A4964: Sensorless Sinusoidal Drive BLDC Controller

Description

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.

A4964可以操作的工作周期(电压)有限公司ntrol, 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.

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  • Automotive fuel, oil, and urea pumps
  • Automotive fans and blowers
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Top Features

  • Three-phase sensorless BLDC motor control FET driver
  • Three-phase sinusoidal drive with soft start
  • Sensorless start-up and commutation
  • 风车检测和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

Part Number Specifications and Availability

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

Packaging

A4964 Packages