SLUUD39C May   2024  – August 2025 UCC33411-Q1 , UCC33421-Q1

 

  1.   1
  2.   Description
  3.   Features
    1.     Applications
  4.   5
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Device Information
      1. 1.3.1 U1 Component Selection
      2. 1.3.2 UCC33421-Q1 Pin Definition
    4. 1.4 Specification
  6. 2Hardware
    1. 2.1 EVM Setup and Operation
      1. 2.1.1 Recommended Test Equipment
      2. 2.1.2 External Connections for Easy Evaluation
      3. 2.1.3 Powering the EVM
        1. 2.1.3.1 Power on for Start-up
        2. 2.1.3.2 Power off for Shutdown
      4. 2.1.4 EVM Test Points
      5. 2.1.5 Oscilloscope Probes: Probing the EVM
  7. 3Implementation Results
    1. 3.1 Performance Data
      1. 3.1.1 Efficiency Data
      2. 3.1.2 Regulation Data
      3. 3.1.3 Startup Waveforms
      4. 3.1.4 Inrush Current
      5. 3.1.5 AC Ripple Voltage
      6. 3.1.6 Load Transient
      7. 3.1.7 VCC Short-Circuit
      8. 3.1.8 Thermal Performance
  8. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 Assembly and Printed Circuit Board (PCB)
    3. 4.3 Bill of Materials (BOM)
  9. 5Additional Information
    1. 5.1 Trademarks
  10. 6Revision History

3.1.7 VCC Short-Circuit

Short circuit is applied with an electronic load. FLT pin is pulled down during 200μs and the device tries to restart after 160ms as shown in the waveform below. Device restarts successfully after short circuit is released.

UCC33421EVM-092 UCC33421-Q1 Short circuit, VINP=5.0V, VCC=5.0V Figure 3-21 UCC33421-Q1 Short circuit, VINP=5.0V, VCC=5.0V
UCC33421EVM-092 UCC33411-Q1 Short circuit, VINP=5.0V, VCC=3.3V Figure 3-22 UCC33411-Q1 Short circuit, VINP=5.0V, VCC=3.3V