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A8902CLBA PDF预览

A8902CLBA

更新时间: 2024-02-16 07:13:09
品牌 Logo 应用领域
急速微 - ALLEGRO 驱动器电动机控制电机控制器
页数 文件大小 规格书
12页 157K
描述
3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING

A8902CLBA 数据手册

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8902–A  
3-PHASE BRUSHLESS DC MOTOR  
CONTROLLER/DRIVER WITH BACK-EMF SENSING  
The A8902CLBA is a three-phase brushless dc motor controller/  
driver for use in 5 V or 12 V hard-disk drives. The three half-bridge  
LOAD  
SUPPLY  
COMMUTATION  
DELAY  
1
24  
23  
C
V
D1  
outputs are low on-resistance n-channel DMOS devices capable of  
driving up to 1.25 A. The A8902CLBA 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.  
BB  
DATA IN  
C
2
3
4
D2  
22 CLOCK  
21  
C
WD  
C
CHIP SELECT  
ST  
20 RESET  
OUT  
5
6
A
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.  
19  
18  
GROUND  
GROUND  
GROUND  
GROUND  
7
8
OUT  
B
DATA OUT  
OSCILLATOR  
MUX  
17  
16  
15  
The A8902CLBA is fabricated in Allegro’s BCD (Bipolar CMOS  
DMOS) process, an advanced mixed-signal technology that combines  
bipolar, analog and digital CMOS, and DMOS power devices. The  
A8902CLBA is provided in a 24-lead wide-body SOIC batwing package.  
It provides for the smallest possible construction in surface-mount  
applications.  
9
OUT  
C
FLL  
V
LOGIC  
SUPPLY  
CENTERTAP 10  
DD  
BOOST  
CHARGE  
PUMP  
SECTOR  
DATA  
14  
BRAKE  
11  
12  
C
13 FILTER  
RES  
Dwg. PP-040B  
FEATURES  
DMOS Outputs  
ABSOLUTE MAXIMUM RATINGS  
at TA = +25°C  
Low rDS(on)  
Startup Commutation Circuitry  
Back-EMF Commutation Circuitry  
Serial Port Interface  
Load Supply Voltage, VBB . . . . . . . . . . 14 V  
Output Current, IOUT . . . . . . . . . . . . ±1.25 A  
Logic Supply Voltage, VDD . . . . . . . . . 6.0 V  
Logic Input Voltage Range,  
VIN . . . . . . . . . . . -0.3 V to VDD + 0.3 V  
Package Power Dissipation, PD See Graph  
Operating Temperature Range,  
TA . . . . . . . . . . . . . . . . . . 0°C to +70°C  
Junction Temperature, TJ . . . . . . . +150°C†  
Storage Temperature Range,  
Frequency-Locked Loop Speed Control  
Sector Data Tachometer Signal Input  
Programmable Start-Up Current  
Diagnostics Mode  
Sleep Mode  
Linear Current Control  
TS . . . . . . . . . . . . . . . -55°C to +150°C  
Internal Current Sensing  
Dynamic Braking Through Serial Port  
Power-Down Dynamic Braking  
System Diagnostics Data Out  
Data Out Ported in Real Time  
Internal Thermal Shutdown Circuitry  
† Fault conditions that produce excessive junction  
temperature will activate device thermal shutdown  
circuitry. These conditions can be tolerated, but  
should be avoided.  
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.  
Always order by complete part number, e.g., A8902CLBA .  

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