A4975SB-T

Manufacturer Part NumberA4975SB-T
DescriptionDIP 16/Full-Bridge PWM Microstepping Motor Driver
ManufacturerAllegro Micro Systems, Inc.
A4975SB-T datasheets
 


Specifications of A4975SB-T

Pack_quantity25Comm_code85423990
Lead_time168  
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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
Package LB, 16-pin SOIC
with exposed tabs
with internally fused pins
Not to scale
PHASE
7
GROUND
4
5
12
13
MIXED-DECAY
COMPARATOR
PFD
1
+
V
CC
Preliminary Datasheet
4975-DS
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 50 V. 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.
Continued on the next page…
Functional Block Diagram
6
V
CC
UVLO
& TSD
BLANKING
CURRENT-SENSE
GATE
COMPARATOR
PWM LATCH
R
Q
S
5
BLANKING
+ –
RC
V TH
3
2
C T
R T
Subject to Change Without Notice March 8, 2011
A4975
10
15
16
V
BB
SENSE
11
+
D/A
DISABLE
R S
8
9
14