SLVUCW7 September   2024 TPS1685

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 General Configurations
      1. 2.1.1 Physical Access
      2. 2.1.2 Test Equipment and Setup
        1. 2.1.2.1 Power Supplies
        2. 2.1.2.2 Meters
        3. 2.1.2.3 Oscilloscope
        4. 2.1.2.4 Loads
  8. 3Implementation Results
    1. 3.1 Test Setup and Procedures
      1. 3.1.1  Hot Plug
      2. 3.1.2  Start-up with Enable
      3. 3.1.3  Power Up Into Short
      4. 3.1.4  Undervoltage Lockout
      5. 3.1.5  Overvoltage Lockout
      6. 3.1.6  Transient Overload Performance
      7. 3.1.7  Overcurrent Event
      8. 3.1.8  Output Hot Short
      9. 3.1.9  Quick Output Discharge (QOD)
      10. 3.1.10 Thermal Performance of TPS1685EVM
  9. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Drawings
    3. 4.3 Bill of Materials (BOM)
  10. 5Additional Information
    1. 5.1 Trademarks

3.1.10 Thermal Performance of TPS1685EVM

Use the following instructions to evaluate the thermal performance of TPS1685EVM:

  1. Configure the Jumper J6 position to desired reference voltage (VIREF) for overcurrent protection and active current sharing as mentioned in 7. The 3-4 position of the jumper J6 is selected in this experiment, which makes VIREF as 1V (typical).
  2. Configure the jumper J3 in a good position to set required circuit breaker threshold (IOCP) as per 7. The 3-4 position of the jumper J3 is selected in this experiment, which makes IOCP as 44A (typical) with VIREF as 1V (typical).
  3. Set the input supply voltage VIN to 54V and current limit of 50A.
  4. Connect the power supply between VIN (connector T1) and PGND (connector T3) and enable the power supply.
  5. Now apply a load of 40A (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 (TP8) pin using a digital multi-meter. Voltage at the TEMP (VTEMP) pin reports the maximum die temperature between two TPS1685 eFuses, which can be obtained using Equation 1.
Equation 1. TJ°C=25+VTEMPmV-6812.73 mV/°C

The thermal performance of TPS1685EVM with two TPS1685 eFuses in parallel is shown in Figure 3-13.

TPS1685EVM Thermal Performance of TPS1685EVM(VIN = 54V, IOUT = 40A, TA = 30ºC, and no external air flow)Figure 3-13 Thermal Performance of TPS1685EVM(VIN = 54V, IOUT = 40A, TA = 30ºC, and no external air flow)