Rev.1.00, Sep.22.2003, page 1 of 6

M56733AFP

3-Phase Brushless Motor Driver

REJ03F0081-0100Z

Rev.1.0

Sep.22.2003

Description

The M56733AFP is a semiconductor integrated circuit designed as a single-chip controller for FDD spindle motors. It

incorporates a power amplifier, Hall amplifier, FG amplifier, oscillator, and speed discriminator, along with various

protective circuits. Control of switching between three speeds by the single MOD pin gives this IC the edge for use in

compact systems.

Features

• Digital servo provides high precision, good stability, and freedom from the need for adjustment.

• A single pin controls switching between three speed. ••• MOD

• Two enable signals. ••• EN, EN

• I

• Low-capacitance damping capacitor

Applications

• FDD spindle motors (5 inches)

Recommended Operating Conditions

• Power-supply voltage: 10.8 (min.) to 13.2 (max.), 12.0 (typ.)

• Oscillation frequency: 492 kHz

• Maximum output current: 800 mA

• FG amplifier input signal level: 5 mVp-p or more