SLVUD40 November   2024 TPS25984B

 

  1.   1
  2.   TPS25984BEVM: Evaluation Module for TPS25984B 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
      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
    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  Output Hot Short
    9. 5.9  Quick Output Discharge (QOD)
    10. 5.10 Thermal Performance of TPS25984BEVM
  9. 6EVAL Board Assembly Drawings and Layout Guidelines
    1. 6.1 PCB Drawings
  10. 7Bill of Materials (BOM)

5.9 Quick Output Discharge (QOD)

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

  1. Set the input supply voltage VIN to 12V and current limit to 10A. 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 0.8V–1.1V with the input voltage of 9.8V–13.5V.
  4. Observe the waveforms of VIN (TP5), VOUT (TP6), PG (TP20), and EN (TP22) using an oscilloscope.

In Figure 5-14, the turn-off performance of the TPS25984B eFuse with QOD enabled is shown, whereas Figure 5-15 illustrates the turn-off performance with QOD disabled on the TPS25984BEVM eFuse evaluation board.

TPS25984BEVM QOD Enabled on TPS25984B eFuse
VIN = 12V, COUT = 470µF, and EN Pulled Low to 0.8V
Figure 5-14 QOD Enabled on TPS25984B eFuse
TPS25984BEVM QOD Disabled on TPS25984B eFuse
VIN = 12V, COUT = 470µF, and EN Pulled Low to 0V
Figure 5-15 QOD Disabled on TPS25984B eFuse