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Allegro MicroSystems

A8905CLB Datasheet Preview

A8905CLB Datasheet

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

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8905
3-PHASE BRUSHLESS DC
8905MOTOR CONTROLLER/DRIVER
3-PHASE BRUSHLESS DC MOTOR
CONTROLLER/DRIVER WITH BACK-EMF SENSING
The A8905CLB isw a three-phase brushless dc motor controller/
driver for use with CD-ROM or DVD drives. The three half-bridge
LOAD
SUPPLY
1
V BB
COMMUTATION
DELAY
24 C D1
outputs are low on-resistance n-channel DMOS devices capable of
driving up to 1.25 A. The A8905CLB provides complete, reliable,
C D2 2
23 DATA IN
self-contained back-EMF sensing motor startup and running algorithms.
C WD 3
22 CLOCK
A programmable digital frequency-locked loop speed control circuit
together with the linear current control circuitry provides precise motor
CST 4
OUTA 5
GROUND 6
TGROUND 7
COUTB 8
UOUTC 99
D YCENTERTAP 10
LBRAKE 11
O NCRES 12
21 CHIP SELECT
20 RESET
19 GROUND
18 GROUND
MUX
17 DATA OUT
BOOST
CHARGE
PUMP
FLL 16 OSCILLATOR
VDD 15
LOGIC
SUPPLY
14 INDEX
13 FILTER
R ODwg. PP-040-1
P EABSOLUTE MAXIMUM RATINGS
at TA = +25°C
D CLoad Supply Voltage, VBB . . . . . . 14 V
E NOutput Current, IOUT . . . . . . . . ±1.25 A
Logic Supply Voltage, VDD . . . . 6.0 V
U ELogic Input Voltage Range,
INVIN . . . . . . . -0.3 V to VDD + 0.3 V
RPackage Power Dissipation,
T EPD . . . . . . . . . . . . . . . . See Graph
Operating Temperature Range,
N FTA . . . . . . . . . . . . . . 0°C to +70°C
O EJunction Temperature, TJ . . . +150°C†
Storage Temperature Range,
C RTS . . . . . . . . . . . . -55°C to +150°C
† Fault conditions that produce excessive
junction temperature will activate device thermal
IS Rshutdown circuitry. These conditions can be
tolerated, but should be avoided.
D OOutput current rating may be restricted to a value
Fdetermined by system concerns and factors.
speed regulation.
A serial port allows the user to program various features and modes
of operation, such as the speed control parameters, startup current limit,
sleep mode, diagnostic modes, and others.
APPLICATIONS
s CD-ROMs
s DVDs
FEATURES
s DMOS Outputs
s Low rDS(on)
s Startup Commutation Circuitry
s Back-EMF Commutation Circuitry
s Serial Port Interface
s Frequency-Locked Loop Speed Control
s Tachometer Signal Input
s Programmable Start-Up Current
s Diagnostics Mode
s Sleep Mode
s Linear Current Control
s Internal Current Sensing
s Dynamic Braking Through Serial Port
s Power-Down Dynamic Braking
s System Diagnostics Data Out
s Data Out Ported in Real Time
s Internal Thermal Shutdown Circuitry
These include: system duty cycle and timing,
ambient temperature, and use of any heatsinking
and/or forced cooling. For reliable operation, the
specified maximum junction temperature should
not be exceeded.
Always order by complete part number, e.g., A8905CLB .




Allegro MicroSystems

A8905CLB Datasheet Preview

A8905CLB Datasheet

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

No Preview Available !

8905
3-PHASE BRUSHLESS DC
MOTOR CONTROLLER/DRIVER
FUNCTIONAL BLOCK DIAGRAM
OUT A
OUT B
OUT C
CENTERTAP 10
LOGIC
SUPPLY
15
VDD
C D1
24
C D2 C ST BRAKE
24
11
BRAKE
FCOM COMMUTATION
DELAY
START-UP
OSC.
BLANK
C RES
12
BOOST
CHARGE
PUMP
VBB
1 LOAD
SUPPLY
5 OUT A
8 OUT B
9 OUTC
C WD 3
INDEX 14
OSC 16
FREQUENCY-
LOCKED LOOP
WATCHDOG
TIMER
CHARGE
PUMP
CURRENT
CONTROL
RS
DATA IN 23
SERIAL PORT
MUX
TSD
6-7 GROUND
21 22 20
17
13
FILTER
18-19 GROUND
Dwg. FP-034-1
2.5
RθJT = 6°C/W
2.0
1.5
R θJA = 55°C/W
1.0
0.5
0
25 50 75 100 125 150
TEMPERATURE in °C
Dwg. GP-019B
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1998 Allegro MicroSystems, Inc.


Part Number A8905CLB
Description 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING
Maker Allegro MicroSystems
Total Page 12 Pages
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