Motor Driver. A3972 Datasheet


A3972 Driver. Datasheet pdf. Equivalent


Part Number

A3972

Description

Dual DMOS Full-Bridge Microstepping PWM Motor Driver

Manufacture

Allegro MicroSystems

Total Page 11 Pages
Datasheet
Download A3972 Datasheet


A3972
A3972
Dual DMOS Full-Bridge Microstepping PWM Motor Driver
Features and Benefits
±1.5 A, 50 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
Package: 24-pin DIP with 4 fused leads
(suffix B)
Not to scale
Description
Designed for pulse-width modulated (PWM) current control
of bipolar microstepping stepper motors, the A3972 is capable
of continuous output currents to ±1.5 A and operating voltages
to 50 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 will eliminate 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 A3972SB is supplied in a 24-pin plastic DIP with two
batwing power tabs (suffix ‘B’). The power tabs are at ground
potential and need no electrical isolation. The device is lead
(Pb) free with 100% matte tin leadframe plating.
Pin-out Diagram
29319.33, Rev. D

A3972
A3972
Dual DMOS Full-Bridge
Microstepping PWM Motor Driver
Selection Guide
Part Number
A3972SB-T
Packing
15 pieces/tube
Absolute Maximum Ratings
Characteristic
Symbol
Notes
Rating
Units
Load Supply Voltage
Output Current*
Logic Supply Voltage
VBB
IOUT
VDD
50 V
±1.5 A
7.0 V
Logic Input Voltage Range
Reference Voltage
Sense Voltage (DC)
VIN
VREF
VS
–0.3 to VDD + 0.3
3
500
V
V
mV
Package Power Dissipation
Operating Ambient Temperature
PD
TA Range S
3.1
–20 to 85
W
ºC
Junction Temperature
TJ
150 ºC
Storage Temperature
Tstg
–55 to 150
ºC
*Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed
the specied current rating or a junction temperature of 150°C.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2


Features 3972 CHARGE PUMP DUAL DMOS FULL-BRIDGE MICROSTEPPING PWM MOTOR DRIVER VCP CP1 CP2 OUT1B LOAD SUPPLY1 GROUND GROUND SE NSE1 OUT1A STROBE CLOCK DATA 1 2 3 4 5 6 7 8 9 9 10 11 12 24 23 22 21 20 19 18 17 16 OSC SLEEP VREG OUT2B LOAD SUPPLY 2 GROUND GROUND SENSE2 OUT2A LOGIC SUPP LY MUX REF 6-BIT DAC & LOGIC 6-BIT DA C & LOGIC VBB1 VBB2 SERIAL PORT VDD 15 14 13 Dwg. PP-069-3 ABSOLUTE MAX IMUM RATINGS at TA = +25°C Load Supply Voltage, VBB ................ 50 V Out put Current, IOUT ..................... . ±1.5 A Logic Supply Voltage, VDD ... ........... 7.0 V Logic Input Voltage R ange, VIN ................ -0.3 V to VD D + 0.3 V Reference Voltage, VREF ..... ................ 3 V Sense Voltage (dc) , VS ................ 500 mV Package Po wer Dissipation, PD ................... ....................... 3.1 W Operating Temperature Range, TA ................ .......... -20°C to +85°C Junction Te mperature, TJ ............. +150°C Sto rage Temperature Range, TS ......................... -55°C to +150°C.
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