SLUUCE8A February   2021  – October 2021 UCC25800-Q1

 

  1.   Trademarks
  2. Description
  3. Electrical Performance Specifications
  4. Schematic Diagram
  5. Description - How to Use
    1. 4.1 Typical Applications
    2. 4.2 Using the EVM with on-board Pre-regulator on Board
    3. 4.3 Using the EVM with an External DC Voltage Source
  6. Test Setup
    1. 5.1 Test Setup Requirements
    2. 5.2 Test Setup Diagram
    3. 5.3 Test Points and Input / Output Terminals
  7. Performance Data and Typical Characteristic Curves
    1. 6.1  Efficiency Result of the LLC Board with External DC Input Voltage
    2. 6.2  Efficiency Result of the LLC Board with Pre-regulator on Board
    3. 6.3  Efficiency Typical Results
    4. 6.4  Output Characteristics
    5. 6.5  Output Voltage Turn-on at Start Up
    6. 6.6  Output Ripple Voltage
    7. 6.7  Frequency Synchronized to External Signal
    8. 6.8  DIS-pin Enable and Dis-Enable
    9. 6.9  Load Transient Response
    10. 6.10 Switch-node Voltage and Current
    11. 6.11 Over-Current Limit and FLT-pin
    12. 6.12 CISPR-25 Class-5 Conducted EMI Test Result - Pass
    13. 6.13 Thermal Images at Full Load
  8. Transformer Details
  9. EVM Assembly and Layout
  10. List of Materials
  11. 10Revision History

Using the EVM with an External DC Voltage Source

UCC25800EVM-037 board can be used with an external DC voltage, regulated at 15.6 V. In such a case, connect external DC voltage to J1 (+) and J2 (-). The board can be broken into two, the pre-regulator board, and the LLC board. In this case the external DC voltage can be also connected to terminal P1. The LLC board has two DC outputs, 18V and -5 V.

Note: please check and remove R23 (if it exists) between J1 and J3 when using the board with an external DC voltage source.