SLUUCZ9C January   2024  – December 2024

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 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 UCC33420-Q1 Pin Definition
    4. 1.4 Specification
  7. 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
      4. 2.1.4 EVM Test Points
      5. 2.1.5 Oscilloscope Probes: Probing the EVM
  8. 3Implementation Results
    1. 3.1 Schematic
    2. 3.2 Performance Data
      1. 3.2.1 Efficiency Data
      2. 3.2.2 Regulation Data
      3. 3.2.3 Startup Waveforms
      4. 3.2.4 Inrush Current
      5. 3.2.5 AC Ripple Voltage
      6. 3.2.6 Load Transient
      7. 3.2.7 VCC Short-Circuit
      8. 3.2.8 Thermal Performance
  9. 4Hardware Design Files
    1. 4.1 Assembly and Printed Circuit Board (PCB)
    2. 4.2 Bill of Materials (BOM)
  10. 5Additional Information
    1. 5.1 Trademarks
  11. 6Revision History

3.2.4 Inrush Current

Inrush current measurements made with VINP applied first, then toggling EN pin second. The input capacitors are pre-biased to VINP and make negligible contribution to the measured inrush current.

UCC33420Q1-EVM UCC33420-Q1 Inrush current , sequence VINP=5.0V → EN=5.0V, VCC=5.0V, Iout=0mA Figure 3-10 UCC33420-Q1 Inrush current , sequence VINP=5.0V → EN=5.0V, VCC=5.0V, Iout=0mA
UCC33420Q1-EVM UCC33020-Q1 Inrush current , sequence VINP=3.3V → EN=5.0V, VCC=5.0V, Iout=0mA Figure 3-11 UCC33020-Q1 Inrush current , sequence VINP=3.3V → EN=5.0V, VCC=5.0V, Iout=0mA
UCC33420Q1-EVM UCC33420-Q1 Inrush current, sequence VINP=5.0V → EN=5.0V, VCC=5.0V, Rload=18Ω Figure 3-12 UCC33420-Q1 Inrush current, sequence VINP=5.0V → EN=5.0V, VCC=5.0V, Rload=18Ω
UCC33420Q1-EVM UCC33020-Q1 Inrush current, sequence VINP=3.3V → EN=5.0V, VCC=5.0V, Rload=50Ω Figure 3-13 UCC33020-Q1 Inrush current, sequence VINP=3.3V → EN=5.0V, VCC=5.0V, Rload=50Ω