SLUUD88 April   2025

 

  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 Specification
    4. 1.4 Device Information
  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
    2. 2.2 Test Points
    3. 2.3 Oscilloscope Probe Points
  8. 3Hardware Design Files
    1. 3.1 Schematic
    2. 3.2 Assembly and Printed Circuit Board (PCB) Layout
    3. 3.3 Bill of Materials (BOM)
  9. 4Additional Information
    1. 4.1 Trademarks

2.1.2 External Connections for Easy Evaluation

The UCC34141EVM-116 EVM utilizes screw terminals for quickly connecting to VIN, VDD and VEE. Connecting the appropriate ammeters and voltmeters, as shown in Figure 2-1, allows accurate EVM efficiency measurements to be made.

Connecting Test Equipment:

  1. Move shunt jumper, SH-J1 into the J2, 1-2, EN OFF position. This assures the EVM cannot start while test equipment is being connected.
  2. Connect a +5V DC bias power supply J1:1-2 (adjust to +3.3V to +5V). The +5V supply at J1 will serve as the pullup bias for /PG and ENA. Turn off/disable the +5V DC Bias power supply.
  3. Connect the VIN DC power supply capable of 5V<VIN<20V, 500mA at J3:1-2 (VIN). Adjust the power supply to 12V, and set the current limit to 1A. Turn off/disable the VIN power supply.
  4. Connect a variable load between J4:1 (VDD) and J4:2 (COM). If using an electronic load, set to constant resistance (CR), 650Ω (~500mW). Leave the load disabled until the EVM is powered.
  5. Connect a second load between J4:2 (COM) and J4:3 (VEE). If using an electronic load, set to constant resistance (CR), 250Ω (~10mW). Leave the load disabled until the EVM is powered. Since the required load is small, a through-hole, 500mW, load resistor can be connected between J4:2-3.
  6. Some electronic loads may not be able to regulate/stabilize CC when setting in the low mA range. Monitor the input current and load currents by inserting ammeters as shown in Figure 4-1. A current probe can be used with the oscilloscope to verify the stability of the DC current being regulated by an electronic load.

UCC34141EVM-116 Typical Efficiency Measurement Setup Figure 2-1 Typical Efficiency Measurement Setup