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. 08, 2016
Filed:
Jun. 01, 2011
Applicants:
Xuelin Wu, Plano, TX (US);
Xiping Yang, Plano, TX (US);
Congzhong Huang, Plano, TX (US);
Inventors:
Assignee:
Intersil Americas LLC, Milpitas, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 37/02 (2006.01); H05B 33/08 (2006.01);
U.S. Cl.
CPC ...
H05B 33/0827 (2013.01); H05B 33/0815 (2013.01); H05B 33/0839 (2013.01); H05B 33/0851 (2013.01); H05B 33/0887 (2013.01);
Abstract
A multi-channel LED driver includes a plurality of linear current regulators, each connected to a bottom of a string of series connected LEDs of a multi-channel LED that controls a bias current and the string of series connected LEDs responsive to an LED bias reference voltage. A dynamic headroom regulation voltage control circuit monitors the headroom regulation voltage at the bottom of each string of the series connected LEDs in the multi-channel LED and generates a reference voltage controlling each of the headroom regulation voltages responsive to the LED bias reference voltage.