A4964: Sensorless Sinusoidal Drive BLDC Controller

The A4964 is a three-phase, sensorless, brushless DC (BLDC) motor controller for use with external N-channel power MOSFETs and is specifically designed for automotive applications. It is designed to provide the motor control functions in a system where a small microcontroller provides the communication interface to a central ECU and intelligent fault and status handling. The A4964 provides the supply and watchdog for the microcontroller and the high-voltage interfaces between the microcontroller and the central ECU and ignition switch. The A4964 can also operate as an independent singlechip remote motor controller.

The motor is driven using 3-phase sinusoidal current drive where phase commutation is determined, without the need for independent position sensors, by monitoring the motor back-EMF (bemf). The sensorless start-up scheme includes forward and reverse pre-rotation (windmill) detection and synchronization, and allows the A4964 to operate over a wide range of motor and load combinations.

The A4964 can operate with duty cycle (voltage) control, current (torque limit) control, and closed-loop speed control. Control mode, operating mode, and control parameters are programmed through an SPI-compatible serial interface.

A single current sense amplifier provides peak current limiting and average current measurement through the serial interface.

Integrated diagnostics provide indication of undervoltage, overtemperature, and power bridge faults and can protect the power switches under most short-circuit conditions.

The A4964 is provided in a 36-terminal QFN and a 32-lead QFP, both with exposed thermal pad.

Applications

  • Automotive fuel, oil, and urea pumps
  • Automotive fans and blowers
DATASHEETS
SAMPLE & BUY

Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
141 John Street, Suite 300
Babylon, NY 11702
Phone: (631)422-2500
Fax: (631)422-2504
Web: www.astrorepinc.com
Email: donna.tweedy@astrorepinc.com

If this is not your local representative, find your local sales rep here.

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  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • Three-phase sensorless BLDC motor control FET driver
  • Three-phase sinusoidal drive with soft start
  • Sensorless start-up and commutation
  • Windmill detection and synchronization
  • Bootstrap gate drive for N-channel MOSFET bridge
  • 5.5 to 50 V supply range
  • SPI-compatible interface
  • Programmable control modes: speed, voltage, current
  • Peak current limiting
  • Control via SPI or PWM
  • Programmable gate drive for slew rate control
  • LIN / PWM physical interface with wake
  • Logic supply regulator with current limit
  • MCU watchdog and reset
  • Ignition switch interface
  • Diagnostics, status, current, and speed feedback
A4964 Packages

Click the image to view larger
A4964 Product image A4964 Block Diagram A4964 Typical Application

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A4964KEVTR-J 36-lead QFN/MLP -40°C to 150°C Yes View Data New Contact your
local sales rep
Check Stock
A4964KJPTR-T 32-lead LQFP -40°C to 150°C Yes View Data New Contact your
local sales rep
Check Stock
APEK4964KEV-01-T DEMO BOARD -40°C to 150°C No -- Contact your
local sales rep
Check Stock
APEK4964KJP-01-T DEMO BOARD -40°C to 150°C No -- Contact your
local sales rep
Check Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

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