SLUUD39B May   2024  – November 2024 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 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
  8. 4Hardware Design Files
    1. 4.1 Assembly and Printed Circuit Board (PCB)
    2. 4.2 Bill of Materials (BOM)
  9. 5Additional Information
    1. 5.1 Trademarks
  10. 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.

UCC33421EVM-092 UCC33421-Q1 Inrush current , sequence VINP=5.0V → EN=5.0V, VCC=5.0V, Iout=0mA Figure 3-10 UCC33421-Q1 Inrush current , sequence VINP=5.0V → EN=5.0V, VCC=5.0V, Iout=0mA
UCC33421EVM-092 UCC33411-Q1 Inrush current , sequence VINP=5.0V → EN=5.0V, VCC=3.3V, Iout=0mA Figure 3-11 UCC33411-Q1 Inrush current , sequence VINP=5.0V → EN=5.0V, VCC=3.3V, Iout=0mA
UCC33421EVM-092 UCC33421-Q1 Inrush current, sequence VINP=5.0V → EN=5.0V, VCC=5.0V, Rload=18Ω Figure 3-12 UCC33421-Q1 Inrush current, sequence VINP=5.0V → EN=5.0V, VCC=5.0V, Rload=18Ω
UCC33421EVM-092 UCC33411-Q1 Inrush current, sequence VINP=5.0V → EN=5.0V, VCC=3.3V, Rload=10Ω Figure 3-13 UCC33411-Q1 Inrush current, sequence VINP=5.0V → EN=5.0V, VCC=3.3V, Rload=10Ω