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

2.1.3 Powering the EVM

WARNING:

UCC33420Q1-EVM

  • Hot surface. Contact can cause burns. U1 package surface can reach temperatures of 100°C above ambient. Do not touch!
  • Do not test this EVM unless trained in the proper safety, handling and testing of power electronics.

Power on for Start-up:

  1. Verify VINP and VEN power supplies are off/disabled and no voltage is applied to the DUT.
  2. Verify the load on VCC is disabled.
  3. Turn on the VINP DC power supply. Verify 5V is present at TP1-to-TP2.
  4. Turn on the VEN bias power supply. EVM is now enabled with VCC in regulation under no load condition.
  5. Verify 5V present on VCC-GNDS.
  6. Enable the 300mA load on VCC.
  7. The UCC33420 is now regulating VCC and processing 1.5W of isolated output power.
  8. Vary VINP between 4.5 V<VINP<5.5 V, vary Iout between 0 mA<Iout<300 mA.
  9. Insert oscilloscope probes into TP3 and TP6 for measuring VINP and VCC startup, steady state and AC ripple voltage.

Power off for Shutdown:

  1. Turn off VEN power supply.
  2. Disable Iout load.
  3. Turn off VINP power supply.