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ML4425

Micro Linear
Part Number ML4425
Manufacturer Micro Linear
Description Sensorless BLDC Motor Controller
Published May 7, 2005
Detailed Description July 2000 ML4425 Sensorless BLDC Motor Controller GENERAL DESCRIPTION The ML4425 PWM motor controller provides all of t...
Datasheet PDF File ML4425 PDF File

ML4425
ML4425

Overview
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.
The timing of the start-up sequence is determined by the selection of three timing capacitors.
This allows optimization for a wide range of motors and loads.
FEATURES s s s s Stand-alone operation Motor starts and stops with power t...


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