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屬于集成電路（IC） > 電機(jī)驅(qū)動(dòng)器，控制器。Allegro MicroSystems制造生產(chǎn)的A8904SLPTR-T電機(jī)驅(qū)動(dòng)器，控制器產(chǎn)品屬于電機(jī)驅(qū)動(dòng)器和控制器電源管理集成電路 (PMIC) 系列，可用于控制或操作從某電源施加到電機(jī)或相關(guān)機(jī)電執(zhí)行器的電源。所實(shí)現(xiàn)的具體功能和特性集根據(jù)預(yù)期負(fù)載和預(yù)期應(yīng)用的特性有很大差異，范圍從用于有刷電機(jī)的簡(jiǎn)單開(kāi)環(huán)速度控制到基于步進(jìn)電機(jī)的高級(jí)閉環(huán)運(yùn)動(dòng)控制。