DRV10983_15 Datasheet, PDF (28/57 Pages) Texas Instruments – DRV10983 12- to 24-V, Three-Phase, Sensorless BLDC Motor Driver

DRV10983
SLVSCP6B – JULY 2014 – REVISED FEBRUARY 2015
www.ti.com
Phase
Voltage
Phase
Current
Phase
BEMF
t_adv
Figure 25. Advance Time (t_adv) Definition
The DRV10983 has two options for adjusting the motor commutate advance time. When CtrlAdvMd = 0, mode 0
is selected. When CtrlAdvMd = 1, mode 1 is selected.
Mode 0: t_adv is maintained to be a fixed time relative to the estimated BEMF zero cross as determined by
Equation 3.
t_adv = t_SETTING
(3)
Mode 1: t_adv is maintained to be a variable time relative to the estimated BEMF zero cross as determined by
Equation 4.
t_adv = t_SETTING × (U-BEMF)/U.
where
• U is the phase voltage amplitude
• BEMF is phase BEMF amplitude
(4)
t_SETTING (in µs) is determined by the configuration of the TCtrlAdv [6:4] and TCtrlAdv [3:0] bits as defined in
Equation 5. For convenience, the available t_SETTING values are provided in Table 5.
t_SETTING = 2.5 µs × [TCtrlAdv[3:0]] << TCtrlAdv[6:4]
(5)
t_SETTING (µs)
0.0
2.5
5
7.5
10
12.5
15
17.5
20
22.5
25
27.5
30
32.5
35
37.5
40
45
50
Table 5. Configuring Commutation Advance Timing by Adjusting t_SETTING
TCtrlAdv
[6:0]
HEX
t_SETTING (µs)
TCtrlAdv
[6:0]
HEX
t_SETTING (µs)
TCtrlAdv
[6:0]
0000000
00
90
0101001
29
800
1011010
0000001
01
100
0101010
2A
880
1011011
0000010
02
110
0101011
2B
960
1011100
0000011
03
120
0101100
2C
1040
1011101
0000100
04
130
0101101
2D
1120
1011110
0000101
05
140
0101110
2E
1200
1011111
0000110
06
150
0101111
2F
1280
1101000
0000111
07
160
0111000
38
1440
1101001
0001000
08
180
0111001
39
1600
1101010
0001001
09
200
0111010
3A
1760
1101011
0001010
0A
220
0111011
3B
1920
1101100
0001011
0B
240
0111100
3C
2080
1101101
0001100
0C
260
0111101
3D
2240
1101110
0001101
0D
280
0111110
3E
2400
1101111
0001110
0E
300
0111111
3F
2560
1111000
0001111
0F
320
1001000
48
2880
1111001
0011000
18
360
1001001
49
3200
1111010
0011001
19
400
1001010
4A
3520
1111011
0011010
1A
440
1001011
4B
3840
1111100
HEX
5A
5B
5C
5D
5E
5F
68
69
6A
6B
6C
6D
6E
6F
78
79
7A
7B
7C
28
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