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ML4426

Micro Linear
Part Number ML4426
Manufacturer Micro Linear
Description Bi-directional Sensorless BLDC Motor Controller
Published May 7, 2005
Detailed Description July 2000 ML4426* Bi-directional Sensorless BLDC Motor Controller GENERAL DESCRIPTION The ML4426 PWM motor controller p...
Datasheet PDF File ML4426 PDF File

ML4426
ML4426

Overview
July 2000 ML4426* Bi-directional Sensorless BLDC Motor Controller GENERAL DESCRIPTION The ML4426 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 ML4426 limits the motor current using a constant offtime PWM control loop.
The velocity loop is controlled with an onboard amplifier.
The ML4426 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 Motor starts and stops with power to IC s Bi-directional motor drive for applications requiring forward/ reverse operation s On-board start sequence: Align ® Ramp ® Set Speed s Patented Back-EMF commutation technique provides jitterless torque for minimum “spin-up” time s Onboard speed control loop s PLL used for commutation provides noise immunity from PWM spikes, compared to noise sensitive zero crossing technique s PWM control for maximum efficiency s Direct FET drive for 12V motors; drives high voltage motors with IC buffers from IR, IXYS, Harris, Power Integrations, Siliconix, etc.
(* Indicates Part Is End Of Life As Of July 1, 2000) BLOCK DIAGRAM (Pin Configuration Shown for 28 Pin Version) 17 VDD 750nA FB A 22 FB B 23 FB C 24 BACK EMF SAMPLER 1.
5V – + CAT 750nA VDD 19 CRT – 21 CRR 20 SPEED CVCO FB 15 16 RVCO 1.
5V + VDD 500nA VOLTAGE CONTROLLED OSCILLATOR VCO/TACH 13 VCO OUT F/R 12 + VCO OUT R A F B COMMUTATION STATE MACHINE HA HB GATING LOGIC & OUTPUT DRIVERS UVLO HC LA LB LC UV FAULT REFERENCE 2 3 4 9 10 11 ...


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