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ML4411 - Sensorless Spindle Motor Controller

Datasheet Summary

Description

The ML4411 provides complete commutation for delta or wye wound Brushless DC (BLDC) motors without the need for signals from Hall Effect Sensors.

Features

  • s s s s s s s Back-EMF commutation provides maximum torque for minimum “spin-up” time for spindle motors Accurate, jitter-free phase locked motor speed feedback output Linear or PWM motor current control Easy microcontroller interface for optimized start-up sequencing and speed control Power fail detect circuit with delayed braking Drives external N-channel FETs and P-channel FETs Back-EMF comparator detects motor rotation after power fail for fast re-lock after brownout.
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Datasheet Details

Part number ML4411
Manufacturer Micro Linear
File Size 296.51 KB
Description Sensorless Spindle Motor Controller
Datasheet download datasheet ML4411 Datasheet
Additional preview pages of the ML4411 datasheet.

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Full PDF Text Transcription

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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 microcontroller driven control loop.
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