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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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ML4428 Fiches technique(PDF) 1 Page - Micro Linear Corporation |
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ML4428 Fiches technique(HTML) 1 Page - Micro Linear Corporation |
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1 / 16 page  April 1997 PRELIMINARY ML4428* Sensorless Smart-Start™ BLDC PWM Motor Controller GENERAL DESCRIPTION The ML4428 motor controller provides all of the functions necessary for starting and controlling the speed of delta or wye-wound Brushless DC (BLDC) Motors without the need for Hall Effect sensors. Back-EMF voltage is sensed from the motor windings to determine the proper commutation phase sequence using PLL techniques. The patented back-EMF sensing technique used will commutate virtually any 3-phase BLDC motor that has at least a 30% variation in inductance during rotation and is insensitive to PWM noise and motor snubbing circuitry. The ML4428 also utilizes a patented start-up technique which samples the rotor position and applies the proper drive to accelerate the motor. This ensures no reverse rotation at start-up and reduces total start-up time. 1 FEATURES s Stand-alone operation with forward and reverse s On-board start sequence: Sense Position Æ Drive Æ Accelerate Æ Set Speed s No backward movement at start-up s Patented back-EMF commutation technique s Simple variable speed control with on-board reference s Single external resistor sets all critical currents s PWM control for maximum efficiency or linear control for minimum noise s 12V operation provides direct FET drive for 12V motors s Drives high voltage motors with high side FET drivers s Guaranteed no shoot-through when driving external FET gates directly * Some Packages Are End Of Life BLOCK DIAGRAM/TYPICAL APPLICATION 18 13 22 23 24 2 3 4 10 11 9 9V POWER FAIL BACK-EMF SAMPLER HIGH SIDE GATE DRIVE LOW SIDE GATE DRIVE VFLT VCO PHI1 PHI2 PHI3 P1 P2 P3 N1 N2 N3 28 GND PWM CURRENT CONTROL AND ONE SHOT 1 ISNS 26 CIOS START-UP AND COMMUTATION LOGIC 17 CSNS 25 BRAKE 8 6V REF 7 27 PWM SPEED CONTROL VSPEED VREF RREF CPWM CSC 5 6 VCO 16 15 RVCO CVCO 20 RCVCO 14 VCC 12 F/R 19 RINIT CISC 21 + – 0.6V RUN |
Numéro de pièce similaire - ML4428 |
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Description similaire - ML4428 |
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