SLVAG18 April   2025 TPSI3100 , TPSI3100-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Why DESAT Protection Is Needed
    1. 1.1 Key Considerations for DESAT Protection
  5. 2Key DESAT Circuit Components
    1. 2.1 Circuit Startup Behavior
  6. 3Design Example
    1. 3.1 Design Requirements
    2. 3.2 Threshold Equations
    3. 3.3 Given Parameters
    4. 3.4 Inserting Given Parameters into Equations
    5. 3.5 Solving Equations for Unknowns
    6. 3.6 Selecting Resistances to Satisfy Equations
    7. 3.7 Determining Blanking Capacitance
    8. 3.8 Final Component Values
    9. 3.9 Lab Testing
  7. 4Closing

4 Closing

Proper implementation of DESAT protection enhances the reliability and lifespan of SiC MOSFETs and IGBTs by preventing destructive oversaturation. By carefully selecting an isolated gate driver like TPSI3133 with DESAT protection and calculating component values, designers can optimize around speed while also preventing false positives. The article walks through an example of how to select components to meet specific DESAT design requirements. Engineers can use DESAT protection for their power semiconductors against overcurrent events, ensuring efficiency and long-term performance in high-power applications.