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

5.12 Thermal Performance of TPS25985EVM

Use the following instructions to evaluate the thermal performance of TPS25985EVM:

  1. Configure the Jumper J6 position to desired reference voltage (VIREF) for overcurrent protection and active current sharing as mentioned in Table 4-3. 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 suitable position to set required circuit breaker threshold (IOCP) as per Table 4-3. Both the "1-2" and "3-4" positions of the jumper J4 are selected in this experiment, which makes IOCP as 170 A (typical) with VIREF as 1 V (typical).
  3. Set the input supply voltage VIN to 12 V and current limit of 110 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 100 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 (TP14) pin using a digital multimeter. Voltage at the TEMP (VTEMP) pin reports the maximum die temperature between two (2) TPS25985 eFuses, which can be obtained using Equation 1.
    Equation 1. TJ°C=25+VTEMPmV-677.62.72 mV/°C

Figure 5-19 shows the thermal performance of TPS25985EVM with two (2) TPS25985 eFuses in parallel.

Figure 5-19 Thermal Performance of TPS25985EVM (VIN = 12 V, IOUT = 100 A, TA = 25 ºC, and no external air flow)