SLUUCI9A January   2022  – December 2022 UCC28781

 

  1.   Abstract
  2.   Trademarks
  3. 1 Introduction
  4. 2 General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
  5. 3 Description of EVM
  6. 4 Electrical Performance Specifications of EVM
  7. 5 Schematic Diagram of EVM
  8. 6 Operating the EVM from a DC or an AC Source
    1. 6.1 Typical Applications
    2. 6.2 Using the EVM with a DC Voltage Source
    3. 6.3 Using the EVM with an AC Voltage Source
  9. 7 Test Set-ups
    1. 7.1 Test Set-up Requirements
      1. 7.1.1 Test Set-up Requirements for DC Input
      2. 7.1.2 Test Set-up Requirements for AC Input
    2. 7.2 Test Set-up Diagrams
    3. 7.3 Terminals and Test Points
  10. 8 Performance Data and Typical Characteristic Curves
    1. 8.1 Table of Efficiency Measurements with DC Input
    2. 8.2 Table of Efficiency Measurements with AC Input
    3. 8.3 Efficiency Graphs with DC Input Voltage (Typical Results)
    4. 8.4 Switching Frequencies in Various Operating Modes
    5. 8.5 Key Switching Waveforms and Operating Mode Load Current
    6. 8.6 Thermal Images at Full Load (15 V, 4.0 A) with DC and AC Inputs
  11. 9 Transformer Details
  12. 10EVM Assembly and Layout
  13. 11List of Materials
  14. 12Revision History

9 Transformer Details

The transformer (part number RLTI-1431) used on this design is wound on an RM8 core set. It is custom-designed for this EVM by Renco Electronics, Inc.

Figure 9-1 Transformer Schematic Diagram
Table 9-1 Transformer Specifications at 25°C
PARAMETER VALUE PINS/LEADS TEST CONDITIONS
Magnetizing Inductance (µH) 160, ± 5% 2 – 1 Open all other pins, 150 kHz, 0.1 V
Leakage Inductance (µH) 3.5 Max. 2 – 1 Short A - B, 150 kHz, 0.1 V
D.C. Resistance (Ω) 0.24, ±15% 2 – 1
D.C. Resistance (Ω) 0.007 Max. A – B
D.C. Resistance (Ω) 0.36, ±15% 6 – 7
D.C. Resistance (Ω) 3.5, ±15% 7 – 5
Dielectric (VAC, 60Hz) 3000 1,6 – A 1 s, 1 mA Max.
Turns-Ratios 1 : 0.151 : 0.151 (2-1):(A-B):(6-7) 1.0 V @ 10 kHz to 2 - 1