Product Summary

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 3-Phase BLDC motors and is 
insensitive to PWM noise and motor snubbing circuitry

Features

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 ef?ciency
? Direct FET drive for 12V motors; drives high voltage 
motors with IC buffers