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A3982 PDF даташит
| Спецификация A3982 изготовлена «Allegro» и имеет функцию, называемую «DMOS Stepper Motor Driver». |
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Детали детали
| Номер произв | A3982 |
| Описание | DMOS Stepper Motor Driver |
| Производители | Allegro |
| логотип |  |
11 Pages
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A3982
DMOS Stepper Motor Driver with Translator
Features and Benefits
▪ Low RDS(on) outputs
▪ Automatic current decay mode detection/selection
▪ Mixed and Slow current decay modes
▪ Synchronous rectification for low power dissipation
▪ Internal UVLO and thermal shutdown circuitry
▪ Crossover-current protection
Package: 24 pin SOICW with internally
fused leads (suffix LB)
Description
The A3982 is a complete stepper motor driver with built-
in translator for easy operation. It is designed to operate
bipolar stepper motors in full- and half-step modes, with an
output drive capacity of up to 35 V and ±2 A. The A3982
includes a fixed off-time current regulator which has the
ability to operate in Slow or Mixed decay modes.
The translator is the key to the easy implementation of the
A3982. Simply inputting one pulse on the STEP input drives
the motor one step. There are no phase sequence tables, high
frequency control lines, or complex interfaces to program.
The A3982 interface is an ideal fit for applications where a
complex microprocessor is unavailable or is overburdened.
The chopping control in the A3982 automatically selects
the current decay mode (Slow or Mixed). When a signal
occurs at the STEP input pin, the A3982 determines if
that step results in a higher or lower current in each of the
motor phases. If the change is to a higher current, then the
decay mode is set to Slow decay. If the change is to a lower
current, then the current decay is set to Mixed (set initially
to a fast decay for a period amounting to 31.25% of the
Not to scale
Continued on the next page…
Pin-out Diagram
OUT2A 1
SENSE2 2
VBB2 3
OUT2B 4
ENABLE 5
PGND 6
PGND 7
CP1 8
CP2 9
VCP 10
VREG 11
MS1 12
24 OUT1A
23 SENSE1
22 VBB1
21 OUT1B
20 DIR
19 PGND
18 PGND
17 REF
16 STEP
15 VDD
14 ROSC
13 RESET
26184.28C
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A3982
DMOS Stepper Motor Driver with Translator
Description (continued)
fixed off-time, then to a slow decay for the remainder of the
off-time). This current decay control scheme results in reduced
audible motor noise, increased step accuracy, and reduced power
dissipation.
Internal synchronous rectification control circuitry is provided to
improve power dissipation during PWM operation.
Internal circuit protection includes: thermal shutdown with
hysteresis, undervoltage lockout (UVLO), and crossover-current
protection. Special power-on sequencing is not required.
The A3982 is supplied in a 24-pin wide-body SOIC
(package LB) with internally-fused power ground leads for
enhanced thermal dissipation. It is lead (Pb) free, with 100%
matte tin plated leadframe.
Selection Guide
Part Number
A3982SLB-T
Packing*
31 pieces per tube
A3982SLBTR-T
1000 pieces per reel
*Contact Allegro for additional packing options
Package
24-pin Wide SOIC with pins 6 and 7, and 18
and 19, fused internally
Absolute Maximum Ratings
Characteristic
Load Supply Voltage
Logic Input Voltage
Sense Voltage
Reference Voltage
Output Current
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
VBB
VIN
VSENSE
VREF
IOUT
TA
TJ(max)
Tstg
Notes
Output current rating may be limited by duty cycle,
ambient temperature, and heat sinking. Under
any set of conditions, do not exceed the specified
current rating or a junction temperature of 150°C.
Range S
Rating
35
–0.3 to 7
0.5
4
±2
–20 to 85
150
–55 to 150
Units
V
V
V
V
A
ºC
ºC
ºC
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
Free Datasheet http://www.Datasheet4U.com
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A3982
DMOS Stepper Motor Driver with Translator
Functional Block Diagram
0.22 μF
0.1 μF
VDD
VREG
Current
Regulator
ROSC
OSC
CP1
CP2
Charge
Pump
VCP
REF
DAC
STEP
DIR
RESET
MS1
Translator
PWM Latch
Blanking
Mixed Decay
Control
Logic
ENABLE
PWM Latch
Blanking
Mixed Decay
DMOS Full Bridge
Gate
Drive
DMOS Full Bridge
VBB1
OUT1A
OUT1B
SENSE1
VBB2
OUT2A
OUT2B
SENSE2
DAC
0.1 μF
RS1
RS2
VREF
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
Free Datasheet http://www.Datasheet4U.com
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DataSheet26.com | 2020 | Контакты | Поиск |