A3955 Allegro MicroSystems, Inc., A3955 Datasheet - Page 3

• Manufacturer Part Number: A3955
• Description: Full-Bridge PWM Microstepping Motor Driver
• Manufacturer: Allegro MicroSystems, Inc.

A3955
ELECTRICAL CHARACTERISTICS at T
(unless otherwise noted.)
Power Outputs
Load Supply Voltage Range
Output Leakage Current
Output Saturation Voltage
(Forward or Reverse Mode)
Sense Current Offset
Clamp Diode Forward Voltage
(Sink or Source)
Motor Supply Current
(No Load)
1.1 V to 3.1 V
Characteristic
PHASE
≥3.5 V
≤0.8 V
V
H
L
PFD
Table 1 — PHASE Truth Table
Table 2 — PFD Truth Table
Description
Slow Current-Decay Mode
Mixed Current-Decay Mode
Fast Current-Decay Mode
OUT
H
L
A
Full-Bridge PWM Microstepping Motor Driver
Symbol
V
I
I
BB(OFF)
BB(ON)
CE(SAT)
V
I
I
CEX
V
SO
BB
F
OUT
Operating, I
V
V
V
I
I
I
D
Test Conditions
S
F
F
OUT
OUT
S
0
H
= 0.85 A
= 1.5 A
- I
L
Source Driver, I
Source Driver, I
Sink Driver, I
Sink Driver, I
V
= D
= 1.0 V:
A
OUT
S
B
= V
= 0 V
= 25°C, V
= 0 V, V
1
, I
= D
BB
OUT
OUT
2
= 850 mA,
= 0.8 V
CC
= ±1.5 A, L = 3 mH
OUT
OUT
= 5 V
OUT
OUT
BB
where V
= 0.85 A
= 1.5 A
D
= 5 V to 50 V, V
= -0.85 A
= -1.5 A
H
H
H
H
L
L
L
L
2
DAC DATA
S
= I
D
H
H
H
H
L
L
L
L
Table 3 — DAC Truth Table
TRIP
1
•R
S
D
H
H
H
H
. See Applications section.
L
L
L
L
0
CC
Min.
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
V
—
—
—
—
—
—
—
—
20
—
—
= 4.5 V to 5.5 V
CC
Ratio, %
Current
All Outputs Disabled
92.4
83.1
70.7
55.5
38.2
19.5
100
Typ.
<-1.0
2.0
1.0
<1.0
1.0
1.3
0.5
1.3
1.2
1.4
33
—
Limits
Continued next page…
Max.
-50
1.2
1.5
0.6
1.5
1.4
1.7
4.0
50
50
40
50
V
15.38
REF
3.00
3.25
3.61
4.24
5.41
7.85
/V
Units
S
mA
mA
μA
μA
μA
V
V
V
V
V
V
V
3