May 1997 ML4411*/ML4411A** Sensorless Spindle Motor Controller GENERAL DESCRIPTION The ML4411 provides complete commutation for delta or wye wound Brushless DC (BLDC) motors without the need for signals from Hall Effect Sensors.
This IC senses the back EMF of the three motor windings (no neutral required) to determine the proper commutation phase angle using Phase Lock Loop techniques.
This technique will commutate virtually any 3-phase BLDC motor and is insensitive to PWM noise and motor snubbing.
The ML4411 is architecturally similar to the ML4410 but with improved braking and brown-out recovery circuitry.
Included in the ML4411 is the circuitry necessary for a Hard Disk Drive microcontro...

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