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PDF A4973 Data sheet ( Hoja de datos )
| Número de pieza | A4973 | |
| Descripción | Full-Bridge PWM Motor Driver | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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A4973
Full-Bridge PWM Motor Driver
Features and Benefits
▪ ±1.5 A continuous output current
▪ 50 V output voltage rating
▪ 3 V to 5.5 V logic supply voltage
▪ Internal PWM current control
▪ Fast and slow current-decay modes
▪ Sleep (low current consumption) mode
▪ Internal transient-suppression diodes
▪ 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
Designed for bidirectional pulse width modulated (PWM)
current control of inductive loads, the A4973 is capable of
continuous output currents to ±1.5 A and operating voltages
to 50 V. Internal fixed off-time PWM current-control circuitry
can be used to regulate the maximum load current to a desired
value. The peak load current limit is set by the user’s selection
of an input reference voltage and external sensing resistor. The
fixed off-time pulse duration is set by a user- selected external
RC timing network. Internal circuit protection includes thermal
shutdown with hysteresis, transient-suppression diodes, and
crossover current protection. Special power-up sequencing is
not required.
With the ENABLE input held low, the PHASE input controls
load current polarity by selecting the appropriate source and
sink driver pair. The MODE input determines whether the
PWM current-control circuitry operates in a slow current-decay
mode (only the selected source driver switching) or in a fast
current-decay mode (selected source and sink switching). A
user-selectable blanking window prevents false triggering of
the PWM current-control circuitry. With the ENABLE input
held high, all output drivers are disabled. A sleep mode is
providedwww.DataSheet.co.kr to reduce power consumption.
Continued on the next page…
Functional Block Diagram
LOGIC
SUPPLY
6 V CC
MODE 14
PHASE 7
ENABLE 8
BRAKE 1
GROUND
4
5
SLEEP &
STANDBY MODES
UVLO
& TSD
9
10 15
16
V BB
BLANKING
V CC
PWM LATCH
R
Q
S
RC
3
CT
RT
+–
V TH
2
2
REF
11
SENSE
RS
12
13
GROUND
4973DS
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
A4973
Full-Bridge PWM Motor Driver
BRAKE
ENABLE
HH
HH
HL
HL
HL
HL
LX
X = Don’t care.
PHASE
X
X
H
H
L
L
X
TRUTH TABLE
MODE
H
L
H
L
H
L
X
OUTA
Off
Off
H
H
L
L
L
OUTB
Off
Off
L
L
H
H
L
DESCRIPTION
Sleep Mode
Standby
Forward, Fast Current-Decay Mode
Forward, Slow Current-Decay Mode
Reverse, Fast Current-Decay Mode
Reverse, Slow Current-Decay Mode
Brake
www.DataSheet.co.kr
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 
A4973
Full-Bridge PWM Motor Driver
Revision History
Revision
Final
Revision Date
Description of Revision
December 19, 2011 Update production availability
www.DataSheet.co.kr
Copyright ©2009-2011, Allegro MicroSystems, Inc.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to per-
mit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the
information being relied upon is current.
Allegro’s products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the
failure of that life support device or system, or to affect the safety or effectiveness of that device or system.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use;
nor for any infringement of patents or other rights of third parties which may result from its use.
For the latest version of this document, visit our website:
www.allegromicro.com
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 11 Páginas | |
| PDF Descargar | [ Datasheet A4973.PDF ] | |
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