Motor Driver. A3973 Datasheet


A3973 Driver. Datasheet pdf. Equivalent


Part Number

A3973

Description

Dual DMOS Full-Bridge Microstepping PWM Motor Driver

Manufacture

Allegro MicroSystems

Total Page 11 Pages
Datasheet
Download A3973 Datasheet


A3973
A3973
Dual DMOS Full-Bridge Microstepping PWM Motor Driver
Discontinued Product
This device is no longer in production. The device should not be
purchased for new design applications. Samples are no longer available.
Date of status change: November 1, 2010
Recommended Substitutions:
For existing customer transition, and for new customers or new appli-
cations, refer to the A3992.
NOTE: For detailed information on purchasing options, contact your
local Allegro field applications engineer or sales representative.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan
for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The
information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no respon-
sibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.
Free Datasheet http://www.datasheet4u.com/

A3973
A3973
Dual DMOS Full-Bridge Microstepping PWM Motor Driver
Features and Benefits
▪ ±1 A, 35 V Continuous Output Rating
▪ Low RDS(on) DMOS Output Drivers
▪ Optimized Microstepping via 6-Bit Linear DACs
▪ Programmable Mixed, Fast, and Slow Current Decay Modes
▪ 4 MHz Internal Oscillator for Digital Timing
▪ Serial-Interface Controls Chip Functions
▪ Synchronous Rectification for Low Power Dissipation
▪ Internal UVLO and Thermal Shutdown Circuitry
▪ Crossover-Current Protection
▪ Precision 2 V Reference
▪ Inputs Compatible with 3.3 or 5 V Control Signals
▪ Sleep and Idle Modes
Packages:
Package B, 24-pin DIP with
two batwing power tabs
Not to scale
Package LB, 24 pin SOICW
with 4 fused leads
Description
Designed for pulse-width modulated (PWM) current control
of bipolar microstepping stepper motors, the A3973 is capable
of continuous output currents to ±1 A and operating voltages
to 35 V. Internal fixed off-time PWM current-control timing
circuitry can be programmed via a serial interface to operate
in slow, fast, and mixed current-decay modes.
The desired load-current level is set via the serial port with
two 6-bit linear DACs in conjunction with a reference voltage.
The six bits of control allow maximum flexibility in torque
control for a variety of step methods, from microstepping to
full-step drive. Load current is set in 1.56% increments of the
maximum value.
Synchronous rectification circuitry allows the load current to
flow through the low RDS(on) of the DMOS output driver during
the current decay. This feature eliminates the need for external
clamp diodes in most applications, saving cost and external
component count, while minimizing power dissipation.
Internal circuit protection includes thermal shutdown with
hysteresis, transient-suppression diodes, and crossover-current
protection. Special power-up sequencing is not required.
The B package is a 24-lead DIPwith two copper batwing power
tabs. The LB is a 24-lead SOICW with four internally fused
leads for enhanced power dissipation. These power tabs and
pins are at ground potential and need no electrical isolation.
The A3973 B and LB packages are electrically identical.
29319.34 Rev. 4
Pin-out Diagram
VCP 1
CP1 2
CP2 3
OUT 1B 4
LOAD
SUPPLY 1
5 V BB1
GROUND 6
GROUND 7
SENSE 1 8
OUT 1A 99
STROBE 10
CLOCK 11
DATA 12
24 OSC
23 SLEEP
22 V REG
21 OUT 2B
V BB2 20
19
LOAD
SUPPLY 2
GROUND
18 GROUND
17 SENSE 2
16 OUT 2A
V DD
15
LOGIC
SUPPLY
14 MUX
13 REF
Dwg. PP-069-3
Free Datasheet http://www.datasheet4u.com/


Features A3973 Dual DMOS Full-Bridge Microsteppin g PWM Motor Driver Discontinued Produc t This device is no longer in productio n. The device should not be purchased f or new design applications. Samples are no longer available. Date of status c hange: November 1, 2010 Recommended Su bstitutions: For existing customer tran sition, and for new customers or new ap plications, refer to the A3992. NOTE: For detailed information on purchasing options, contact your local Allegro fie ld applications engineer or sales repre sentative. Allegro MicroSystems, Inc. r eserves the right to make, from time to time, revisions to the anticipated pro duct life cycle plan for a product to a ccommodate changes in production capabi lities, alternative product availabilit ies, or market demand. The information included herein is believed to be accur ate and reliable. However, Allegro Micr oSystems, Inc. assumes no responsibilit y for its use; nor for any infringement s of patents or other rights of third parties which may result .
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