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參數(shù)資料
| 型號： | A8909CLB |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING AND POWER DMOS OUTPUTS |
| 中文描述： | 3相無刷直流電動機控制器/驅(qū)動器，反電動勢遙感與電源DMOS輸出 |
| 文件頁數(shù)： | 1/2頁 |
| 文件大?。?/td> | 63K |
| 代理商： | A8909CLB |
8909
3-PHASE BRUSHLESS DC MOTOR
CONTROLLER/DRIVER WITH BACK-EMF SENSING
AND POWER DMOS OUTPUTS
DISCONTINUEDPRODUCT
I
Transconductance Error Amp. with External Compensation for
Average Supply Current Control Loop
I
PWM Oscillator with External Frequency-Setting Components
I
Current-Sense Amplifier
I
Power-Down Brake with Delay Set by External RC
I
Analog/Digital Multiplexer for Diagnostics and Testing
I
Thermal Monitor Voltage Available on Multiplexer
A
—FORREFERENCEONLY
3-PHASE BRUSHLESS DC MOTOR
CONTROLLER/DRIVER WITH BACK-EMF SENSING
AND POWER DMOS OUTPUTS
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 r
DS(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
I
3 Half-Bridge DMOS Outputs with Low ON Resistance
I
5 V Logic Supply, 5 V or 12 V Motor Supply
I
Back-EMF Sensing and Commutation Algorithm with
Digital Programmable Timing Functions
I
Adaptive Adjustable Digital Commutation Delay
I
DC-to-DC Boost Voltage Generator for Source and Sink Gate Drive
1
2
3
4
5
9
10
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12
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23
24
25
26
27
28
VM
SUPPLY
VM
VICMD
OUT
ERRCAP
LDC
GND
GND
AMUX
LOAD
CLOCK
V
BL
V
BH
OSC
OSC
C TAP
OUT
BRAKE
FCOM
OUT
B
GND
V
DD
SENSE
BKDELAY
SCLK
DATA
EXCOMM
7
22
21
8
6
A
C
GND
Dwg. PP-063
TM
McroSystems, Inc.
D
2
8909
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