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PDF A4975 Data sheet ( Hoja de datos )
| Número de pieza | A4975 | |
| Descripción | Full-Bridge PWM Microstepping Motor Driver | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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A4975
Full-Bridge PWM Microstepping Motor Driver
Features and Benefits
▪ ±1.5 A continuous output current
▪ 50 V output voltage rating
▪ Internal PWM current control
▪ 3-bit nonlinear DAC
▪ Fast, mixed fast/slow, and slow current-decay modes
▪ Internal thermal shutdown circuitry
▪ Crossover-current and UVLO protection
Packages:
Package B, 16-pin DIP
with exposed tabs
Package LB, 16-pin SOIC
with internally fused pins
Not to scale
Description
The A4975 is designed to drive 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 50V. Internal pulse width modulated (PWM) current
control combined 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 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 and 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.
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Continued on the next page…
Functional Block Diagram
4975-DS
PHASE
7
6
VCC
10 15
VBB
16
GROUND
4
5
12
13
UVLO
& TSD
PFD 1
MIXED-DECAY
COMPARATOR
+
–
BLANKING
VCC
PWM LATCH
R
Q
S
BLANKING
GATE
CURRENT-SENSE
COMPARATOR
+
–
w5 D/A
+–
RC
3
VTH 2
8 9 14
SENSE
11
DISABLE
RS
CT
RT
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
A4975
Full-Bridge PWM Microstepping Motor Driver
Note the A4975SB (DIP) and the A4975SLB
(SOIC) are electrically identical and share a
common terminal number assignment.
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
Terminal Functions
Terminal
1
2
3
4-5
6
7
8
9
10
11
12-13
14
15
16
Name
Description
PFD
(Percent Fast Decay) The analog input used to set the current-decay mode.
REF
RC
GROUND
(VREF) The voltage at this input (along with the value of RS and the states of DAC inputs
D0, D1, and D2) set the peak output current.
The parallel combination of external resistor RT and capacitor CT set the off time for the
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PWM current regulator. CT also sets the blanking time.
Return for the logic supply (VCC) and load supply (VBB); the reference for all voltage
measurements.
LOGIC SUPPLY (VCC) Supply voltage for the logic circuitry. Typically = 5 V.
PHASE
The PHASE input determines the direction of current in the load.
D2
D1
OUTA
SENSE
(DATA2) One-of-three (MSB) control bits for the internal digital-to-analog converter.
(DATA1) One-of-three control bits for the internal digital-to-analog converter.
One-of-two output load connections.
Connection to the sink-transistor emitters. Sense resistor RS is connected between this
point and ground.
GROUND
Return for the logic supply (VCC) and load supply (VBB); the reference for all voltage
measurements.
D0
OUTB
LOAD SUPPLY
(DATA0) One-of-three (LSB) control bits for the internal digital-to-analog converter.
One-of-two output load connections.
(VBB) Supply voltage for the load.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
A4975
Full-Bridge PWM Microstepping Motor Driver
A
100
92.4
83.1
70.7
MAXIMUM FULL-STEP
55.5
38.2
19.5
5/8 STEP
3/4 STEP
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7/8 STEP
B
A
19.5
FULL STEP
B
38.2 55.5 70.7
CURRENT IN PER CENT
83.1 92.4 100
Dwg. GK-020-1
Figure 5 —
Current and Displacement Vectors
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet A4975.PDF ] | |
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