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)

5.7 Overcurrent Event

Use the following instructions to perform the overcurrent test on TPS25984B eFuse:

  1. Configure the Jumper J6 position to desired reference voltage for overcurrent protection and active current sharing as mentioned in Table 4-3.
  2. Configure the Jumper J5 and J7 in a good position to set required current limiting threshold (IOCP) as per Table 4-3.
  3. Connect an electronic load (capable of applying load transients of up to 200A) between VOUT (Connector T2) and PGND (Connector T3) and leave the load disabled.
  4. Set the input supply voltage VIN to 12V and current limit of 200A.
  5. Connect the power supply between VIN (Connector T1) and PGND (Connector T3) and enable the power supply.
  6. Now apply an overload using the electronic load in the range of IOCP < ILOAD < 2 × IOCP for a time duration more than 250µs (fixed blanking timer duration).
  7. Observe the waveforms using an oscilloscope.

Figure 5-12 shows the circuit breaker response of TPS25984B eFuse on TPS25984BEVM eFuse evaluation board with two (2) devices in parallel.

TPS25984BEVM Overcurrent Performance of TPS25984B eFuse-1
VIN = 12V, COUT = 470μF, RILIM1 = 1.78kΩ, RILIM2 = 1.78kΩ, RIREF = 50kΩ, IOUT ramped from 100A to 150A for 20ms
Figure 5-12 Overcurrent Performance of TPS25984B eFuse-1