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ML4425 - Sensorless BLDC Motor Controller

Datasheet Summary

Description

The ML4425 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 s s s Stand-alone operation Motor starts and stops with power to IC On-board start sequence: Align ® Ramp ® Set Speed Patented Back-EMF commutation technique provides jitterless torque for minimum “spin-up” time Onboard speed control loop PLL used for commutation provides noise immunity from PWM spikes, compared to noise sensitive zero crossing technique PWM control for maximum efficiency Direct FET drive for 12V motors; drives high voltage motors with IC buffers from IR, IXYS, Harris, Power.

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Datasheet Details

Part number ML4425
Manufacturer Micro Linear
File Size 353.12 KB
Description Sensorless BLDC Motor Controller
Datasheet download datasheet ML4425 Datasheet
Additional preview pages of the ML4425 datasheet.

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Full PDF Text Transcription

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July 2000 ML4425 Sensorless BLDC Motor Controller GENERAL DESCRIPTION The ML4425 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 ML4425 limits the motor current using a constant offtime PWM control loop. The velocity loop is controlled with an onboard amplifier. The ML4425 has circuitry to ensure that there is no shoot-through in directly driven external power MOSFETs.
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