发明名称 |
Mos integrated circuit for driving light-emitting diodes. |
摘要 |
An MOS integrated circuit for driving light-emitting diodes (LED's) comprises first constant current circuits, each of which is for one of the LED's and includes a first drive circuit for maintaining the drive current for the associated LED at a predetermined value established by a first reference voltage. The integrated circuit further includes a second constant current circuit which is connected to all of the first constant current circuits to form a mirror circuit with each of said first constant current circuits. A current detecting element detects a predetermined magnitude of current flowing therethrough and develops a current-representative detection voltage. A second drive circuit within the second constant current circuit responds to the detection voltage and a second reference voltage by maintaining said first reference voltage at a predetermined value so that the LED drive current is determined by the said detection voltage and second reference voltage.
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申请公布号 |
EP0342814(A2) |
申请公布日期 |
1989.11.23 |
申请号 |
EP19890304411 |
申请日期 |
1989.05.02 |
申请人 |
MITSUBISHI DENKI KABUSHIKI KAISHA |
发明人 |
SAMESHIMA, KAZUHIRO;OHNISHI, MASARU |
分类号 |
G05F3/26;G06K15/12;H05B33/08 |
主分类号 |
G05F3/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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