| 摘要 |
PROBLEM TO BE SOLVED: To provide a drive circuit of a VCM capable of setting a current range.SOLUTION: A current detection circuit 10 generates a detection voltage Vs given according to a formula Vs=V+k×I, where Iis a drive current, Vis a reference voltage, and k is a gain. An error amplifier 20 generates an error voltage Vby amplifying the error of a control voltage Vfor instructing the amount of displacement of a VCM 200 and the detection voltage Vs. A first driver 30 sources or sinks the drive current Ito one end of a coil L1, depending on the error voltage V. A second driver 40 sinks or sources the drive current Ito the other end of a coil L1, depending on the error voltage V. A drive circuit 2 is configured so that the level of the reference voltage can be set externally. |
