SLVUCB8A May   2022  – September 2022 TPS25985

 

  1.   TPS25985 evaluation module for eFuse User's Guide
  2.   Trademarks
  3. 1Introduction
    1. 1.1 EVM Features
    2. 1.2 EVM Applications
  4. 2Description
  5. 3Schematic
  6. 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
  7. 5Test Setup and Procedures
    1. 5.1  Hot Plug
    2. 5.2  Start-up with Enable
    3. 5.3  Difference Between Current Limit and DVDT Based Start-up Mechanisms
    4. 5.4  Power-up into Short
    5. 5.5  Overvoltage Lockout
    6. 5.6  Transient Overload Performance
    7. 5.7  Overcurrent Event
    8. 5.8  Provision to Apply Load Transient and Overcurrent Event Using an Onboard Switching Circuit
    9. 5.9  Output Hot Short
    10. 5.10 PROCHOT# Implementation Using General-Purpose Comparator
    11. 5.11 Quick Output Discharge (QOD)
    12. 5.12 Thermal Performance of TPS25985EVM
  8. 6EVAL Board Assembly Drawings and Layout Guidelines
    1. 6.1 PCB Drawings
  9. 7Bill Of Materials (BOM)
  10. 8Revision History

5.5 Overvoltage Lockout

Use the following instructions to perform the overvoltage protection test:

  1. Set the input supply voltage VIN to 12 V and current limit to 100 A. Apply the supply between VIN (Connector T1) and PGND (Connector T3) and enable the power supply.
  2. Apply a load of 1.2 Ω between VOUT (Connector T2) and PGND (Connector T3).
  3. Increase the input supply VIN from 12 V to 18 V and observe the waveforms using an oscilloscope.
    Note: The input TVS diodes should be removed during the overvoltage protection test. Make sure to put them back after this experiment.

Figure 5-9 shows overvoltage lockout response of TPS25985 eFuse on TPS25985EVM eFuse Evaluation Board.

Figure 5-9 Overvoltage Lockout Response of TPS25985 eFuse (VIN Ramped Up from 12 V to 18 V, COUT = 470 μF, and RLOAD = 1.2 Ω)