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Allegro MicroSystems

A8909CLB Datasheet Preview

A8909CLB Datasheet

3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING AND POWER DMOS OUTPUTS

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89093-A(SPDuVbHAjeNcAtCtoEScIENhaFnOBgReMRwAitUhToIOuStNnHDotAiLcTeA)ESSHESETDC MOTOR
8909CAOpriNl 3,T19R95OLLER/DRIVER WITH BACK-EMF SENSING
AND POWER DMOS OUTPUTS
3-PHASE BRUSHLESS DC MOTOR
CONTROLLER/DRIVER WITH BACK-EMF SENSING
AND POWER DMOS OUTPUTS
SUPPLY 1 VDD
TOSCC 2
COSCR 3
ULDC 4
YVBH 5
D LVBL 6
O NGND 7
GND 8
R OCLOCK 9
PLOAD 10
ESCLK 11
D CDATA 12
E NEXCOMM 13
DISCFOONRTIRNEUFEREAMUX 14
28 VM
27 C TAP
26 OUTC
25 BRAKE
24 FCOM
23 OUTB
22 GND
21 GND
20 R SENSE
19 BKDELAY
18 ERRCAP
17 OUTA
16 VICMD
15 VM
Dwg. PP-063
The A8909CLB is a three-phase brushless, back-EMF sensing,
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.
The internal sensorless commutation algorithm is based on earlier
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.
A serial peripheral interface provides control of programmable
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 rDS(on) of sources and sinks, regard-
less of motor supply voltage (5 V or 12 V).
The A8909CLB is supplied in a 28-lead low-profile SOIC batwing
power package for surface-mount applications.
FEATURES
s 3 Half-Bridge DMOS Outputs with Low ON Resistance
s 5 V Logic Supply, 5 V or 12 V Motor Supply
s Back-EMF Sensing and Commutation Algorithm with
Digital Programmable Timing Functions
s Adaptive Adjustable Digital Commutation Delay
s DC-to-DC Boost Voltage Generator for Source and Sink Gate Drive
s PWM Current-Control Loop with Sink-Side Chopping
s Transconductance Error Amp. with External Compensation for
Average Supply Current Control Loop
s PWM Oscillator with External Frequency-Setting Components
s Current-Sense Amplifier
s Power-Down Brake with Delay Set by External RC
s Analog/Digital Multiplexer for Diagnostics and Testing
s Thermal Monitor Voltage Available on Multiplexer
A
TM
MicroSystems, Inc.




Allegro MicroSystems

A8909CLB Datasheet Preview

A8909CLB Datasheet

3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING AND POWER DMOS OUTPUTS

No Preview Available !

8909
3-PHASE BRUSHLESS DC MOTOR
CONTROLLER/DRIVER WITH BACK-EMF SENSING
AND POWER DMOS OUTPUTS
s Back-EMF Zero-Crossing Output for Monitoring Motor Speed
s Sleep Mode
s Serial Port for Programming Modes, Multiplexer,
& Programmable Timers
A
TM
MicroSystems, Inc.
Dwg. FP-040
115 Northeast Cutoff, Box 15036
1W1o5rcNeosrttehre,aMsat sCsuatcohffu, sBeotxts1051063165-0036 (508) 853-5000
WCooprcyerisgthetr,©M1a9s9s3acAhlluesgerottsM0ic1r6o1S5y-s0t0e3m6s,(5In0c8.) 853-5000


Part Number A8909CLB
Description 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING AND POWER DMOS OUTPUTS
Maker Allegro MicroSystems
Total Page 2 Pages
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