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

5.10 PROCHOT# Implementation Using General-Purpose Comparator

Use the following instructions to implement PROCHOT#™ functionality using in-built general-purpose comparator:

  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 (VIREF) 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. Connect the CMPM pin (TP15) to the output of LDO, U4 (TP36) and adjust the values of R26 and R27 to make the voltage at TP36 to be 80% of VIREF.

  5. Connect CMPP (TP17) with IMON (TP27).
  6. Set the input supply voltage VIN to 12-V and connect the power supply between VIN (Connector T1) and PGND (Connector T3).
  7. Now apply a transient load in the range of 0.7 × IOCP < ILOAD < 0.95 × IOCP (as example) between VOUT (Connector T2) and PGND (Connector T3) for a specified time duration, as example 20-ms, which is less than 2 x tTIMER decided by using jumper J3.
  8. Observe the waveforms of CMPM (TP15), CMPP (TP17), CMPOUT (TP21), and load current using an oscilloscope.

Figure 5-16 shows the experimental waveforms of PROCHOT#™ implementation on the TPS25985EVM eFuse Evaluation Board.

Figure 5-16 PROCHOT#™ Implementation on TPS25985 eFuse (VIN = 12 V, RIMON = 1.1 ∥ 1.1 kΩ, RIREF = 40.2 kΩ, VCMPM = 0.8 V, and IOUT Ramped from 70 A to 95 A then 70 A within 20 ms)