A3980 datasheet(16/18 Pages) ALLEGRO

16 / 18 page

Automotive DMOS Microstepping Driver

with Translator

A3980

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

Current Sensing. To minimize inaccuracies caused by

ground-trace IR drops in sensing the output current level,

the current-sense resistors (RS1 and RS2) should have an

independent ground return to the star ground point. This path

should be as short as possible. For low-value sense resistors,

the IR drops in the printed circuit board sense resistor traces

can be signiﬁcant and should be taken into account. The use

of sockets should be avoided as they can introduce variation

in RS due to their contact resistance.

The recommended value of the sense resistor, RS (Ω), is

given by

RS = 0.5 / ITripMAX

up to a maximum of 1 Ω for I

TripMAX of 0.5 A. Below 0.5 A,

RS should be 1 Ω, and VREF reduced accordingly, as shown

in the following table.

IMAX (A)

Recommended

RS(Ω)VREF(V)

0.1

1.00

0.8

0.2

1.00

1.6

0.3

1.00

2.4

0.4

1.00

3.2

0.5

1.00

4.0

0.6

0.83

4.0

0.7

0.71

4.0

0.8

0.63

4.0

0.9

0.56

4.0

1.0

0.50

4.0

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