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ML4426 - Bi-directional Sensorless BLDC Motor Controller

Datasheet Summary

Description

The ML4426 PWM motor controller provides all of the functions necessary for starting and controlling the speed of delta or wye wound Brushless DC (BLDC) motors without Hall Effect sensors.

Features

  • s Motor starts and stops with power to IC s Bi-directional motor drive for.

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Datasheet Details

Part number ML4426
Manufacturer Micro Linear
File Size 353.23 KB
Description Bi-directional Sensorless BLDC Motor Controller
Datasheet download datasheet ML4426 Datasheet
Additional preview pages of the ML4426 datasheet.

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Full PDF Text Transcription

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July 2000 ML4426* Bi-directional Sensorless BLDC Motor Controller GENERAL DESCRIPTION The ML4426 PWM motor controller provides all of the functions necessary for starting and controlling the speed of delta or wye wound Brushless DC (BLDC) motors without Hall Effect sensors. Back EMF voltage is sensed from the motor windings to determine the proper commutation phase sequence using a PLL. This patented sensing technique will commutate a wide range of 3Phase BLDC motors and is insensitive to PWM noise and motor snubbing circuitry. The ML4426 limits the motor current using a constant offtime PWM control loop. The velocity loop is controlled with an onboard amplifier. The ML4426 has circuitry to ensure that there is no shoot-through in directly driven external power MOSFETs.
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