SLVUDB7 June   2025 TPS7H5020-SEP

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  6. 2Hardware
    1. 2.1 Setup
      1. 2.1.1 Primary Side Regulation
    2. 2.2 Connector Descriptions
    3. 2.3 Best Practices
  7. 3Implementation Results
    1. 3.1 Default Configuration Results
    2. 3.2 Soft Startup
    3. 3.3 Voltage Ripple on VOUT
    4. 3.4 Load Step
    5. 3.5 Frequency Response
    6. 3.6 Efficiency
  8. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layouts
    3. 4.3 Bill of Materials (BOM)
  9. 5Compliance Information
  10. 6Additional Information
    1. 6.1 Trademarks
  11. 7Related Documentation

2.1.1 Primary Side Regulation

The TPS7H5020FLYEVM offers two feedback modes: a non-isolated direct feedback mode and Primary Side Regulation (PSR). By default, the direct feedback mode is implemented. To change feedback modes from direct to PSR, the 0Ω resistor on R14 must be moved to the empty footprint at R16.

The transformer used on the TPS7H5020FLYEVM incorporates an auxiliary winding on the primary side to support PSR. This auxiliary winding has the same 2:1 ratio with the primary as the secondary winding, allowing the same feedback divider to regulate both direct and PSR feedback.

To isolate the output of the EVM from the input, PSR must be used. Additionally, the 0Ω jumpers connecting the two GND planes together, R21 and R22, must be removed to achieve isolation.

When using PSR, a minimum load of 50mA and a maximum load of 1A are recommended to keep the output regulated around the 5V. Outside of this current range, the output voltage begins to deviate significantly from the setpoint.