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DRV8426PWPR Datasheet(PDF) 14 Page - Texas Instruments

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Part # DRV8426PWPR
Description  DRV8426 Stepper Driver With Integrated Current Sense, 1/256 Microstepping, STEP/DIR Interface and smart tune Technology
PDF  49 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

DRV8426PWPR Datasheet(HTML) 14 Page - Texas Instruments

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DRV8426
SLOSE55 – MAY 2020
www.ti.com
Product Folder Links: DRV8426
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Copyright © 2020, Texas Instruments Incorporated
Table 5. Relative Current and Step Directions (continued)
1/8 STEP
1/4 STEP
1/2 STEP
FULL
STEP
71%
AOUT CURRENT
(% FULL-SCALE)
BOUT CURRENT
(% FULL-SCALE)
ELECTRICAL
ANGLE
(DEGREES)
25
13
7
-100%
0%
270.00
26
-98%
20%
281.25
27
14
-92%
38%
292.50
28
-83%
56%
303.75
29
15
8
4
-71%
71%
315.00
30
-56%
83%
326.25
31
16
-38%
92%
337.50
32
-20%
98%
348.75
Table 6 shows the full step operation with 100% full-scale current. This stepping mode consumes more power
than full-step mode with 71% current, but provides a higher torque at high motor RPM.
Table 6. Full Step with 100% Current
FULL
STEP
100%
AOUT CURRENT
(% FULL-SCALE)
BOUT CURRENT
(% FULL-SCALE)
ELECTRICAL ANGLE
(DEGREES)
1
100
100
45
2
-100
100
135
3
-100
-100
225
4
100
–100
315
Table 7 shows the noncircular 1/2–step operation. This stepping mode consumes more power than circular 1/2-
step operation, but provides a higher torque at high motor RPM.
Table 7. Non-Circular 1/2-Stepping Current
NON-CIRCULAR 1/2-STEP
AOUT CURRENT
(% FULL-SCALE)
BOUT CURRENT
(% FULL-SCALE)
ELECTRICAL ANGLE
(DEGREES)
1
0
100
0
2
100
100
45
3
100
0
90
4
100
–100
135
5
0
–100
180
6
–100
–100
225
7
–100
0
270
8
–100
100
315
7.3.4 Controlling VREF with an MCU DAC
In some cases, the full-scale output current may need to be changed between many different values, depending
on motor speed and loading. The voltage of the VREF pin can be adjusted in the system to change the full-scale
current.
In this mode of operation, as the DAC voltage increases, the full-scale regulation current increases as well. For
proper operation, the output of the DAC should not rise above 3.3V for DRV8426.



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