SLUUCE8A February 2021 – October 2021 UCC25800-Q1
- Trademarks
- 1 Description
- 2 Electrical Performance Specifications
- 3 Schematic Diagram
- 4 Description - How to Use
- 5 Test Setup
-
6 Performance Data and Typical Characteristic Curves
- 6.1 Efficiency Result of the LLC Board with External DC Input Voltage
- 6.2 Efficiency Result of the LLC Board with Pre-regulator on Board
- 6.3 Efficiency Typical Results
- 6.4 Output Characteristics
- 6.5 Output Voltage Turn-on at Start Up
- 6.6 Output Ripple Voltage
- 6.7 Frequency Synchronized to External Signal
- 6.8 DIS-pin Enable and Dis-Enable
- 6.9 Load Transient Response
- 6.10 Switch-node Voltage and Current
- 6.11 Over-Current Limit and FLT-pin
- 6.12 CISPR-25 Class-5 Conducted EMI Test Result - Pass
- 6.13 Thermal Images at Full Load
- 7 Transformer Details
- 8 EVM Assembly and Layout
- 9 List of Materials
- 10Revision History
7 Transformer Details
Wurth Electronik transformer part number 750319177 is used on this design.
Figure 7-1 Transformer Schematic DiagramTable 7-1 Transformer Specifications at 20°C
| PARAMETER | VALUE | PINS/LEADS | TEST CONDITIONS |
|---|---|---|---|
| Inductance (μH) | Min: 16.5 | 1 – 3 | Open all other pins, 100kHz, 0.1V |
| Leakage Inductance (μH) | Typ: 0.55, Max: 0.75 | 1 – 3 | Short 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 – 6 | 1 s |
| Turns-ratios | 1 :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 | |||