SLVUCB8A May   2022  – September 2022 TPS25985

 

  1.   TPS25985 evaluation module for eFuse User's Guide
  2.   Trademarks
  3. 1Introduction
    1. 1.1 EVM Features
    2. 1.2 EVM Applications
  4. 2Description
  5. 3Schematic
  6. 4General Configurations
    1. 4.1 Physical Access
    2. 4.2 Test Equipment and Setup
      1. 4.2.1 Power supplies
      2. 4.2.2 Meters
      3. 4.2.3 Oscilloscope
      4. 4.2.4 Loads
  7. 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 PROCHOT# Implementation Using General-Purpose Comparator
    11. 5.11 Quick Output Discharge (QOD)
    12. 5.12 Thermal Performance of TPS25985EVM
  8. 6EVAL Board Assembly Drawings and Layout Guidelines
    1. 6.1 PCB Drawings
  9. 7Bill Of Materials (BOM)
  10. 8Revision History

5.7 Overcurrent Event

Use the following instructions to perform the overcurrent test on TPS25985 eFuse:

  1. Configure the Jumper J3 to an appropriate position to obtain required overcurrent blanking period (tTIMER) as per Table 4-3.

  2. Configure the Jumper J6 position to desired reference voltage for overcurrent protection and active current sharing as mentioned in Table 4-3.

  3. Configure the Jumper J4 in a suitable position to set required circuit breaker threshold (IOCP) as per Table 4-3.
  4. Set the input supply voltage VIN to 12-V and current limit of 200-A.

  5. Connect the power supply between VIN (Connector T1) & PGND (Connector T3) and enable the power supply.

  6. Now apply an overload in the range of IOCP < ILOAD < 2 × IOCP between VOUT (Connector T2) and PGND (Connector T3) for a time duration more than tTIMER decided by using jumper J3.
  7. Observe the waveforms using an oscilloscope.

Figure 5-11 and Figure 5-12 show the circuit breaker response of TPS25985 eFuse on TPS25985EVM eFuse Evaluation Board with two (2) devices in parallel.

Figure 5-11 Overcurrent Performance of TPS25985 eFuse (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 5-12 Overcurrent Performance of TPS25985 eFuse (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)