki Hashimoto, Tokai, JP;
Takashi Hirao, Hitachi, JP;
Koji Tateno, Takasaki, JP;
Takuya Ishigaki, Hitachinaka, JP;
Noboru Akiyama, Hitachinaka, JP;
Takayuki Hashimoto, Tokai, JP;
Takashi Hirao, Hitachi, JP;
Koji Tateno, Takasaki, JP;
Takuya Ishigaki, Hitachinaka, JP;
Renesas Electronics Corporation, Kanagawa, JP;
Abstract
A semiconductor device for control applied to a constant-voltage power supply device includes a digital-analog converter circuit which outputs a reference voltage corresponding to a value of a first register with taking an output voltage of a reference voltage source as a criterial reference voltage, and generates a control signal for driving a power semiconductor device based on an output voltage of an error amplifier which differentially amplifies a feedback voltage obtained by resistive-dividing on an output voltage of the constant-voltage power supply device and the reference voltage. An analog-digital converter circuit which converts the feedback voltage to a digital value with taking the output voltage of the constant-voltage power supply device as a reference voltage is provided, and based on the output, a value of a first register is corrected so as to offset an effect of an error in voltage dividing ratio of a voltage dividing resistor circuit.