SLUUCK0A September   2023  – June 2026 ISO5451 , ISO5451-Q1 , ISO5452 , ISO5452-Q1 , ISO5851 , ISO5851-Q1 , ISO5852S , ISO5852S-EP , ISO5852S-Q1 , UCC21710 , UCC21710-Q1 , UCC21732 , UCC21732-Q1 , UCC21736-Q1 , UCC21739-Q1 , UCC21750 , UCC21750-Q1 , UCC21759-Q1

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specifications
    4. 1.4 General TI High Voltage Evaluation User Safety Guidelines
  6. 2Hardware
    1. 2.1 Module and Gate Driver Compatibility
      1. 2.1.1 Supported Wolfspeed Modules and Evaluation Platforms
      2. 2.1.2 Supported Gate Drivers
    2. 2.2 System Overview and Functions
      1. 2.2.1 PCB Pinout
      2. 2.2.2 Block Diagram
        1. 2.2.2.1 Primary-Side Power
        2. 2.2.2.2 Primary-Side I/O and Diagnostics
        3. 2.2.2.3 Secondary-Side Bias Supply
        4. 2.2.2.4 Output Stage Gate Loop
        5. 2.2.2.5 Current Booster
        6. 2.2.2.6 Short-Circuit Detection System
          1. 2.2.2.6.1 Short-Circuit Detection - DESAT
          2. 2.2.2.6.2 Short-Circuit Detection - OC
        7. 2.2.2.7 Temperature-Sense System
    3. 2.3 Test Setups and Procedures
      1. 2.3.1 Equipment List
      2. 2.3.2 Power-On and Bias Supply Check
      3. 2.3.3 Output Switching
      4. 2.3.4 AIN-APWM Test
  7. 3Implementation Results
    1. 3.1 EVM Example Measurements
      1. 3.1.1 Short-Circuit Testing
        1. 3.1.1.1 OC Variant: Normal Switching vs Short Circuit Soft Turn-Off
        2. 3.1.1.2 DESAT Variant: Normal Switching vs Short Circuit Soft Turn-Off
      2. 3.1.2 Analog Sensing
    2. 3.2 EVM Tuning
      1. 3.2.1 Adjust Power Supplies
        1. 3.2.1.1 Adjust VDD Bias Supply
        2. 3.2.1.2 Adjust VEE Bias Supply
        3. 3.2.1.3 Switch to Unipolar Bias Supply
        4. 3.2.1.4 Bypass VDD LDO
      2. 3.2.2 Adjust Drive Strength
        1. 3.2.2.1 Without Booster
        2. 3.2.2.2 Enabling/Disabling Booster Stage
      3. 3.2.3 Adaptations for Other ISO5x5x / UCC217xx Variants
        1. 3.2.3.1 Adapting EVM for UCC21732/39
        2. 3.2.3.2 Adapting EVM for UCC21737
        3. 3.2.3.3 Adapting EVM for ISO5451/ISO5851
  8. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layouts
    3. 4.3 Bill of Materials (BOM)
  9. 5Additional Information
    1. 5.1 Trademarks
  10. 6Revision History

3.2.1.3 Switch to Unipolar Bias Supply

One option is to switch the secondary side bipolar power supply to a unipolar power supply. The high side and low side are separately adjustable. To change the high-side gate driver to a unipolar power supply, short R10 and remove R15; to change the low-side gate driver to a unipolar power supply, short R31 and remove R36.

Be aware that VDD-COM must be below 19V when this board is used to drive SiC modules of Wolfspeed, as 19V is the absolute maximum Vgs for the module. If this method is used to change the bipolar supply to a unipolar supply, either reduce the VIN to below 11.3V or regulate the voltage by using the U4 and U5 LDO. Otherwise, the gate-source voltage is likely to exceed the maximum operating value of the Wolfspeed SiC MOSFET module.