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. 03, 2015
Filed:
Sep. 24, 2013
Rohm Co., Ltd., Ukyo-Ku, Kyoto, JP;
Hiroki Kikuchi, Kyoto, JP;
Masao Yonemaru, Kyoto, JP;
ROHM CO., LTD., , JP;
Abstract
A current driving circuit is connected to an LED terminal LED, and generates an intermittent driving current Ithat corresponds to a dimming pulse signal PWM. An error amplifier generates a feedback voltage Vthat corresponds to the difference between a detection voltage Vand a predetermined reference voltage V. A pulse modulator generates a pulse signal having a duty ratio that corresponds to the feedback voltage V. A fault detection comparator COMP_OPENgenerates a fault detection signal OPEN_DET which is asserted when the detection voltage Vis lower than a predetermined threshold voltage V. A forced turn-off circuit instructs the current driving circuit to suspend the generation of the driving current Iduring a predetermined period after a switching power supply starts to operate. The fault detection circuit detects whether or not the fault detection signal OPEN_DEThas been asserted in a predetermined period.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile