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)

5.4 Power Up Into Short

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

  1. Set the input supply voltage VIN to 12V and current limit to 100A. 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 as mentioned in Table 4-3.
  4. Configure the jumpers J5 and J7 positions to the desired current limits as mentioned in Table 4-3.
  5. Keep the TPS25984B eFuses disabled by pushing the switch SW1.
  6. Turn ON the power supply.
  7. Enable the TPS25984B 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 TPS25984BEVM 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.
TPS25984BEVM Power Up Into Output Short Response of TPS25984B eFuse
VIN = 12V, EN stepped up from 0V to 3V, RILIM = 1.65kΩ Ω, RILIM2 = 1.65kΩ Ω, RIREF = 50kΩ, and OUT shorted to PGND
Figure 5-8 Power Up Into Output Short Response of TPS25984B eFuse
TPS25984BEVM Power Up Into Output Short Response in TPS25984BEVM: Current Sharing Between Two (2) eFuses
VIN = 12V, EN stepped up from 0V to 3V, RILIM1 = 1.65kΩ, RILIM2 = 1.65kΩ, RIREF = 50kΩ, and OUT shorted to PGND
Figure 5-9 Power Up Into Output Short Response in TPS25984BEVM: Current Sharing Between Two (2) eFuses