3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING

The A8904SLB and A8904SLP are three-phase brushless dc motor controller/drivers designed for applications where accurate control of high speed motors is required. The three half-bridge outputs are low on-resistance n-channel DMOS devices capable of driving up to 1.2 A. The A8904 provides complete, reliable, self-contained back-EMF sensing, motor startup and running algorithms. A programmable digital frequency-locked loop speed control circuit together with the linear current control circuitry provides precise motor speed regulation.

Features

■ Pin-for-pin replacement for A8902CLBA

■ Startup commutation circuitry

■ Sensorless commutation circuitry

■ Option of external sector data tachometer signal

■ Option of external speed control

■ Oscillator operation up to 20 MHz

■ Programmable overcurrent limit

■ Transconductance gain options: 500 mA/V or 250 mA/V

■ Programmable watchdog timer

■ Directional control

■ Serial Port Interface

■ TTL-compatible inputs

■ System diagnostics data out ported in real time

■ Dynamic braking through serial port or external terminal

A8904SLPTR-T属于集成电路（IC） > 电机驱动器，控制器。Allegro MicroSystems制造生产的A8904SLPTR-T电机驱动器，控制器产品属于电机驱动器和控制器电源管理集成电路 (PMIC) 系列，可用于控制或操作从某电源施加到电机或相关机电执行器的电源。所实现的具体功能和特性集根据预期负载和预期应用的特性有很大差异，范围从用于有刷电机的简单开环速度控制到基于步进电机的高级闭环运动控制。