Overview
The LA6503 was developed for CAV control CD-ROM drives, and provides spindle motor driver, sled motor driver, and sled motion/position detection circuits.

Functions and Features
• CAV control spindle motor driver
    — Three-phase brushless motor driver
    — IOmax = 1 A
    — Built-in FG output circuit (single Hall detection output)
    — Reverse braking circuit
    — Built-in start/stop circuit
    — Upper side current detection for minimal loss in the current detection resistor. Also, the voltage drop in this resistor reduces the IC internal power dissipation.
    — Built-in thermal shutdown circuit
• Sled motor driver
    — One built-in BTL driver channel
    — IOmax = 1 A
    — Wide dynamic range
    — Built-in level shifting circuit
    — Muting (output on/off) circuit
    — Built-in thermal shutdown circuit
• Sled motion/position detection circuit
    — Circuit that provides a pulse output corresponding to sled motion and position
    — This circuit emits 96 pulses for each rotation from a 24-pole magnet and  90° phase difference Hall element motors, and thus detects the distance moved. It also provides two 48-pulse outputs with differing phases such that the motion direction can be detected from the phase difference between those signals.
• Hall bias power supply
    — Generates the Hall element 3-V bias voltage.
    — IOmax = 30 mA, typical