A3969
Dual Full-Bridge PWM Motor Driver
Functional Block Diagram
VCC
OUT 1A
OUT1B
PH1
UVLO
& TSD
EN1
BLANKING
PWM LATCH 1
GATE 1
R
Q
S
CURRENT-SENSE
COMPARATOR 1
+
–
OSC
V BB
OUT 2A
OUT2B VBB
PH2
CURRENT-SENSE
COMPARATOR 2
+
–
BLANKING
GATE 2
PWM LATCH 2
R
Q
S
÷4
UVLO
& TSD
EN2
GND
RC
RT
CT
SENSE 1
R1S
SENSE 2
R 2S
REF
Dwg. FP-036-7
Pin-out Diagram
NC 1
SENSE2 2
NC 3
GND 4
NC 5
EN2 6
PH2 7
LOGIC
LOGIC
VBB
21 OUT1B
20 NC
19 SENSE1
18 NC
17 GND
16 EN1
15 PH1
Allegro MicroSystems, Inc.
3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com