SLUUCB4 June   2020 TPS25980

 

  1.   TPS25980EVM: Evaluation Module for TPS25980x efuse
    1.     Trademarks
    2. 1 Introduction
      1. 1.1 EVM Features
      2. 1.2 EVM Applications
    3. 2 Description
    4. 3 Schematic
    5. 4 General Configurations
      1. 4.1 Physical Access
      2. 4.2 Test Equipment and Set up
        1. 4.2.1 POWER SUPPLIES
        2. 4.2.2 METERS
        3. 4.2.3 OSCILLOSCOPE
        4. 4.2.4 LOADS
    6. 5 Test Setup and Procedures
      1. 5.1 Hot-Plug Test
      2. 5.2 Current Limit Test
      3. 5.3 Output Hot-Short Test
      4. 5.4 Wakeup into Short Test
      5. 5.5 Overvoltage Cut-off Test
    7. 6 EVAL Board Assembly Drawings and Layout Guidelines
      1. 6.1 PCB Drawings
    8. 7 Bill Of Materials (BoM)

5.1 Hot-Plug Test

Use the following instructions to measure the inrush current during Hot-Plug event:

  1. For checking inrush current control capability, insert additional capacitance of 1800 uF at C16 terminals. Total output capacitance = 1800 uF + 220 uF ~2 mF.
  2. Set Jumper J12 in 3-4 position to set Cdvdt at 10 nF for o/p slew rate of 0.5 V/ms.
  3. Set the input supply voltage VIN to 12 V and current limit of 5 A. Enable the power supply.
  4. Hot-plug the supply between input connectors J1 and J3.
  5. Observe the waveform at VOUT (TP2) with an oscilloscope to measure the slew rate and rise time of the eFuse with a given input voltage of 12 V.

Figure 3 shows an example of inrush current captured on the TPS25980EVM eFuse Evaluation Board.

TPS25980 Inrush-profile.pngFigure 3. TPS259804O Output Rise Profile (VIN = 12 V, CdVdT = 10 nF, COUT = 2 mF, No-load)