Datasheet > A4982_V4

A4982_V4

更新时间： 2022-10-08 09:30:16

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器转换器
页数	文件大小	规格书
20页	472K
描述
DMOS Microstepping Driver with Translator And Overcurrent Protection

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A4982_V4 数据手册

A4982

DMOS Microstepping Driver with Translator

And Overcurrent Protection

Features and Benefits

▪ Low R_DS(ON)outputs

Description

The A4982 is a complete microstepping motor driver with

▪ Automatic current decay mode detection/selection

▪ Mixed and Slow current decay modes

▪ Synchronous rectification for low power dissipation

▪ Internal UVLO

built-in translator for easy operation. It is designed to operate

bipolarsteppermotorsinfull-,half-,quarter-,andsixteenth-step

modes, with an output drive capacity of up to 35 V and ±2 A.

The A4982 includes a fixed off-time current regulator which

has the ability to operate in Slow or Mixed decay modes.

▪ 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

The ET package meets customer requirements for no smoke

no fire (NSNF) designs by adding no-connect pins between

critical output, sense, and supply pins. So, in the case of a

pin-to-adjacent-pin short, the device does not cause smoke

or fire. Additionally, the device does not cause smoke or fire

when any pin is shorted to ground or left open.

▪ Low current Sleep mode, < 10 μA

▪ No smoke no fire (NSNF) compliance (ET package)

The translator is the key to the easy implementation of the

A4982. Simply inputting one pulse on the STEP input drives

the motor one microstep. There are no phase sequence tables,

highfrequencycontrollines,orcomplexinterfacestoprogram.

The A4982 interface is an ideal fit for applications where a

complex microprocessor is unavailable or is overburdened.

Packages:

32-contact QFN

with exposed thermal pad

5 mm × 5 mm × 0.90 mm

Approximate size

(ET package)

During stepping operation, the chopping control in theA4982

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

24-pin TSSOP

with exposed thermal pad

(LP Package)

Continued on the next page…

Typical Application Diagram

V_DD

0.1 μF

0.22 μF

VREG ROSC CP1

VDD

CP2 VCP

VBB1

0.22 μF

100 μF

VBB2

5 kΩ

Microcontroller or

Controller Logic

SLEEP

STEP

OUT1A

A4982

OUT1B

SENSE1

MS1

MS2

DIR

OUT2A

ENABLE

RESET

OUT2B

SENSE2

VREF

GND

4982-DS Rev. 4

12 3 4 5 6 7...20

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