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

Transformer Details

Wurth Electronik transformer part number 750319177 is used on this design.

GUID-9C7CD825-752E-41C5-B5ED-BEC979FE8FD8-low.pngFigure 7-1 Transformer Schematic Diagram
Table 7-1 Transformer Specifications at 20°C
PARAMETERVALUEPINS/LEADSTEST CONDITIONS
Inductance (µH)Min: 16.51 – 3Open all other pins, 100kHz, 0.1V
Leakage Inductance (µH)

Typ: 0.55, Max: 0.75

1 – 3Short 6 - 8, 10kHz, 0.1V
D.C. resistance (Ω)0.045, ±20%1 – 3
D.C. resistance (Ω)0.122 ±10%8 – 6
Dielectric (VAC)

2500

1, 3 – 61 s
Turns-ratios1 :1.67, ±2%(1-3):(6-8)

Operating Temperature Range

-40 to 150 °C

Temperature-rise included

Note: Pin 2, 4, 5, and 7 are no-connection pins