DRV8886AT Datasheet, PDF (24/40 Pages) Texas Instruments – 2-A Stepper Motor Driver With Integrated Current Sense and AutoTune Technology

DRV8886AT
SLVSDO1 – JANUARY 2017
www.ti.com
7.3.7 Blanking Time
After the current is enabled in an H-bridge, the current sense comparator is ignored for a period of time (t_BLANK)
before enabling the current-sense circuitry. The blanking time also sets the minimum drive time of the PWM.
Table 7 shows the blanking time based on the sine table index and the torque DAC setting. In the AutoTune
current regulation modes the blanking time is fixed at 1.0 µs. Please note that the torque DAC index is not the
same as one step as given in Table 3.
Table 7. Adaptive Blanking
Time over Torque DAC and
Microsteps
t_blank = 1.5 µs
t_blank = 1.0 µs
SINE INDEX
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
100%
100%
98%
96%
92%
88%
83%
77%
71%
63%
56%
47%
38%
29%
20%
10%
0%
TORQUE DAC (TRQ)
75%
75%
73.5
72%
69%
66%
62.3%
57.8%
53.3%
47.3%
42%
35.3
28.5
21.8%
15%
7.5%
0%
50%
50%
49%
48%
46%
44%
41.5%
38.5%
35.5%
31.5%
28%
23.5%
19%
14.5%
10%
5%
0%
24
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