A3980KLP View Datasheet(PDF) - Allegro MicroSystems
Part Name
Description
MFG CO.
'A3980KLP' PDF : 18 Pages View PDF
A3980
Automotive DMOS Microstepping Driver
with Translator
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 ITripMAX 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)
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Recommended
RS(Ω)
1.00
VREF (V)
0.8
1.00
1.6
1.00
2.4
1.00
3.2
1.00
4.0
0.83
4.0
0.71
4.0
0.63
4.0
0.56
4.0
0.50
4.0
Allegro MicroSystems, Inc.
16
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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