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CS, RMP, and ADV Resistor Selection
13
SLVUB95C – December 2017 – Revised August 2018
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Copyright © 2017–2018, Texas Instruments Incorporated
DRV10974 Evaluation Module
7.2
RMP Resistor Table
The RMP resistor controls the open-loop start-up acceleration, closed-loop acceleration, and closed-loop
deceleration. More information can be found in
DRV10974 12-V, Three-Phase, Sensorless BLDC Motor
Driver
. The default resistor on the DRV10974EVM is 7.32 k
Ω
, which sets the second-order acceleration
coefficient, the first-order acceleration coefficient, the closed-loop acceleration, and the closed-loop
deceleration to 0.22 Hz/s
2
, 4.6 Hz/s, 2.7 s, and 44 s, respectively. This is the slowest ramp rate.
Table 6. RMP Resistor Table
RMP
SELECTION
R
RMP
[k
Ω
]
ACCEL2 [Hz/s
2
]
ACCEL1 [Hz/s]
CLOSED-LOOP-
ACCELERATION
TRANSITION TIME [s]
CLOSED-LOOP-
DECELERATION
TRANSITION TIME [s]
0
7.32
0.22
4.6
2.7
44
1
10.7
1.65
9.2
2.7
22
2
14.3
1.65
15
1
22
3
17.8
3.3
25
1
11
4
22.1
7
25
0.2
44
5
28
7
35
0.2
22
6
34
14
50
0.2
22
7
41.2
27
75
0.2
11
8
49.9
27
75
5.4
11
9
59
14
50
8
22
10
71.5
7
35
11
22
11
86.6
7
25
22
44
12
105
3.3
25
5.4
11
13
124
1.65
15
8
22
14
150
1.65
9.2
11
22
15
182
0.22
4.6
22
44
7.3
ADV Resistor Table
The ADV resistor controls the lead time in order to drive the motor with the best efficiency. More
information can be found in
DRV10974 12-V, Three-Phase, Sensorless BLDC Motor Driver
. The default
resistor on the DRV10974EVM is 59 k
Ω
, which sets the lead time to 400 µs.
Table 7. ADV Resistor Table
R
ADV
[k
Ω
]
LEAD TIME [µs]
10.7
10
14.3
25
17.8
50
22.1
100
28
150
34
200
41.2
250
49.9
300
59
400
71.5
500
86.6
600
105
700
124
800
150
900
182
1000
