SLVUCK4A march   2023  – july 2023 TPS25948

 

  1.   1
  2.   TPS25948EVM: Evaluation Module for TPS25948 eFuse
  3.   Trademarks
  4. 1Introduction
    1. 1.1 EVM Features
    2. 1.2 EVM Applications
  5. 2Description
  6. 3Schematic
  7. 4General Configurations
    1. 4.1 Physical Access
    2. 4.2 Test Equipment and Setup
      1. 4.2.1 Power Supplies
      2. 4.2.2 Meters
      3. 4.2.3 Oscilloscope
      4. 4.2.4 Loads
  8. 5Test Setup and Procedures
    1. 5.1 Hot-Plug Test
    2. 5.2 Overcurrent Test
    3. 5.3 Output Hot-Short Test
    4. 5.4 Wakeup into Short Test
    5. 5.5 Overvoltage Test
    6. 5.6 Priority Power Mux Test
  9. 6EVAL Board Assembly Drawings and Layout Guidelines
    1. 6.1 PCB Drawings
  10. 7Bill Of Materials (BOM)
  11. 8Revision History

5.6 Priority Power Mux Test

Use the following instructions to perform Power Mux test:

  1. Use Channel 1 and Channel 2 to test PowerMuxing capability of TPS25948.
  2. Populate R30 with 0-Ω resistor to connect VOUT1 and VOUT2.
  3. Connect J20 jumper setting to 1-2 to connect SPLYGD signal of Channel 1 to OVLO signal of Channel 2. This setting makes Channel 1 as primary and Channel 2 as secondary channels. Keep J17 open to keep reverse current blocking enabled on TPS259482.
  4. Change the UVLO threshold setting for each channel as per the voltage intended to be applied.
  5. Apply primary voltage on Channel 1 and secondary voltage on Channel 2.
  6. Test various conditions.
    1. Turn off primary channel to see output being powered from secondary channel.
    2. Turn back on primary channel to see output connected back to primary from secondary channel.

Test Waveform of PowerMux configuration when primary voltage = 12 V, secondary voltage = 20 V, and output transitioning from primary to secondary voltage as primary loses power.

GUID-20230214-SS0I-R149-Q0BM-2QFX4SV26VQS-low.svg Figure 5-7 Priority PowerMux Test on TPS25948