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

1 Introduction

The UCC28781EVM-053 is a 60-W, 15-V evaluation module (EVM) featuring the UCC28781-Q1 controller for evaluating a high-voltage DC-input zero-voltage-switching flyback (ZVSF) converter for use as a bias supply in traction inverters and other applications. The EVM is intended for evaluation purposes and is not intended to be an end product.

The EVM converts a DC input voltage range of 50 V to 500 V down to an isolated output of 15 V. Output current is rated for a maximum of 4 A for input voltages between 250 V and 500 V, and derated to a maximum of 2 A for input voltages between 50 V and 250 V. An over-power capability of up to approximately 133% of rated power is limited to a duration of 160 ms.

Alternatively, the EVM can be powered from an isolated AC source with voltages between 90-VRMS to 264-VRMS by connecting the rectified-AC section to the DC input as presented later in this user guide.