ML4411A

The ML4411A 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 ML4411A is architecturally similar to the ML4410 but with improved braking and brown-out recovery circuitry. Included in the ML4411A is the circuitry necessary for a Hard Disk Drive microcontroller driven control loop.

The ML4411A controls motor current with either a constant off-time PWM or linear current control driven by the microcontroller. Braking and Power Fail are also included in the ML4411A.

The timing of the start-up sequencing is determined by the micro, allowing the system to be optimized for a wide range of motors and inertial loads.

The ML4411A modulates the gates of external N-Channel power MOSFETs to regulate the motor current. The IC drives P-Channel MOSFETs directly.