Title:
少なくとも第1LEDおよび第2LEDを作動するための回路装置および方法
Document Type and Number:
Japanese Patent JP5389165
Kind Code:
B2
Abstract:
A circuit configuration may include an operational amplifier having a plus and a minus input and an output; and a current sensing resistor, whereby the voltage drop across the resistor is coupled to the minus input; a first transistor having a control electrode, a reference electrode and a working electrode, the working-reference electrode path of which is coupled in series to a first and second connection for a first LED between a connection for a supply voltage and the reference potential; a second transistor having a control electrode, a reference electrode and a working electrode, the working-reference electrode path of which is coupled in series to a first and second connection for a second LED between a connection for a supply voltage and the reference potential; a first switch and a second switch coupled in series between the output and the control electrode of the first and second transistor, respectively.
Inventors:
Ralph Hewing
Application Number:
JP2011515131A
Publication Date:
January 15, 2014
Filing Date:
July 04, 2008
Export Citation:
Assignee:
OSRAM GmbH
International Classes:
H01L33/00; H05B44/00; G09G3/20; G09G3/32; H01L51/50; H05B37/02
Domestic Patent References:
| JP7326796A | ||||
| JP2004311635A | ||||
| JP2006066776A | ||||
| JP2034014A | ||||
| JP2003347594A | ||||
| JP2004253635A | ||||
| JP2007150364A | ||||
| JP200649445A | ||||
| JP2004233714A | ||||
| JP8069577A |
Attorney, Agent or Firm:
Takuya Kuno
Toshio Yano
Takahashi
Kimihiro Hoshi
Hiroyasu Ninomiya
Ryoichi Shino
Einzel Felix-Reinhard
Toshio Yano
Takahashi
Kimihiro Hoshi
Hiroyasu Ninomiya
Ryoichi Shino
Einzel Felix-Reinhard