SLUUCE8A February   2021  – October 2021 UCC25800-Q1

 

  1.   Trademarks
  2. 1 Description
  3. 2 Electrical Performance Specifications
  4. 3 Schematic Diagram
  5. 4 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. 5 Test Setup
    1. 5.1 Test Setup Requirements
    2. 5.2 Test Setup Diagram
    3. 5.3 Test Points and Input / Output Terminals
  7. 6 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. 7 Transformer Details
  9. 8 EVM Assembly and Layout
  10. 9 List of Materials
  11. 10Revision History

7 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