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Patent Searching and Data


Title:
CURRENT CONTROL CIRCUIT, LED CURRENT CONTROL APPARATUS, AND LIGHT EMITTING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2007/000943
Kind Code:
A1
Abstract:
A counter circuit (6) increments the count value by one in synchronization with a clock pulse received from an oscillating part (4). A lower-order decoder (12) receives a count value from the counter circuit (6) and compares a lower-order bit with a set value (1). Only while the lower-order bit is being coincident with a bit pattern related to the set value (1), the lower-order decoder (12) outputs an H-level. Similarly, an upper-order decoder (14) compares a higher-order bit with a set value (2). Only while the higher-order bit is being coincident with a bit pattern related to the set value (2), the upper-order decoder (14) outputs an H-level. An AND circuit (10) renders a transistor (TR) conductive while both of the lower-order and higher-order decoders (12,14) are outputting the signals of H-levels.

Inventors:
NAKAO, Shigeharu (21, Saiin Mizosaki-cho, Ukyo-ku, Kyoto-sh, Kyoto 85, 6158585, JP)
中尾 重治 (〒85 京都府京都市右京区西院溝崎町21番地 ローム株式会社内 Kyoto, 6158585, JP)
Application Number:
JP2006/312597
Publication Date:
January 04, 2007
Filing Date:
June 23, 2006
Export Citation:
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Assignee:
ROHM CO., LTD. (21 Saiin Mizosaki-cho, Ukyo-ku Kyoto-sh, Kyoto 85, 6158585, JP)
ローム株式会社 (〒85 京都府京都市右京区西院溝崎町21番地 Kyoto, 6158585, JP)
NAKAO, Shigeharu (21, Saiin Mizosaki-cho, Ukyo-ku, Kyoto-sh, Kyoto 85, 6158585, JP)
International Classes:
H03K7/08; H01L33/00
Foreign References:
JPS5380271A
JP2001272938A
JPH01141412A
Attorney, Agent or Firm:
FUKAMI, Hisao et al. (Fukami Patent Office, Nakanoshima Central Tower, 22nd Floor, 2-7, Nakanoshima 2-chome, Kita-ku, Osaka-sh, Osaka 05, 5300005, JP)
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