TIDUF39 March   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 DAC70502: Dual-Channel, 1-LSB INL, 14-Bit, SPI Voltage-Output Digital-to-Analog Converter (DAC)
      2. 2.3.2 INA818: 35μV Offset, 8nV/√Hz Noise, Low-Power, Precision Instrumentation Amplifier
      3. 2.3.3 OPA192: High-Voltage, Rail-to-Rail Input/Output, 5µV, 0.2µV/°C, Precision Operational Amplifier
      4. 2.3.4 LM5146: 100V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range
  9. 3System Design Theory
    1. 3.1 Constant Current Control Design
    2. 3.2 Constant Current and Voltage Simulation
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
    2. 4.2 Software Requirements
    3. 4.3 Test Setup
      1. 4.3.1 Constant Current Test Setup
      2. 4.3.2 Constant Voltage Test Setup
    4. 4.4 Test Results
      1. 4.4.1 Current Control Accuracy
      2. 4.4.2 Voltage Control Accuracy
      3. 4.4.3 CC, CV Transformation
      4. 4.4.4 Constant Current Transient Response
      5. 4.4.5 Constant Voltage Transient Response
      6. 4.4.6 Voltage Ripple at Short Circuit
      7. 4.4.7 Tracking DC-DC output
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
    2. 5.2 Tools and Software
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5. 5.5 Trademarks
  12. 6About the Author

4.2 Software Requirements

In this reference design, the reference signal for current and voltage loops uses the DAC70502, 14-bit DAC, which is programmed using the USB2ANY interface adapter.

Use the following steps for the initial setup of a new USB2ANY device:

  1. Open the USB2ANY Explorer
  2. Click and hold the button inside the small hole of the USB2ANY before plugging the device into the computer
  3. The software prompts for an update after the device is plugged in
  4. Confirm the software update
  5. Release the button

USB2ANY sets up the device properly.

Use the following steps to configure the DAC:

  1. Open the USB2Any Explorer
  2. Click the Select Interfaces button. The Select Interfaces window opens
  3. Select SPI
  4. Close the Select Interfaces window
  5. In the USB2Any Explorer window, select SPI above activity logging. If the SPI tab is not shown, click around the space above activity logging because the tabs can be hidden.
  6. Write data code into the terminal to generate the desired output parameter

Figure 4-2 shows the GUI parameters for the setup.

TIDA-010089 USB2ANY Configuration Figure 4-2 USB2ANY Configuration