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PDF A4986 Data sheet ( Hoja de datos )
| Número de pieza | A4986 | |
| Descripción | DMOS Dual Full-Bridge PWM Motor Driver | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de A4986 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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A4986
DMOS Dual Full-Bridge PWM Motor Driver
with Overcurrent Protection
Features and Benefits
▪ Low RDS(ON) outputs
▪ Internal mixed current decay mode
▪ Synchronous rectification for low power dissipation
▪ Internal UVLO
▪ Crossover-current protection
▪ 3.3 and 5 V compatible logic supply
▪ Thin profile QFN and TSSOP packages
▪ Thermal shutdown circuitry
▪ Short-to-ground protection
▪ Shorted load protection
▪ Low current Sleep mode, < 10 μA
Package:
24-pin TSSOP
with exposed thermal pad
(LP Package)
Approximate size
Description
The A4986 is a dual DMOS full-bridge stepper motor driver
with parallel input communication and overcurrent protection.
Each full-bridge output is rated up to 35 V and ±2 A.
The A4986 includes fixed off-time pulse width modulation
(PWM) current regulators, along with 2- bit nonlinear DACs
(digital-to-analog converters) that allow stepper motors to be
controlled in full, half, and quarter steps. The PWM current
regulator uses the Allegro® patented mixed decay mode for
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.
The outputs are protected from shorted load and short-to-
ground events, which protect the driver and associated circuitry
from thermal damage or flare-ups. Other protection features
include thermal shutdown with hysteresis, undervoltage lockout
(UVLO) and crossover current protection. Special power-up
sequencing is not required.
The A4986 is supplied in a 24-pin TSSOP (LP) with exposed
thermal pad for enhanced thermal performance. It has a
0.65 pitch and an overall package height of ≤1.2 mm. It is lead
(Pb) free, with 100% matte tin leadframe plating.
Typical Application Diagram
Microcontroller or
Controller Logic
VDD
0.22 μF
0.1 μF
0.1 μF
0.22 μF
VREG ROSC CP1
VDD
CP2
VCP VBB1
VBB2
SLEEP
IN01
IN02
PH1
IN11
IN12
PH2
VREF
A4986
OUT1A
OUT1B
SENSE1
GND
OUT2A
GND
OUT2B
SENSE2
100 μF
4986-DS
1 page  
A4986
DMOS Dual Full-Bridge PWM Motor Driver
with Overcurrent Protection
THERMAL CHARACTERISTICS may require derating at maximum conditions
Characteristic
Symbol
Test Conditions*
Package Thermal Resistance
RθJA LP package; on 4-layer PCB, based on JEDEC standard
*In still air. Additional thermal information available on Allegro Web site.
Value Units
28 ºC/W
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
20
Maximum Power Dissipation, PD(max)
(R
θJA = 28 ºC/W)
40 60 80 100 120 140 160 180
Temperature (°C)
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5 Page 
A4986
DMOS Dual Full-Bridge PWM Motor Driver
with Overcurrent Protection
100.0
66.7
Phase 1
(%)
0
–66.7
–100.0
Step Sequencing Diagrams
100.0
66.7
Phase 1
(%)
0
–66.7
–100.0
100.0
66.7
Phase 2
(%)
0
–66.7
–100.0
Full step 2 phase
Modified full step 2 phase
100.0
66.7
Phase 2
(%)
0
–66.7
–100.0
Half step 2 phase
Modified half step 2 phase
Figure 5. Step Sequencing for Full-Step Increments.
Figure 6. Step Sequencing for Half-Step Increments.
Allegro MicroSystems, Inc.
11
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet A4986.PDF ] | |
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