SLUUD60 October   2024 UCG28826

 

  1.   1
  2.   Description
    1.     Get Started
  3.   Features
  4.   Applications
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
    5. 1.5 General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
  6. 2Hardware
    1. 2.1 Additional Images
      1. 2.1.1 Using the EVM on a Load with USB-C PD Communication
      2. 2.1.2 Using the EVM on a Load Without USB-C PD Communication
  7. 3Implementation Results
    1. 3.1 Electrical Performance Specifications
    2. 3.2 Test Setup
      1. 3.2.1 Test Setup Requirements
      2. 3.2.2 Test Setup Diagram
      3. 3.2.3 Test Points
    3. 3.3 Performance Data and Typical Characteristic Curves
      1. 3.3.1  Efficiency Result of 4-Point Average on 20VOUT
      2. 3.3.2  Efficiency Result of 4-Point Average at 15VOUT
      3. 3.3.3  Efficiency Result of 4-Point Average at 9VOUT
      4. 3.3.4  Efficiency Result of 4-Point Average at 5VOUT
      5. 3.3.5  Efficiency Typical Results
      6. 3.3.6  Output Characteristics
      7. 3.3.7  Key Switching Waveforms
      8. 3.3.8  Switching Frequency vs Load
      9. 3.3.9  Output Ripple Voltage
      10. 3.3.10 Load Transient Response
      11. 3.3.11 Line transient Response
      12. 3.3.12 Surge Test
      13. 3.3.13 Short Term Overload Operation
      14. 3.3.14 CCM operation
      15. 3.3.15 EN55022 Class B Conducted EMI Test Result
      16. 3.3.16 Thermal Images at Full Load (20 V and 3.25 A)
  8. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layouts
    3. 4.3 Transformer Details
      1. 4.3.1 RLTI-1464 (RENCO)
      2. 4.3.2 750847341Rev02 (WURTH)
      3. 4.3.3 TSD-5191 (Premier Magnetics)
      4. 4.3.4 Transformer Summary
    4. 4.4 Bill of Materials
  9. 5Appendix - Efficiency
    1. 5.1 Efficiency Result of 4-Point Average on 20VOUT
    2. 5.2 Efficiency Result of 4-Point Average on 15VOUT
    3. 5.3 Efficiency Result of 4-Point Average on 9VOUT
    4. 5.4 Efficiency Result of 4-Point Average on 5VOUT
    5. 5.5 Efficiency Typical Results
  10. 6Additional Information
    1.     Trademarks

4.3.2 750847341Rev02 (WURTH)

This 750847341Rev02 comes with a turns ratio of 7:1 and hence it is slightly less efficient than RLTI1464. The drawback of 750847341Rev02 is more leakage which slightly lowers efficiency. Interwinding capacitance is similar in performance to RLTI-1464 and also improves the thermal performance of UCG28826. The terminals 3 and 4 of the 750847341Rev02 needs to be shorted externally before these are inserted in to the EVM. There is another optimized variant from Wurth 750847341Rev03 which has a turns ratio of 6:1 with all other specifications remaining the same as the Rev02 variant. If using 750847341Rev02 variant, ensure C3 is 4.7nF capacitor like GRM21AR72H472KW10D, D3 is a slow diode like SL1K and R1 is close to 200kΩ like ERJ-P06J204V. R43 which is the turns ratio setting resistor needs to be changed to 25.5kΩ.

UCG28826EVM-093 750847341Rev02 pin configurationFigure 4-6 750847341Rev02 pin configuration
UCG28826EVM-093 750847341Rev02 schematicFigure 4-7 750847341Rev02 schematic

Table 4-2 Transformer Specifications at 25°C
PARAMETER VALUE PINS/LEADS TEST CONDITIONS
Inductance (µH) 200μH ±10% 6:1 Open all other pins, 100kHz / 0.1Vac
Leakage Inductance (µH) 6uH 6:1 tie(3+4,FLA+FLB),100kHz, 100mV,
D.C. resistance (Ω) 0.23 6:1 tie(3+4), @20ºC
D.C. resistance (Ω) 0.03 FLA:FLB @20ºC
Dielectric (VAC, 60Hz) 3000Vac 1– FLA tie(3+4), 3000VAC, 1 second

, 1mA 60Hz
Turns-ratios

7:1

 (6-1):(FLA-FLB), tie(3+4) APPLY: 1.0V @ 10kHz to (6 - 1)

Vout: (FLA-FLB) 0.142V