发明名称 |
LED driving semiconductor circuit and LED driving apparatus including the same |
摘要 |
A LED driving semiconductor circuit of the present invention includes a first input terminal connected to a light-emitting diode, a switching device block having a first FET and a first switching device, a reference voltage terminal which is connected to the first FET and outputs the reference voltage, a start/stop circuit which outputs a start signal when the reference voltage is equal to or larger than a predetermined value and outputs a stop signal when the reference voltage is less than the predetermined value, a current detection circuit which detects the current flowing through the first switching device, and a control circuit which controls ON/OFF of the first switching device intermittently at the predetermined frequency based on the output signal of the start/stop circuit and the output signal of the current detection circuit so that the constant current flows through the light-emitting diode.
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申请公布号 |
US7115888(B2) |
申请公布日期 |
2006.10.03 |
申请号 |
US20050236818 |
申请日期 |
2005.09.28 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
HACHIYA YOSHIAKI;ARAKAWA RYUTARO |
分类号 |
H01L31/14;G09G3/06;H01L33/00;H05B37/02 |
主分类号 |
H01L31/14 |
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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