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PDF 3955 Data sheet ( Hoja de datos )
| Número de pieza | 3955 | |
| Descripción | FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de 3955 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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3955
PFD 1
REF 2
VBB
RC 3
GROUND 4
GROUND 5
LOGIC
SUPPLY
6 VCC
PHASE 7
LOGIC
D2 8
16
LOAD
SUPPLY
15 OUTB
14 D 0
13 GROUND
12 GROUND
11 SENSE
10 OUTA
9 D1
Dwg. PP-056-2
Note the A3955SB (DIP) and the A3955SLB
(SOIC) are electrically identical and share a
common terminal number assignment.
ABSOLUTE MAXIMUM RATINGS
Load Supply Voltage, VBB . . . . . . . . . . 50 V
Output Current, IOUT
(Continuous) . . . . . . . . . . . . . . ±1.5 A*
Logic Supply Voltage, VCC . . . . . . . . . 7.0 V
Logic/Reference Input Voltage Range,
VIN . . . . . . . . . . . -0.3 V to VCC + 0.3 V
Sense Voltage, VS . . . . . . . . . . . . . . . . 1.0 V
Package Power Dissipation,
PD . . . . . . . . . . . . . . . . . . . . See Graph
Operating Temperature Range,
TA . . . . . . . . . . . . . . . . . -20˚C to +85˚C
Junction Temperature, TJ . . . . . . . +150˚C†
Storage Temperature Range,
TS . . . . . . . . . . . . . . . . -55˚C to +150˚C
* Output current rating may be limited by duty
cycle, ambient temperature, and heat sinking.
Under any set of conditions, do not exceed the
specified current rating or a junction temperature
of 150˚C.
† Fault conditions that produce excessive junction
temperature will activate the device’s thermal
shutdown circuitry. These conditions can be
tolerated but should be avoided.
FULL-BRIDGE PWM
MICROSTEPPING MOTOR DRIVER
The A3955SB and A3955SLB are designed for driving one winding
of a bipolar stepper motor in a microstepping mode. The outputs are
rated for continuous output currents to ±1.5 A and operating voltages
to 50 V. Internal pulse-width modulated (PWM) current control com-
bined with an internal three-bit nonlinear digital-to-analog converter
allows the motor current to be controlled in full-, half-, quarter-, or
eighth-step (microstepping) modes. Nonlinear increments minimize
the number of control lines necessary for microstepping.
Microstepping provides for increased step resolution, and reduces
torque variations and resonance problems at low speed.
Internal circuitry determines whether the PWM current-control
circuitry operates in a slow (recirculating) current-decay mode, fast
(regenerative) current-decay mode, or in a mixed current-decay mode
in which the off time is divided into a period of fast current decay with
the remainder of the fixed off time spent in slow current decay. The
combination of user-selectable current-sensing resistor and reference
voltage, digitally selected output current ratio; and slow, fast, or mixed
current-decay modes provides users with a broad, variable range of
motor control.
Internal circuit protection includes thermal shutdown with hyster-
esis, transient-suppression diodes, and crossover current protection.
Special power-up sequencing is not required.
The A3955S— is supplied in a choice of two power packages; a
16-pin dual-in-line plastic package with copper heat-sink tabs (suffix
‘B’), and a 16-lead plastic SOIC with copper heat-sink tabs (suffix ‘LB’).
For both package styles, the power tab is at ground potential and
needs no electrical isolation.
FEATURES
s ±1.5 A Continuous Output Current
s 50 V Output Voltage Rating
s Internal PWM Current Control
s 3-Bit Non-Linear DAC
s Fast, Mixed Fast/Slow, and Slow Current-Decay Modes
s Internal Transient-Suppression Diodes
s Internal Thermal-Shutdown Circuitry
s Crossover-Current and UVLO Protection
Always order by complete part number:
Part Number
Package
A3955SB
16-Pin DIP
A3955SLB
16-Lead SOIC
1 page  
3955
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
Control Circuitry (cont’d)
Thermal Shutdown Temp.
Thermal Shutdown Hysteresis
AC Timing
Symbol
TJ
∆TJ
Test Conditions
Min.
Limits
Typ. Max.
Units
— 165 —
— 15 —
°C
°C
PWM RC Fixed Off-time
PWM Turn-Off Time
PWM Turn-On Time
PWM Minimum On Time
Crossover Dead Time
tOFF RC
tPWM(OFF)
tPWM(ON)
tON(min)
tCODT
CT = 470 pF, RT= 43 kΩ
Current-Sense Comparator Trip
to Source OFF, IOUT = 100 mA
Current-Sense Comparator Trip
to Source OFF, IOUT = 1.5 A
IRC Charge ON to Source ON,
IOUT = 100 mA
IRC Charge ON to Source ON,
IOUT = 1.5 A
VCC = 5.0 V, RT ≥ 43 kΩ, CT = 470 pF
IOUT = 100 mA
1 kΩ Load to 25 V
18.2 20.2 22.3
— 1.0 1.5
— 1.4 2.5
— 0.4 0.7
—
0.55
0.85
1.0 1.6 2.2
0.3 1.5 3.0
µs
µs
µs
µs
µs
µs
µs
5 Page 
3955
FULL-BRIDGE PWM
MICROSTEPPING
MOTOR DRIVER
Table 4 — Step Sequencing
Full
Step
1
2
3
4
Half
Step
1
2
3
4
5
6
7
8
Quarter Eighth
Step Step
11
2
23
4
35
6
47
8
59
10
6 11
12
7 13
14
8 15
16
9 17
18
10 19
20
11 21
22
12 23
24
13 25
26
14 27
28
15 29
30
16 31
32
Bridge A
PHASEA D2A D1A D0A
HHL L
HLHH
HLHL
HLLH
XLLL
LLLH
L LHL
L LHH
LHL L
LHLH
LHH L
LHHH
LHHH
LHHH
LHH L
LHLH
LHL L
L LHH
L LHL
LLLH
XLLL
HLLH
HLHL
HLHH
HHL L
HHL H
HHH L
HHHH
HHHH
HHHH
HHH L
HHL H
Bridge B
ILOADA PHASEB D2B
D1B
D0B
ILOADB
70.7% H H L L 70.7%
55.5% H H L H 83.1%
38.2% H H H L 92.4%
19.5% H H H H 100%
0% H H H H 100%
-19.5%
H
H
H
H 100%
-38.2%
H
H
H
L 92.4%
-55.5%
H
H
L
H 83.1%
-70.7%
H
H
L
L 70.7%
-83.1%
H
L
H
H 55.5%
-92.4%
H
L
H
L 38.2%
-100% H L L H 19.5%
-100%
X
L
L
L
0%
-100% L L L H -19.5%
-92.4%
L
L
H
L -38.2%
-83.1%
L
L
H
H -55.5%
-70.7%
L
H
L
L -70.7%
-55.5%
L
H
L
H -83.1%
-38.2%
L
H
H
L -92.4%
-19.5%
L
H
H
H -100%
0% L H H H -100%
19.5% L H H H -100%
38.2% L H H L -92.4%
55.5% L H L H -83.1%
70.7% L H L L -70.7%
83.1% L L H H -55.5%
92.4% L L H L -38.2%
100% L L L H -19.5%
100% X L L L 0%
100% H L L H 19.5%
92.4% H L H L 38.2%
83.1% H L H H 55.5%
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet 3955.PDF ] | |
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