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A4988 の電気的特性と機能

A4988のメーカーはAllegroです、この部品の機能は「DMOS Microstepping Driver」です。


製品の詳細 ( Datasheet PDF )

部品番号 A4988
部品説明 DMOS Microstepping Driver
メーカ Allegro
ロゴ Allegro ロゴ 




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A4988 Datasheet, A4988 PDF,ピン配置, 機能
A4988
DMOS Microstepping Driver with Translator
and Overcurrent Protection
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
▪ Crossover-current protection
▪ 3.3 and 5 V compatible logic supply
▪ Thermal shutdown circuitry
▪ Short-to-ground protection
▪ Shorted load protection
▪ Five selectable step modes: full, 1/2, 1/4, 1/8, and 1/16
Package:
28-contact QFN
with exposed thermal pad
5 mm × 5 mm × 0.90 mm
(ET package)
Not to scale
Description
The A4988 is a complete microstepping motor driver with
built-in translator for easy operation. It is designed to operate
bipolar stepper motors in full-, half-, quarter-, eighth-, and
sixteenth-step modes, with an output drive capacity of up to
35 V and ±2 A. The A4988 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
A4988. Simply inputting one pulse on the STEP input drives
the motor one microstep. There are no phase sequence tables,
high-frequency control lines, or complex interfaces to program.
The A4988 interface is an ideal fit for applications where a
complex microprocessor is unavailable or is overburdened.
During stepping operation, the chopping control in the A4988
automatically selects the current decay mode: slow or mixed. In
mixed decay mode, the device is set initially to a fast decay for
a proportion of the fixed off-time, then to a slow decay for the
remainder of the off-time. Mixed decay current control results
in reduced audible motor noise, increased step accuracy, and
reduced power dissipation.
Continued on the next page…
Microcontroller or
Controller Logic
Typical Application Diagram
VDD
0.22 µF
0.1 µF
0.1 µF
0.22 µF
5 kΩ
VREG ROSC CP1 CP2 VCP VBB1
VDD
VBB2
SLEEP
STEP
MS1
MS2
MS3
DIR
ENABLE
RESET
VREF
A4988
OUT1A
OUT1B
SENSE1
GND
OUT2A
OUT2B
SENSE2
GND
4988-DS, Rev. 6
100 µF

1 Page





A4988 pdf, ピン配列
A4988
DMOS Microstepping Driver with Translator
and Overcurrent Protection
Functional Block Diagram
VREG
0.22 µF
ROSC
0.1 µF
CP1 CP2
VDD
Current
Regulator
OSC
Charge
Pump
VCP
REF
DAC
STEP
DIR
RESET
MS1
MS2
MS3
ENABLE
SLEEP
Translator
DAC
PWM Latch
Blanking
Mixed Decay
Control
Logic
PWM Latch
Blanking
Mixed Decay
DMOS Full Bridge
OCP
Gate
Drive
DMOS Full Bridge
OCP
VBB1
OUT1A
OUT1B
SENSE1
VBB2
OUT2A
OUT2B
SENSE2
VREF
0.1 µF
RS1
RS2
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3


3Pages


A4988 電子部品, 半導体
A4988
DMOS Microstepping Driver with Translator
and Overcurrent Protection
STEP
MS1, MS2, MS3,
RESET, or DIR
tA
tC tD
tB
Time Duration
Symbol Typ.
STEP minimum, HIGH pulse width
STEP minimum, LOW pulse width
Setup time, input change to STEP
Hold time, input change to STEP
tA 1
tB 1
tC 200
tD 200
Figure 1: Logic Interface Timing Diagram
Unit
μs
μs
ns
ns
Table 1: Microstepping Resolution Truth Table
MS1 MS2 MS3 Microstep Resolution Excitation Mode
L L L Full Step
2 Phase
H L L Half Step
1-2 Phase
L H L Quarter Step
W1-2 Phase
H H L Eighth Step
2W1-2 Phase
H H H Sixteenth Step
4W1-2 Phase
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6

6 Page



ページ 合計 : 20 ページ
 
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共有リンク

Link :


部品番号部品説明メーカ
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A4986

DMOS Dual Full-Bridge PWM Motor Driver

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A4988

DMOS Microstepping Driver

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