a8902 Allegro MicroSystems, Inc., a8902 Datasheet - Page 2

• Manufacturer Part Number: a8902
• Description: 3-phase Brushless Dc Motor Controller/driver With Back-emf Sensing
• Manufacturer: Allegro MicroSystems, Inc.

2
8902–A
3-PHASE BRUSHLESS DC
MOTOR CONTROLLER/DRIVER
2.5
2.0
1.5
1.0
0.5
0
25
CENTERTAP
DATA IN
SECTOR
50
C WD
DATA
OSC
TEMPERATURE in C
R
JA
75
14
23
10
16
3
= 77 C/W
OUT A
OUT B
OUT C
R
JA
= 49 C/W
100
21
LOCKED LOOP
FREQUENCY-
SERIAL PORT
R
JT
22
= 6 C/W
125
SUPPLY
20
LOGIC
Dwg. GP-019C
V DD
15
150
FCOM
BLANK
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1992, 1995 Allegro MicroSystems, Inc.
MUX
17
COMMUTATION
C D1
WATCHDOG
24
CHARGE
DELAY
PUMP
TIMER
C D2
TSD
2
START-UP
OSC.
C ST
4
FILTER
BRAKE
13
BRAKE
11
CURRENT
CONTROL
CHARGE
C RES
BOOST
PUMP
12
V BB
R S
18-19
6-7
1
5
8
9
GROUND
LOAD
SUPPLY
OUT B
OUT C
GROUND
OUT A
Dwg. FP-034