a8909clb Allegro MicroSystems, Inc., a8909clb Datasheet

a8909clb

Manufacturer Part Number

a8909clb

Description

3-phase Brushless Dc Motor Controller/driver With Back-emf Sensing And Power Dmos Outputs

Manufacturer

Allegro MicroSystems, Inc.

Datasheet

1.A8909CLB.pdf (2 pages)

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8909

3-PHASE BRUSHLESS DC MOTOR

CONTROLLER/DRIVER WITH BACK-EMF SENSING

AND POWER DMOS OUTPUTS

EXCOMM

SUPPLY

CLOCK

ADVANCE INFORMATION DATA SHEET

(Subject to change without notice)

April 3, 1995

OSC

AMUX

OSC

LOAD

DATA

SCLK

GND

LDC

CONTROLLER/DRIVER WITH BACK-EMF SENSING

Dwg. PP-063

FCOM

GND

BKDELAY

ERRCAP

VICMD

C TAP

OUT

BRAKE

OUT

GND

OUT

SENSE

3-PHASE BRUSHLESS DC MOTOR

8909

spindle-motor driver that integrates analog bipolar, analog and digital

CMOS control functions, and DMOS power outputs on a single mono-

lithic chip. It provides complete back-EMF sensing, commutation

control, and drive of a spindle motor, and provides for an orderly spin-

down in the event of supply-voltage removal. Energy for retracting the

heads is regenerated from the spinning motor, while a controlled delay

allows for a full retract before dynamic braking. The pulse-width

modulation system and power DMOS outputs provide control of high

currents with minimum power dissipation in the chip, and minimal

average power supply currrent.

Allegro back-EMF sensing spindle-motor driver products that have

proven capability. This system features digital adaptive commutation

delay, programmable digital commutation timers, and minimal micro

overhead during startup. This results in enhanced resynchronization

during a power fault followed by a restart.

features and mode switches. An onboard dc-to-dc converter provides

regulated boost voltage for both the high-side and sink-side gate-drive

circuits. This provides for optimal r

less of motor supply voltage (5 V or 12 V).

power package for surface-mount applications.

FEATURES

3 Half-Bridge DMOS Outputs with Low ON Resistance

5 V Logic Supply, 5 V or 12 V Motor Supply

Back-EMF Sensing and Commutation Algorithm with

Digital Programmable Timing Functions

Adaptive Adjustable Digital Commutation Delay

DC-to-DC Boost Voltage Generator for Source and Sink Gate Drive

PWM Current-Control Loop with Sink-Side Chopping

Transconductance Error Amp. with External Compensation for

Average Supply Current Control Loop

PWM Oscillator with External Frequency-Setting Components

Current-Sense Amplifier

Power-Down Brake with Delay Set by External RC

Analog/Digital Multiplexer for Diagnostics and Testing

Thermal Monitor Voltage Available on Multiplexer

A A

AND POWER DMOS OUTPUTS

The A8909CLB is a three-phase brushless, back-EMF sensing,

The internal sensorless commutation algorithm is based on earlier

A serial peripheral interface provides control of programmable

The A8909CLB is supplied in a 28-lead low-profile SOIC batwing

MicroSystems, Inc.

DS(on)

of sources and sinks, regard-

Related parts for a8909clb

a8909clb Summary of contents

Page 1

... This provides for optimal r less of motor supply voltage ( V). The A8909CLB is supplied in a 28-lead low-profile SOIC batwing power package for surface-mount applications. FEATURES 3 Half-Bridge DMOS Outputs with Low ON Resistance ...

Page 2

... Back-EMF Zero-Crossing Output for Monitoring Motor Speed Sleep Mode Serial Port for Programming Modes, Multiplexer, & Programmable Timers 115 Northeast Cutoff, Box 15036 TM TM 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993 Allegro MicroSystems, Inc. Dwg. FP-040 ...

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