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8906

Description
BIDIRECTIONAL 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING
File Size160KB,12 Pages
ManufacturerAllegro
Websitehttp://www.allegromicro.com/
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8906 Overview

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

8906
BIDIRECTIONAL 3-PHASE BRUSHLESS DC MOTOR
CONTROLLER/DRIVER WITH BACK-EMF SENSING
LOAD
SUPPLY
C D2
C WD
CST
OUTA
GROUND
GROUND
OUT B
OUT C
CENTERTAP
BRAKE
C RES
1
2
V BB
COMMUTATION
DELAY
24
23
C D1
DATA IN
CLOCK
CHIP SELECT
RESET
GROUND
GROUND
DATA OUT
OSCILLATOR
LOGIC
SUPPLY
SECTOR
DATA
FILTER
Data Sheet
26301.4
SERIAL PORT
3
4
5
6
7
8
9
9
10
11
12
BOOST
CHARGE
PUMP
22
21
20
19
18
The A8906CLB is a bidirectional three-phase brushless dc motor
controller/driver. The three half-bridge outputs are low on-resistance n-
channel DMOS devices capable of driving up to 1 A. The A8906CLB
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, rotational
direction, startup current limit, sleep mode, diagnostic modes, and
others.
The A8906CLB 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
A8906CLB is provided in a 24-lead wide-body SOIC batwing package.
It provides for the smallest possible construction in surface-mount
applications.
MUX
FLL
VDD
17
16
15
14
13
PRELIMINARY INFORMATION
Dwg. PP-040B
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25
°
C
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.
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.
DMOS Outputs
Low
r
DS(on)
Startup Commutation Circuitry
Back-EMF Commutation Circuitry
Direction Control
Serial Port Interface
Frequency-Locked Loop Speed Control
Sector Data Tachometer Signal Input
Programmable Start-Up Current
Diagnostics Mode
Sleep Mode
Linear Current Control
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
(Subject to change without notice)
March 1, 1999
Always order by complete part number, e.g.,
A8906CLB
.

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