SLUUCJ2 July   2021 UCC14240-Q1

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Pin Configuration and Functions
  3. 2Description
    1. 2.1 EVM Electrical Performance Specifications
  4. 3Schematic
  5. 4EVM Setup and Operation
    1. 4.1 Reference
    2. 4.2 External Connections for Easy Evaluation
    3. 4.3 Powering the EVM
      1. 4.3.1 Power on for Start-up
      2. 4.3.2 Power off for Shutdown
    4. 4.4 EVM Test Points
    5. 4.5 Oscilloscope Probes: Probing the EVM
  6. 5 Performance Data
    1. 5.1 Efficiency Data
    2. 5.2 Regulation Data
    3. 5.3 Start-up Waveforms
    4. 5.4 Inrush Current
    5. 5.5 AC Ripple Voltage
    6. 5.6 EN and /PG Timing
    7. 5.7 Shutdown
    8. 5.8 Steady State
    9. 5.9 Thermal Performance
  7. 6Assembly and Printed Circuit Board (PCB) Layers
  8. 7Bill of Materials (BOM)
  9. 8Revision History

Power on for Start-up

  1. Verify VIN and +5 V DC bias power supplies are OFF/disabled and no voltage is applied to the UUT
  2. Move EN shorting jumper to the J3:2-3 EN ON position
  3. Turn on the VIN DC power supply. Verify 24 V is present at TP8-to-TP9
  4. Verify the loads on VDD and VEE are disabled
  5. Turn on the +5 V DC bias power supply. EVM is now enabled with VDD and VEE in regulation under no load conditions.
  6. Verify 20 V is present on VDD and 5 V is present on VEE
  7. Enable the 80-mA load on VDD, enable the 10-mA load on VEE
  8. The UCC14240-Q1 is now regulating VDD and VEE and processing ~1.6 W of isolated output power
  9. Vary VIN between 21 V<VIN<27 V, vary IVDD between 0 mA<IVDD<80 mA, vary IVEE between 0 mA<IVEE<10 mA.
  10. Insert oscilloscope probes into TP10, TP6 and TP4 for measuring VIN, VDD and VEE start-up, steady state and AC ripple voltage