| 摘要 |
PURPOSE:To drive efficiently an inductive load and to prevent generation of signal distortion by separating an output converting a signal voltage into a current into an output for a feedback system and an output fed to a load and applying respectively them to the voltage/current converting circuit and the load. CONSTITUTION:In setting the emitter area of transistors (TR) 54, 64 and 56, 66 to 1:n, currents IR, IL flowing to output circuits 22, 26 have the relation of IL=nIR (n>1), and the drive current IL is increased by the small current IR with high accuracy. An output section of a voltage/current converting circuit 18 is provided with the circuit 22 as a current driver detecting a feedback current, the circuit 26 is installed as a load current driver, the load 24 is driven exclusively by the output current of the circuit 26, and the feedback to the circuit 18 is applied by an output current of the circuit 22. As a result, the drive/feedback of the load 24 is executed independently and the effect of the load 24 on the feedback circuit is avoided.
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