a4954 Allegro MicroSystems, Inc., a4954 Datasheet - Page 4

• Manufacturer Part Number: a4954
• Description: Dual Full-bridge Dmos Pwm Motor Driver
• Manufacturer: Allegro MicroSystems, Inc.

A4954
PWM Control Timing Diagram
PWM Control Truth Table
Note: Z indicates high impedance.
IN1, IN3
0
1
0
1
1
0
I
I
OUT1
OUT2
IN2, IN4
IN1, IN3
IN2, IN4
1
0
1
0
1
0
–I
–I
OUT3
OUT4
10×V
,
–I
+I
V
V
V
V
REG
REG
0 A
IN(1)
IN(0)
IN(1)
IN(0)
False
False
False
False
True
True
S
> V
REF
Mixed Decay
Forward/
Characteristic Performance
OUT1, OUT3
H/L
H
Z
L
L
L
Mixed Decay
Reverse/
OUT2, OUT4
H/L
H
Z
L
L
L
(Slow Decay)
Forward /
Brake
Reverse
Forward
Chop (mixed decay), reverse
Chop (mixed decay), forward
Brake (slow decay); after a Chop command
Coast, enters Low Power Standby mode after 1 ms
Dual Full-Bridge DMOS
(Slow Decay)
Reverse/
Brake
PWM Motor Driver
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
Function
4