參數(shù)資料
型號(hào)： A8905CLB
廠商： Allegro MicroSystems, Inc.
英文描述： 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING
中文描述： 3相無(wú)刷直流電動(dòng)機(jī)控制器/驅(qū)動(dòng)器，反電動(dòng)勢(shì)遙感
文件頁(yè)數(shù)： 1/12頁(yè)
文件大?。?/td> 163K
代理商： A8905CLB
8905
3-PHASE BRUSHLESS DC
MOTOR CONTROLLER/DRIVER
Output current rating may be restricted to a value
determined by system concerns and factors.
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.
—FORREFERENCEONLY
Always order by complete part number, e.g.,
A8905CLB
.
The A8905CLB isw a three-phase brushless dc motor controller/
driver for use with CD-ROM or DVD drives. The three half-bridge
outputs are low on-resistance n-channel DMOS devices capable of
driving up to 1.25 A. The A8905CLB 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.
A serial port allows the user to program various features and modes
of operation, such as the speed control parameters, startup current limit,
APPLICATIONS
I
CD-ROMs
I
DVDs
FEATURES
I
DMOS Outputs
I
Low r
DS(on)
I
Startup Commutation Circuitry
I
Back-EMF Commutation Circuitry
I
Serial Port Interface
I
Frequency-Locked Loop Speed Control
I
Tachometer Signal Input
I
Programmable Start-Up Current
I
Diagnostics Mode
I
Sleep Mode
I
Linear Current Control
I
Internal Current Sensing
I
Dynamic Braking Through Serial Port
I
Power-Down Dynamic Braking
I
System Diagnostics Data Out
I
Data Out Ported in Real Time
I
Internal Thermal Shutdown Circuitry
1
2
3
4
5
6
7
8
9
9
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
BRAKE
FILTER
DATA IN
LOGIC
SUPPLY
GROUND
CHIP SELECT
CLOCK
RESET
GROUND
GROUND
GROUND
DD
V
CST
OUTA
OUTB
OUTC
CD1
Dwg. PP-040-1
BB
V
LOAD
SUPPLY
CWD
CD2
DATA OUT
INDEX
CENTERTAP
OSCILLATOR
CRES
S
FLL
MUX
COMMUTATION
DELAY
BOOST
CHARGE
PUMP
D
2
8905
3-PHASE BRUSHLESS DC MOTOR
CONTROLLER/DRIVER WITH BACK-EMF SENSING
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25
°
Load Supply Voltage, V
BB
. . . . . .
14 V
Output Current, I
OUT
. . . . . . . .
±
1.25 A
Logic Supply Voltage, V
DD
. . . .
6.0 V
Logic Input Voltage Range,
V
IN
. . . . . . .
-0.3 V to V
DD
+ 0.3 V
Package Power Dissipation,
P
D
. . . . . . . . . . . . . . . .
See Graph
Operating Temperature Range,
T
A
. . . . . . . . . . . . . .
0
°
C to +70
°
C
Junction Temperature, T
J
. . .
+150
°
C
Storage Temperature Range,
T
S
. . . . . . . . . . . .
-55
°
C to +150
°
C
Fault conditions that produce excessive
junction temperature will activate device thermal
shutdown circuitry. These conditions can be
tolerated, but should be avoided.
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參數(shù)描述
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