A3989 Allegro MicroSystems, A3989 Datasheet - Page 3

• Manufacturer Part Number: A3989
• Description: Bipolar Stepper and High Current DC Motor Driver
• Manufacturer: Allegro MicroSystems

A3989
VREF1
VREF2
PHASE3
ENABLE
VREF3
PHASE1
PHASE2
MODE
VDD
I02
I12
I01
I11
Sense 3
Sense1
Sense 2
3
3
3
OSC
Bipolar Stepper and High Current DC Motor Driver
CHARGE PUMP
Control Logic
Stepper Motor
Control Logic
DC Motor
PWM Latch
BLANKING
PWM Latch
BLANKING
PWM Latch
BLANKING
0.1 µF
50 V
Functional Block Diagram
0.1 µF
50 V
DRIVE
DRIVE
GATE
GATE
V
V
CP
CP
Full Bridge 1
Full Bridge 2
DMOS
DMOS
Sense 2
Sense 3
Full Bridge 3
DMOS
VBB1
VBB1
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
SENSE1
SENSE2
SENSE3
SENSE3
OUT1A
OUT1B
OUT2A
OUT2B
OUT3A
OUT3A
OUT3B
OUT3B
100 µF
50 V
R
S1
0.22 µF
50 V
R
R
S2
S3
V
To
BB2
3