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

5.7 Overcurrent Event

Use the following instructions to perform the overcurrent test on TPS25984 eFuse:

  1. Configure the Jumper J3 to an appropriate position to obtain required overcurrent blanking period (tTIMER) as per 6.
  2. Configure the Jumper J6 position to desired reference voltage for overcurrent protection and active current sharing as mentioned in 6.
  3. Configure the Jumper J4 in a good position to set required circuit breaker threshold (IOCP) as per 6.
  4. Connect an electronic load (capable of applying load transients of up to 200 A) between VOUT (Connector T2) and PGND (Connector T3) and leave the load disabled.
  5. Set the input supply voltage VIN to 12 V and current limit of 200 A.
  6. Connect the power supply between VIN (Connector T1) and PGND (Connector T3) and enable the power supply.
  7. Now apply an overload using the electronic load in the range of IOCP < ILOAD < 2 × IOCP for a time duration more than tTIMER decided by using jumper J3.
  8. Observe the waveforms using an oscilloscope.

Figure 5-13 and Figure 5-14 show the circuit breaker response of TPS25984 eFuse on TPS25984EVM eFuse evaluation board with two (2) devices in parallel.

GUID-5D290826-BD36-4BD4-8BE6-E1B4F78EA562-low.svg
VIN = 12 V, CITIMER = 22 nF, COUT = 470 μF, RIMON = 1.1 ∥ 1.1 kΩ, RIREF = 40.2 kΩ, IOUT ramped from 100 A to 150 A for 20 ms
Figure 5-13 Overcurrent Performance of TPS25984 eFuse-1
GUID-316D1827-8503-4326-B43F-60113988DB4F-low.svg
VIN = 12 V, CITIMER = 22 nF, COUT = 470 μF, RIMON = 1.1 ∥ 1.1 kΩ, RIREF = 40.2 kΩ, IOUT ramped from 100 A to 150 A for 20 ms
Figure 5-14 Overcurrent Performance of TPS25984 eFuse-2