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DESCRIPTION
The A4964 is a three-phase, sensorless, brushless DC
(BLDC) motor contoler for use with extemal N-chamel
power MOSFETs and is specificlly designed fo atomotive
applictions. It is designed to provide the motor control
functions ina system where a small microcontolle provides
the commumication interface to cetral ECU and inelligen
fault and staus handling. The A4964 provides te spply and
watchdog forthemicrocontrolerandthehigh-voltageineraces
between the microcontolerand the cental ECU and ignition
switch. The A4964 can also operate as an independentsingle-
chip remote motor controller.
The motor is driven using 3-phase sinusoidal curent drive
where phase commutation is determined, without the neec
for independent position sensors, by monitoring the moton
back-EMF (bemf). The sensorlesstart-up scheme includes
forward and reverse pre-rotation (windmil) detection anc
synchronization, andallows the A4964 to operate over a wide
range of motor and load combinations.
TheA4964 canoperatewithduty cycle(voltage) control. curen
(torque limit) control and cloed-oop speed contol Contro
mode,operating mode, andcontrolparametersareprogrammec
through an SPI-compatible serialinerface.
Asingle curent sense amplifier provides peak current limitins
A4964KEVTR-J
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