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

7.1.2 Test Set-up Requirements for AC Input

Safety: This evaluation module is not encapsulated and there are accessible voltages that are greater than 50 VDC.

Input Isolation Transformer: A suitably-rated 1:1 isolation transformer shall be used on the AC input to this EVM and be constructed in a manner in which the primary windings are separated from the secondary windings by reinforced insulation, double insulation, or a screen connected to the protective conductor terminal.

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WARNING:

  • If you are not trained in the proper safety of handling and testing power electronics please do not test this evaluation module.
  • While the EVM is energized, never touch the EVM or its electrical circuits, as these circuits can be at high voltages capable of causing electrical shock hazard.
  • Caution Hot Surface. Contact can cause burns. Do not touch!
  • Read this user's guide thoroughly before making test.

Voltage Source: Isolated AC source or variable AC transformer capable of 264 VRMS and capable of handling 100-W power level. Warning:Do not apply DC voltage to this board when the X-capacitor discharge function is enabled, or damage may happen. If a DC voltage source must be used at AC Input J1, the XCD Jumper at J5 must be set to "XCD DISABLED" position before DC power is applied. Remove all power from the EVM before changing position of the XCD Jumper.

Output Meters: Digital voltage meter, digital current meter

Input Power Analyzer: Capable of measuring 10 mW to 100 W of input power and capable of handling 264-VRMS input voltage. Some power analyzers may require a precision shunt resistor for measuring input current to measure input power of 5 W or less. Please read the power analyzer’s user manual for proper measurement setups for full power and for stand-by power. For efficiency assessments, remember to subtract the power losses of R33, R34, and R35 (across C2) from the input power measurements.

Oscilloscope:

  • 4-Channel, 500 MHz bandwidth.
  • Probes capable of handling 600 V.

Output Load: Resistive or electronic load capable of handling 100 W at 15 V.

Recommended Wire Gauge: Insulated 18AWG.

Set up the test configuration for AC input as shown in Figure 7-2.

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WARNING:

Caution: Do not leave EVM powered when unattended.

!! Do not apply DC voltage source to the AC input of this board or damage can happen! (See above set-up of Voltage Source)