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. 08, 2019
Filed:
Jul. 20, 2017
Applicant:
Fairchild Korea Semiconductor Ltd., Bucheon, KR;
Inventors:
Assignee:
SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC, Phoenix, AZ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 37/02 (2006.01); H05B 33/08 (2006.01);
U.S. Cl.
CPC ...
H05B 33/0845 (2013.01); H05B 33/0812 (2013.01); H05B 33/0815 (2013.01); H05B 33/0818 (2013.01);
Abstract
A lighting circuit includes a light emitting diode (LED), a transistor that controls a current through the LED, and a lighting controller integrated circuit (IC) that controls the transistor to vary a brightness of the LED. The controller IC has a dimming pin that receives a dimming signal. The controller IC generates a low reference threshold and a high reference threshold that follow the dimming signal. The lighting controller IC controls the transistor by hysteretic control by comparing a sense signal indicative of the current through the LED to the low reference threshold and the high reference threshold.