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

2.1.2 External Connections for Easy Evaluation

The UCC33421EVM-092 EVM utilizes screw terminals for easily connecting to VINP and VCC. EN connections are made through pin connectors. Connecting the appropriate ammeters and voltmeters, as shown in Figure 4‑1, allows accurate EVM efficiency measurements.

Connecting Test Equipment:

  1. Connect the VINP DC power supply capable of 4.5V<VINP<5.5V, 1A at J1:1-2 (VINP-GNDP). With the power supply disable, adjust the power supply to 5.0V, and set the current limit to 4A.
  2. Connect a power supply capable of 5V, 100mA or a function generator at J2:2-1 to serve as the pull up bias for EN/FLT. With the supply disabled, set to 3.3V/5.0V. As an option, the user can use the input power supply as a bias supply connecting a jumper to short +VINP and EN pins at J2:1-2 (top left corner).
  3. Connect a variable load between J3:1 (VCC) and J3:2 (GNDS). If using an electronic load, then set to constant current (CC), 300mA. Leave the load disabled until the EVM is powered.
  4. Some electronic loads are not able to regulate or stabilize CC when setting in the low mA range. Monitor the input current and load currents by inserting ammeters as shown in Figure 2-1. A current probe can be used with the oscilloscope to verify the stability of the DC current being regulated by an electronic load.
UCC33421EVM-092 Typical Efficiency Measurement Setup Figure 2-1 Typical Efficiency Measurement Setup