SLVUCH6A July   2023  – November 2023 TPS25984

 

  1.   1
  2.   TPS25984EVM: Evaluation Module for TPS25984 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  Provision to Apply Load Transient and Overcurrent Event Using an Onboard Switching Circuit
    9. 5.9  Output Hot Short
    10. 5.10 Quick Output Discharge (QOD)
    11. 5.11 Thermal Performance of TPS25984EVM
  9. 6EVAL Board Assembly Drawings and Layout Guidelines
    1. 6.1 PCB Drawings
  10. 7Bill of Materials (BOM)
  11. 8Revision History

5.4 Power Up Into Short

Use the following instructions to perform the power up into short test:

  1. Set the input supply voltage VIN to 12 V and current limit to 100 A. Connect the supply between VIN (Connector T1) and PGND (Connector T3) and keep the power supply OFF.
  2. Short the output of the EVM. For example, VOUT (Connector T2) to PGND (Connector T3) through a short and thick cable to make sure the short-circuited path impedance is minimum as possible.
  3. Configure the Jumper J6 position to desired reference voltage for overcurrent protection and active current sharing as mentioned in 6.
  4. Configure the jumpers J5 and J7 positions to the desired current limits during start-up as mentioned in 6.
  5. Keep the TPS25984 eFuses disabled by pushing the switch SW1.
  6. Turn ON the power supply.
  7. Enable the TPS25984 eFuse by releasing the switch SW1.

Figure 5-8 and Figure 5-9 show the test waveforms of power up into output short on the TPS25984EVM eFuse Evaluation Board with two (2) devices in parallel.

Note: During power up into short, a thermal fold-back results in the current flowing through the device being less than the calculated value of the current limit during start-up.
GUID-D6EEA25D-85C6-459C-B6ED-474CEED8AD00-low.svg
VIN = 12 V, EN stepped up from 0 V to 3 V, RILIM = 402 Ω, RILIM2 = 402 Ω, RIREF = 40.2 kΩ, CITIMER = 22 nF, and OUT shorted to PGND
Figure 5-8 Power Up Into Output Short Response of TPS25984 eFuse
GUID-20221123-SS0I-GBP3-FKQF-BKC4WHSJMDD1-low.svg
VIN = 12 V, EN stepped up from 0 V to 3 V, RILIM2 = 402 Ω, RIREF = 40.2 kΩ, RIREF = 40.2 kΩ, CITIMER = 22 nF, and OUT shorted to PGND
Figure 5-9 Power Up Into Output Short Response in TPS25984EVM: Current Sharing Between Two (2) eFuses