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

2.1.5 Oscilloscope Probes: Probing the EVM

Using TP3 and TP6 Oscilloscope Probe PCB Test Points

The UCC33421-Q1 is a high frequency DC-DC module that requires careful measurement for accurately capturing transient events and measuring high frequency, AC ripple voltage. Remove the witch hat probe tip cover and ground lead from the scope probe. If scope probe ground springs are not available, then wrap a piece of 22 AWG bare wire around the scope probe ground ring or use a fitted ground spring and insert the probe tip and ground into the EVM as shown in Figure 2-2.

UCC33421EVM-092 PCB Scope Probe Test Points Figure 2-2 PCB Scope Probe Test Points

The EVM input (VINP, GNDP) and output nomenclature (VCC, GNDS) corresponds to what is commonly used when referring to isolated amplifiers that need to be biased from primary and secondary sides.