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. 12, 2013
Filed:
Aug. 01, 2007
Kenichi Niiyama, Kyoto, JP;
Kenichi Niiyama, Kyoto, JP;
Rohm Co., Ltd., , JP;
Abstract
A load driving circuit includes a first transistor and a second transistor that are bipolar transistors connected in series between a first fixed voltage (Vdd) and a second fixed voltage (GND), and supplies a drive current, according to ON-OFF states of the two transistors, to a load connected to an output terminal that is a connection point of the two transistors. A current source controls a base current supplying the first transistor. A protection circuit compares output voltage of the output terminal with a predetermined threshold voltage, and additionally monitors ON and OFF states of the first transistor. In a state in which Vout<Vth, and the first transistor is ON, the protection circuit reduces the base current of the first transistor.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile