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