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

5.11 Thermal Performance of TPS25984EVM

Use the following instructions to evaluate the thermal performance of TPS25984EVM:

  1. Configure the Jumper J6 position to desired reference voltage (VIREF) for overcurrent protection and active current sharing as mentioned in 6. The "3-4" position of the jumper J6 is selected in this experiment, which makes VIREF as 1 V (typical).
  2. Configure the jumper J4 in a good position to set required circuit breaker threshold (IOCP) as per 6. The "1-2" position of the jumper J4 is selected in this experiment, which makes IOCP as 120 A (typical) with VIREF as 1 V (typical).
  3. Set the input supply voltage VIN to 12 V and current limit of 115 A.
  4. Connect the power supply between VIN (Connector T1) and PGND (Connector T3) and enable the power supply.
  5. Now apply a load of 110 A (DC) between VOUT (Connector T2) and PGND (Connector T3) for half an hour or more to reach the thermal equilibrium point.
  6. Capture the thermal image of the EVM or monitor the voltage at TEMP (TP12) pin using a digital multimeter. Voltage at the TEMP (VTEMP) pin reports the maximum die temperature between two (2) TPS25984 eFuses, which can be obtained using Equation 1.
    Equation 1. T J ° C = 25 + V T E M P m V - 677.6 2.72   m V / ° C
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VIN = 12 V, IOUT = 110 A, TA = 25°C, and no external air flow
Figure 5-20 Thermal Performance of TPS25984EVM
Figure 5-20 shows the thermal performance of TPS25984EVM with two (2) TPS25984 eFuses in parallel.