LED DRIVER CIRCUIT CAPABLE OF ADJUSTING OUTPUT CURRENT,申请号US20080139502-传众专利搜索

LED DRIVER CIRCUIT CAPABLE OF ADJUSTING OUTPUT CURRENT

申请公布号：US2009309510(A1)

申请号：US20080139502

申请日期：2008.06.15

申请公布日期：2009.12.17

申请人：

LIU DA-YI

发明人：LIU DA-YI

分类号：H05B41/36;H03F17/00

主分类号：H05B41/36

摘要：An LED driver circuit includes a power controller, a voltage regulator, a detecting resistor, a light emitting device, and a voltage detecting circuit. The voltage detecting circuit has a first input end connected to a higher potential end of the detecting resistor, and a second input end thereof is connected to a lower potential end of the detecting resistor. The output end of the voltage detecting circuit is connected to a feedback end of the power controller so as to output a detected voltage signal to the power controller for adjusting the output voltage and supplying a stable and proper value of current to the light emitting device. The voltage detecting circuit is a differential amplifier capable of detecting the voltage difference between the detecting resistor and amplifying it as a feedback to the power controller. Therefore, the output current from the power controller is precisely controlled.