. H bridge drivers (output dynamic range maximum is about 2 V) on chip for four channels to drive each CD actuator (the focus the tracking coil, the spindle motor, and the sled motor). . coil, Step-up circuit (voltage to be set by an external resistor) on chip that is used to apply voltage to the CD DSP, ASP and.
. . . . . microcontroller. Center-tap coil for step-up circuit makes it possible to supply the driver control voltage. (However, the drive Tr, L, C, and Di are all external. ) O.
