Patent attributes
It is desirable that some voltage can be supplied as emergency backup even upon occurrence of abnormality such as a failure. The amplifier circuit in a semiconductor device supplies an output signal having a voltage produced by amplifying an input voltage Vin from a variable voltage source to one end of a coil load, and supplies a predetermined fixed voltage of 0V, for example, to the other end of the coil load to rotate the coil load with the voltage difference between these output signals, thus performing loading control of a CD tray and a DVD tray. The semiconductor device clamps the voltage of the output signal to a predetermined non-zero voltage so that a sufficient drive voltage can be obtained even if a loading control terminal T1 is grounded, thus realizing emergency backup loading control of the tray.
