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:
Jul. 23, 2013
Filed:
Apr. 20, 2011
Junichi Hagino, Kyoto, JP;
Shingo Haruta, Kyoto, JP;
Junichi Hagino, Kyoto, JP;
Shingo Haruta, Kyoto, JP;
Rohm Co., Ltd., , JP;
Abstract
A pulse width modulated dimming pulse signal PWM is input to a control input terminal P. A standby terminal Preceives a standby signal STB that indicates switching between a standby state and an operating state of a current drive circuit. A burst dimming terminal BS is provided to each of eight respective channels. Each burst dimming terminal BS receives a voltage at one terminal (cathode) of a corresponding LED string. When the voltage level of the standby signal STB is included in a first voltage range, a burst controlleris set to an all channel common mode, and when it is included in a second voltage range, the mode is set to a phase shift mode φ. The burst controllerset to the phase shift mode φautomatically sets the phase shift angle according to the number of connected LED strings