A3955 查看數據表（PDF） - Allegro MicroSystems
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A3955 Datasheet PDF : 13 Pages
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A3955
Full-Bridge PWM Microstepping Motor Driver
ELECTRICAL CHARACTERISTICS at TA = 25°C, VBB = 5 V to 50 V, VCC = 4.5 V to 5.5 V
(unless otherwise noted.)
Characteristic
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)
Symbol Test Conditions
VBB
ICEX
VCE(SAT)
ISO
VF
IBB(ON)
IBB(OFF)
Operating, IOUT = ±1.5 A, L = 3 mH
VOUT = VBB
VOUT = 0 V
VS = 1.0 V:
Source Driver, IOUT = -0.85 A
Source Driver, IOUT = -1.5 A
Sink Driver, IOUT = 0.85 A
Sink Driver, IOUT = 1.5 A
IS - IOUT, IOUT = 850 mA,
VS = 0 V, VCC = 5 V
IF = 0.85 A
IF = 1.5 A
D0 = D1 = D2 = 0.8 V
Min.
Limits
Typ.
Max.
VCC
—
50
—
<1.0
50
—
<-1.0 -50
—
1.0
1.2
—
1.3
1.5
—
0.5
0.6
—
1.3
1.5
20
33
40
—
1.2
1.4
—
1.4
1.7
—
2.0
4.0
—
1.0
50
Units
V
μA
μA
V
V
V
V
mA
V
V
mA
μA
Continued next page…
Table 1 — PHASE Truth Table
PHASE
OUTA
OUTB
H
H
L
L
L
H
Table 2 — PFD Truth Table
VPFD
≥3.5 V
1.1 V to 3.1 V
≤0.8 V
Description
Slow Current-Decay Mode
Mixed Current-Decay Mode
Fast Current-Decay Mode
Table 3 — DAC Truth Table
DAC DATA
D2
D1
D0
Current
Ratio, %
VREF/VS
H
H
H
100
3.00
H
H
L
92.4
3.25
H
L
H
83.1
3.61
H
L
L
70.7
4.24
L
H
H
55.5
5.41
L
H
L
38.2
7.85
L
L
H
19.5
15.38
L
L
L
All Outputs Disabled
where VS = ITRIP•RS. See Applications section.
Allegro MicroSystems, Inc.
3
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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