SDAA444 October   2026 UCC23711

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Opto-Input Isolated Protection Gate Driver for SiC and IGBT
  6. 3Three Phase IGBT Inverter Design Guidelines for UCC23711
    1. 3.1 Overview
    2. 3.2 UCC23711 Input Current Resistor Configuration
    3. 3.3 UCC23711 Gate Drive Turn-on and Turn-off Peak Current
    4. 3.4 UCC23711 Active Miller Clamp
    5. 3.5 UCC23711 Supply Decoupling and Requirements
      1. 3.5.1 Input Side
      2. 3.5.2 Output Side
      3. 3.5.3 Output Supply Current
    6. 3.6 DESAT Circuit Configuration
    7. 3.7 UCC23711 Fault (FLT) Feedback
  7. 4System Test Results
    1. 4.1 Three-Phase IGBT Inverter under Test
    2. 4.2 UCC23711 Input Current Thresholds and Hysteresis
    3. 4.3 UCC23711 Propagation Delay
    4. 4.4 Phase U Turn-On and Turn-Off Slew Rates
    5. 4.5 UCC23711 Miller Clamp and Unipolar 15V Supply
    6. 4.6 UCC23711 DESAT Response and Soft Shut Down
    7. 4.7 Increasing the DESAT Charge Current
    8. 4.8 UCC23711 VDD UVLO Thresholds and Gate Drive Output
    9. 4.9 UCC23711 Gate Drive Power Consumption
  8. 5Summary
  9. 6References

5 Summary

This document provides circuit design guidelines for enhancing 3-phase IGBT inverter robustness using UCC23711 and UCC23710 isolated gate drivers featuring configurable DESAT (6.5V/9V). It details the optimization of input resistor configurations, peak output currents, DESAT protection, active Miller clamping, and supply decoupling for both unipolar and bipolar setups. All design parameters are validated via empirical testing on a 3-phase IGBT inverter prototype at a 550V DC bus. Leveraging SiO₂ isolation and opto-compatible inputs, the UCC23711 and UCC23710 gate drivers enable seamless integration into legacy optocoupler applications, while offering lower propagation delay and higher CMTI.