SLVUB95C December   2017  – August 2018

 

  1.   DRV10974 Evaluation Module
    1.     Trademarks
    2. 1  DRV10974 EVM Kit Contents
    3. 2  Introduction
      1. 2.1 Features
    4. 3  Quick Start Guide
    5. 4  DRV10974 Onboard Connections
      1. 4.1 Connector (P1) for Power Input
      2. 4.2 Interface Connector (P2) for Phase Windings of Motor
    6. 5  DRV10974 Package
    7. 6  User Interface
      1. 6.1 Jumpers
      2. 6.2 Switch
      3. 6.3 Test Points
    8. 7  CS, RMP, and ADV Resistor Selection
      1. 7.1 CS Resistor Table
      2. 7.2 RMP Resistor Table
      3. 7.3 ADV Resistor Table
    9. 8  Schematic
    10. 9  Bill of Materials (BOM)
    11. 10 EVM Documentation
  2.   Revision History

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 kΩ, 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/s2, 4.6 Hz/s, 2.7 s, and 44 s, respectively. This is the slowest ramp rate.

Table 6. RMP Resistor Table

RMP SELECTION RRMP [kΩ] ACCEL2 [Hz/s2] 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