LB8108M
Features
- Includes four H bridge driver channels to drive the four CD player actuators (focus coil, tracking coil, spindle motor and sled motor). (output dynamic range: maximum of about 2 V)
- Includes a 3.9 V (typical) step-up circuit to supply the DSP, ASP and microprocessor used in the CD player. Also includes another voltage step-up circuit whose voltage can be set with external resistors. (However, note that the transistors, inductors, capacitors and diodes required for drive operation are all external ponents.)
- Built-in oscillator circuit for these converters (external resistor and capacitor required)
- Detects the maximum value of the four driver outputs and supplies a voltage slightly higher than that voltage to the H bridge block in each of the four channels using PWM voltage converter. This allows a drive scheme with extremely low loss to be implemented. (However, note that the pnp transistor, inductor, capacitor, and diodes for the PWM circuit are all external ponents.)
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