SLUSFX8 September   2026 UCC218302-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Power Ratings
    6. 5.6 Insulation Specifications
    7. 5.7 Electrical Characteristics
    8. 5.8 Switching Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  Power Supply
      2. 6.3.2  VCC Undervoltage Lockout (UVLO)
      3. 6.3.3  Input Filters for IN+, IN-, and RST/EN
      4. 6.3.4  Active Pulldown
      5. 6.3.5  Short Circuit Clamping
      6. 6.3.6  Internal Active Miller Clamp
      7. 6.3.7  Desaturation (DESAT) Protection
      8. 6.3.8  Soft Shutdown (SSD)
      9. 6.3.9  Fault (FLT), Reset, and Enable (RST/EN)
      10. 6.3.10 Output Gate Voltage Monitor
      11. 6.3.11 Active Short Circuit (ASC) Support
      12. 6.3.12 Overtemperature Protection
    4. 6.4 Device Functional Modes
  8. 7 Applications and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Application Schematic
      2. 7.2.2 Design Requirements
      3. 7.2.3 Detailed Design Procedure
        1. 7.2.3.1 Input Filters for IN+, IN-, and RST/EN
        2. 7.2.3.2 FLT, RDY, and RST/EN Pin Circuitry
        3. 7.2.3.3 Gate Driver Output Resistors
        4. 7.2.3.4 Overcurrent and Short Circuit Protection With DESAT
      4. 7.2.4 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Third-Party Products Disclaimer
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information
    1. 10.1 Mechanical Data

6.3.7 Desaturation (DESAT) Protection

The UCC218302-Q1 implements a fast overcurrent and short-circuit protection feature to protect the power semiconductor device from catastrophic breakdown during a fault. The DESAT pin threshold, VDESATTH, is with respect to COM, the source or emitter of the power semiconductor device. When the driver is in the off state, an internal MOSFET pulls down the DESAT pin to prevent DESAT from false triggering. When the driver is in the on state, an internal current source activates to charge an external capacitor. The UCC218302-Q1 features an internal leading edge blanking time after OUTHx switches to the on state to avoid false triggers from noise during the switching transient. During the leading edge blanking time period, the DESAT pin is pulled-down by the internal pulldown MOSFET. When the driver turns off, the internal pulldown MOSFET discharges the voltage of the DESAT pin. Figure 6-9 shows a simplified block diagram of the DESAT circuit. Figure 6-10 shows timing diagrams showing a DESAT fault, soft shutdown, fault reporting, and fault reset.

UCC218302-Q1 DESAT Protection Figure 6-9 DESAT Protection
UCC218302-Q1 DESAT Protection Timing Diagram with Soft Shutdown Figure 6-10 DESAT Protection Timing Diagram with Soft Shutdown