发明名称 |
DRIVE CIRCUIT FOR LIGHT-EMITTING DIODE, AND LIGHT-EMITTING DEVICE AND ELECTRONIC DEVICE USING THE SAME |
摘要 |
A current drive circuit capable of reducing the influence of temperature variation or individual deviation is provided. An output transistor is a PNP bipolar transistor, and has an emitter connected to a cathode of an LED string. A current control resistor is disposed between a collector of the output transistor and a ground terminal. An output terminal of an error amplifier is connected to a base of the output transistor, a first input terminal of the error amplifier is connected to a connection point of the output transistor and the current control resistor, and a reference voltage is applied to a second input terminal of the error amplifier. The error amplifier enables a sink current sunk from the output terminal to flow to the current control resistor.
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申请公布号 |
US2012188487(A1) |
申请公布日期 |
2012.07.26 |
申请号 |
US201213354769 |
申请日期 |
2012.01.20 |
申请人 |
HAGINO JUNICHI;HARUTA SHINGO;ROHM CO., LTD. |
发明人 |
HAGINO JUNICHI;HARUTA SHINGO |
分类号 |
G02F1/13357;H05B37/00 |
主分类号 |
G02F1/13357 |
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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