公开(公告)号：US20120038332A1

公开(公告)日：2012-02-16

申请号：US13194628

申请日：2011-07-29

Applicant: Yung-Cheng LIN

Inventor： Yung-Cheng LIN

IPC: G05F1/573

CPC classification number: G05F1/575

Abstract: A linear regulator and a current sensing circuit are provided. The linear regulator comprises a pass transistor, a compensation capacitor, a variable resistor, an error amplifier and a current sensing circuit comprising a sense transistor controlled by the error amplifier and a voltage follower coupled with the second terminal of the pass transistor and the second terminal of the sense transistor. The sense transistor receives an input voltage, and generates a sense current proportional to a pass current. The voltage follower controls the voltage at the second terminal of the sense transistor to be the same as that at the second terminal of the pass transistor, and adjusts the resistance of the variable resistor according to the voltages at the second terminal of the pass transistor, the voltage at the second terminal of the sense transistor, and the sense current flowing through the sense transistor.

Abstract translation: 提供线性调节器和电流检测电路。 线性调节器包括传输晶体管，补偿电容器，可变电阻器，误差放大器和电流感测电路，其包括由误差放大器控制的检测晶体管和与传输晶体管的第二端子耦合的电压跟随器，以及第二端子 的感测晶体管。 感测晶体管接收输入电压，并产生与通过电流成正比的感测电流。 电压跟随器将感测晶体管的第二端子处的电压控制为与通过晶体管的第二端子处的电压相同，并根据传输晶体管的第二端子处的电压来调节可变电阻器的电阻， 感测晶体管的第二端子处的电压以及流过读出晶体管的感测电流。