SLUUD68 December   2024

 

  1.   1
  2.   Abstract
  3. 13
  4. 1General TI High Voltage Evaluation User Safety Guidelines
  5. 2Module Compatibility
    1. 2.1 Supported Wolfspeed Modules and Evaluation Platforms
  6. 3System Overview and Functions
    1. 3.1 Features
    2. 3.2 Specifications
    3. 3.3 PCB Pinout
    4. 3.4 Device Information
      1. 3.4.1 Primary-Side Power
      2. 3.4.2 Primary-Side I/O and Diagnostics
      3. 3.4.3 Secondary-Side Bias Supply
      4. 3.4.4 Output Stage Gate Loop
      5. 3.4.5 Short-Circuit Detection - DESAT
  7. 4Using the EVM
    1. 4.1 Equipment List
    2. 4.2 Test Setups and Procedures
      1. 4.2.1 Power-On and Bias Supply Check
      2. 4.2.2 Output Switching
  8. 5EVM Example Measurements
    1. 5.1 DESAT Functionality Testing
  9. 6EVM Tuning
    1. 6.1 Adjust Power Supplies
      1. 6.1.1 Adjust Only VDD Bias Supply
      2. 6.1.2 Adjust VDD and VEE Bias Supplies Simultaneously
      3. 6.1.3 Switch to Unipolar Bias Supply
      4. 6.1.4 Bypass VDD LDO
    2. 6.2 Adjust Drive Strength
    3. 6.3 Adjust Soft Turn-off Strength
  10. 7Hardware Design Files
    1. 7.1 Schematics
    2. 7.2 PCB Layouts
    3. 7.3 Bill of Materials (BOM)
  11. 8Additional Information
    1. 8.1 Trademarks
  12. 9Revision History

3.4.1 Primary-Side Power

The primary-side power supply block fulfills the following functions:

  • Provides +12-V input to the board via the connector or the test point hooks.
  • Converts the +12-V input voltage to +5-V VCC for the gate drivers. This functionality is realized by a TPS7A25 LDO.
  • Uses an ACM4520 common-mode choke to filter out common-mode noise.

    The +12-V power supply and the PWM signals should be connected to the same board, either the differential board or the EVM. Failure to do so might result in EVM component damage.

    UCC2189X5YQEVM-096 Primary-Side Power Figure 3-1 Primary-Side Power