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

5.11 Quick Output Discharge (QOD)

Use the following instructions to observe the Quick Output Discharge (QOD) functionality:

  1. Set the input supply voltage VIN to-12 V and current limit to 10-A. Turn ON the power supply.
  2. Use the switch SW1 to connect the EN/UVLO pin to ground to do power cycling.
  3. Use the switch SW2 to enable the QOD by making the voltage at EN/UVLO pin in the range of 0.8-V to 1.1-V with the input voltage of 9.8-V to 13.5-V.
  4. Observe the waveforms of VIN (TP3), VOUT (TP4), PG(TP32), and EN(TP33) using an oscilloscope.

In Figure 5-17, the turn-off performance of the TPS25985 eFuse with QOD enabled is shown, whereas Figure 5-18 illustrates the turn-off performance with QOD disabled on the TPS25985EVM eFuse Evaluation Board.

Figure 5-17 QOD Enabled on TPS25985 eFuse (VIN = 12 V, COUT = 470 µF, and EN Pulled Low to 0.8 V)
Figure 5-18 QOD Disabled on TPS25985 eFuse (VIN = 12 V, COUT = 470 µF, and EN Pulled Low to 0 V)