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8905 PDF даташит

Спецификация 8905 изготовлена ​​​​«Allegro MicroSystems» и имеет функцию, называемую «3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING».

Детали детали

Номер произв 8905
Описание 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING
Производители Allegro MicroSystems
логотип Allegro MicroSystems логотип 

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8905 Даташит, Описание, Даташиты
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 .









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8905 Даташит, Описание, Даташиты
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.









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8905 Даташит, Описание, Даташиты
8905
3-PHASE BRUSHLESS DC
MOTOR CONTROLLER/DRIVER
ELECTRICAL CHARACTERISTICS at TA = +25°C, VDD = 5.0 V
Characteristic
Logic Supply Voltage
Logic Supply Current
Load Supply Voltage
Thermal Shutdown
Thermal Shutdown Hys.
Output Drivers
Output Leakage Current
Total Output ON Resistance
Output Sustaining Voltage
Clamp Diode Forward Voltage
Control Logic
Logic Input Voltage
Logic Input Current
DATA Output Voltage
CST Current
CST Threshold
Filter Current
CD Current
CD Current Matching
CD Threshold
CWD Current
Symbol
VDD
IDD
VBB
TJ
TJ
IDSX
rDS(on)
VDS(sus)
VF
VIN(0)
VIN(1)
IIN(0)
IIN(1)
VOUT(0)
VOUT(1)
ICST
VCSTH
VCSTL
IFILTER
ICD
VCD
ICWD
Test Conditions
Operating
Operating
Sleep Mode
Operating
VBB = 14 V, VOUT = 14 V
VBB = 14 V, VOUT = 0 V
IOUT = 600 MA
VBB = 14 V, IOUT = IOUT(MAX), L = 3 mH
IF = 1.0 A
INDEX, RESET, CLK,
CHIP SELECT, OSC, BRAKE
VIN = 0 V
VIN = 5.0 V
IOUT = 500 µA
IOUT = -500 µA
Charging
Discharging
Charging
Discharging
Leakage, VFILTER = 2.5 V
Charging
Discharging
ICD(DISCHRG)/ICD(CHRG)
Charging
Min.
4.5
4.5
Limits
Typ. Max.
5.0 5.5
7.5 10
— 1.5
— 14
165 —
20 —
Units
V
mA
mA
V
°C
°C
— 1.0 300 µA
— -1.0 -300 µA
— 1.1 1.4
14 — —
V
— 1.25 1.5
V
-0.3 — 1.5 V
3.5 — 5.3 V
— — -0.5 µA
— — 1.0 µA
— — 1.5 V
3.5 — — V
14 20 28 µA
-14 -20 -28 µA
2.1 2.5 2.9
V
— 500 — mV
7.0 10 15 µA
-7.0 -10 -15 µA
— 5.0 — nA
14 22 28 µA
-26 -35 -66 µA
1.7 2.2 2.3 —
— 2.5 —
V
14 22 28 µA
Continued next page …










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