SNVAA20 July   2021 DRV8833 , DRV8833 , LMR33630 , LMR33630

 

  1.   Trademarks
  2. 1Introduction
  3. 2Motorized Resistive Load Architecture
    1. 2.1 Controller Board
    2. 2.2 Resistor Plate
  4. 3Motorized Resistive Load Design
    1. 3.1 Controller Board Design
      1. 3.1.1 Power Management
      2. 3.1.2 Power Converter Selection
      3. 3.1.3 Interface and ADC Selection
    2. 3.2 Resistor Plate Design
      1. 3.2.1 Motor and Motor Driver Selection
      2. 3.2.2 Resistor Track
      3. 3.2.3 Mechanical Arm Assembly
      4. 3.2.4 Feedback Control
  5. 4Thermal Considerations
  6. 5Performance and Results
  7. 6Summary
  8. 7Appendix
    1. 7.1 Controller Board Main Schematic
    2. 7.2 Controller Board Sub-Schematics
    3. 7.3 Resistor Plate Schematics
    4. 7.4 Python Code

5 Performance and Results

The overall design is a powerful tool that can be used to apply resistive loads. This design utilizes several different resistor values along the load resistor loop to increase the dynamic range of available load resistances. The resistance ranges of this design include a low, middle, and high range which are [0 to 1.5 Ω], [1.6 to 4.5 Ω] and [6 to 40.5 Ω]. These ranges are ideal for common voltage rails such as 1.8 V, 3.3 V and 5 V. The overall profile is shown in Figure 5-1 and a demonstration of current sinking capability is shown in Figure 5-2.

Figure 5-1 Resistance Profile
Figure 5-2 Demonstrated Load Range