A3955 Ver la hoja de datos (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 (continued) at TA = 25°C, VBB = 5 V to 50 V, VCC = 4.5 V to
5.5 V (unless otherwise noted. )
Characteristic
Symbol Test Conditions
Min.
Limits
Typ. Max.
Units
Control Circuitry
Logic Supply Voltage Range
Reference Voltage Range
UVLO Enable Threshold
UVLO Hysteresis
Logic Supply Current
Logic Input Voltage
Logic Input Current
Mixed-Decay Comparator
Trip Points
Mixed-Decay Comparator
Input Offset Voltage
Mixed-Decay Comparator
Hysteresis
Reference Input Current
Reference Divider Ratio
Digital-to-Analog Converter
Accuracy*
Current-Sense Comparator
Input Offset Voltage*
VCC
VREF
Operating
Operating
VCC = 0 → 5 V
ICC(ON)
ICC(OFF)
VIN(1)
VIN(0)
IIN(1)
IIN(0)
VPFD
VIO(PFD)
D0 = D1 = D2 = 0.8 V
VIN = 2.0 V
VIN = 0.8 V
Slow Current-Decay Mode
Mixed Current-Decay Mode
Fast Current-Decay Mode
∆VIO(PFD)
IREF
VREF/VS
—
VIO(S)
VREF = 0 V to 2.5 V
at trip, D0 = D1 = D2 = 2 V
1.0 V < VREF 2.5 V
0.5 V < VREF 1.0 V
VREF = 0 V
4.5
5.0
5.5
V
0.5
—
2.5
V
3.35
3.70
4.05
V
0.30
0.45
0.60
V
—
42
50
mA
—
12
16
mA
2.0
—
—
V
—
—
0.8
V
—
<1.0
20
μA
—
<-2.0 -200
μA
3.5
—
—
V
1.1
—
3.1
V
—
—
0.8
V
—
0
±20
mV
5.0
25
55
mV
—
—
±5.0
μA
—
3.0
—
—
—
—
±3.0
%
—
—
±4.0
%
—
—
±5.0
mV
Step Reference
Current Ratio
SRCR
D0 = D1 = D2 = 0.8 V
D0 = 2 V, D1 = D2 = 0.8 V
D0 = 0.8 V, D1 = 2 V, D2 = 0.8 V
D0 = D1 = 2 V, D2 = 0.8 V
D0 = D1 = 0.8 V, D2 = 2 V
D0 = 2 V, D1 = 0.8 V, D2 = 2 V
D0 = 0.8 V, D1 = D2 = 2 V
D0 = D1 = D2 = 2 V
—
0
—
%
—
19.5
—
%
—
38.2
—
%
—
55.5
—
%
—
70.7
—
%
—
83.1
—
%
—
92.4
—
%
—
100
—
%
Continued next page…
* The total error for the VREF/VS function is the sum of the D/A error and the current-sense comparator input offset voltage.
Allegro MicroSystems, Inc.
4
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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