ML4425CS ,Product information ML4425Sensorless BLDC Motor Controller
ML4425IP ,Sensorless BLDC motor controllerGeneral Description• Stand-alone operation The ML4425 PWM motor controller provides all of the • Mo ..
ML4425IS ,Sensorless BLDC motor controllerGeneral Description• Stand-alone operation The ML4425 PWM motor controller provides all of the • Mo ..
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ML4425CS-ML4425IP-ML4425IS
Product information
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 efficiency Direct FET drive for 12V motors; drives high voltage
motors with IC buffers
General DescriptionThe 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.
The ML4425 limits the motor current using a constant off-
time 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.
