SBAA586 October   2023 AMC23C11 , UCC23513

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2System Challenge on Isolated Gate Drivers With Integrated DESAT
  6. 3System Approach With UCC23513 and AMC23C11
    1. 3.1 System Overview and Key Specification
    2. 3.2 Schematic Design
      1. 3.2.1 Circuit Schematic
      2. 3.2.2 Configure VCE(DESAT) Threshold and DESAT Bias Current
      3. 3.2.3 DESAT Blanking Time
      4. 3.2.4 DESAT Deglitch Filter
    3. 3.3 Reference PCB Layout
  7. 4Simulation and Test Results
    1. 4.1 Simulation Circuit and Results
      1. 4.1.1 Simulation Circuit
      2. 4.1.2 Simulation Results
    2. 4.2 Test Results With 3-Phase IGBT Inverter
      1. 4.2.1 Brake IGBT Test
      2. 4.2.2 Test Results on a 3-Phase Inverter With Phase to Phase Short
  8. 5Summary
  9. 6References
  10. 7Revision History

5 Summary

The combination of a compact, isolated simple gate driver with an isolated comparator for DESAT protection has been validated in this application note. The discrete approach reduces the design size compared to a 16-pin smart gate driver with integrated DESAT. This approach also adds flexibility to configure the key parameters for the DESAT function such as threshold, bias current, blanking time, and deglitch filter. The discrete approach also offers a DESAT latch function which can be reset by the MCU too.

This concept can also be expanded to bipolar gate driver supplies, and is equally fitting for both low-side and high-side gate drivers. For more details on these applications, refer to TIDA-00448.