SLUUD60A October   2024  – February 2025 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 (20V and 3.25A)
  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
  11. 7Revision History

4.3.3 TSD-5191 (Premier Magnetics)

This transformer comes with a turns ratio of 7:1. Although this transformer has the advantage of lowest leakage amongst all variants the major drawback of this transformer is higher interwinding capacitance which heats up the UCG28826 controller. The

Snubber components used can be the same as RLTI-1464. R43 which is the turns ratio setting resistor needs to be changed to 25.5kΩ.

UCG28826EVM-093 TSD-5191 Pin ConfigurationFigure 4-8 TSD-5191 Pin Configuration
UCG28826EVM-093 TSD-5191 SchematicFigure 4-9 TSD-5191 Schematic

Table 4-3 Transformer Specifications at 25°C
PARAMETER VALUE PINS/LEADS TEST CONDITIONS
Inductance (µH) 200μH ±5% (10,11,12) - (1,2,3) Open all other pins, 100kHz / 0.1Vac
Leakage Inductance (µH) 3μH

(10,11,12) - (1,2,3)

 Short FLA - FLB, 100kHz / 0.1Vac
Dielectric (VAC, 60Hz) 4000Vac (10,11,12):FLA

60Hz, 3mA, 1s ramp, 1s dwell
Turns-ratios

7:1

 (10,11,12)-(1,2,3): (FLA:FLB)

APPLY: 1.0V @ 10 kHz to (10,11,12)-(1,2,3) Vout: (FLA-FLB) 0.142V