| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an LED drive circuit capable of stably operating as an amplifier circuit and suppressing generations of unwanted radiation noise. <P>SOLUTION: An LED drive circuit for driving an LED unit having at least one of LED comprises: a drive part having a driving transistor for driving the LED unit and an emitter resistance connected to an emitter of the driving transistor and detecting current flowing through the LED unit as voltage generated between emitter resistances; an amplifier circuit for supplying output voltage to the driving transistor; a first feedback circuit for feeding back output signal of the amplifier to an input side of the amplifier; and a second feedback circuit for feeding back a detected voltage at the emitter resistance of the driving transistor to the input of the amplifier. <P>COPYRIGHT: (C)2013,JPO&INPIT |
