3−PHASE FULL WAVE BRUSHLESS DC MOTOR DRIVER IC FOR CD−ROM DRIVES

This 3−phase, full−wave, brushless DC motor driver IC has been developed for use in CD−ROM drive spindle motors. The TA8490F contains in its upper stage a discrete power transistor which, thanks to its low−saturation characteristic, enables the IC to provide superior thermal efficiency.
Furthermore, the multi−chip structure of this device facilitates dispersion of the heat generated inside the package, making it possible to suppress heat concentration.

FEATURES
• Multi−chip structure (3 RN6006 chips built−in)
• 3−phase, full−wave, semi−linear drive
• Current drive / current control
• Built−in current limiter : ILIM = 0.6A (typ.) (at RF = 0.3 Ω)
• Built−in reversing brake / short brake functions
• FG signal output (using hall element output signal)
• Built−in switching regulator controller
• Built−in hall bias
• Built−in thermal shutdown circuit