SLVUCH7A september   2022  – june 2023 TPS25990

 

  1.   1
  2.   TPS25990EVM: Evaluation Module for TPS25990 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 and Setup
      1. 4.2.1 Power supplies
      2. 4.2.2 Meters
      3. 4.2.3 Oscilloscope
      4. 4.2.4 USB-to-GPIO Interface Adapter
      5. 4.2.5 Loads
  8. 5Test Setup and Procedures
    1. 5.1  Hot Plug
    2. 5.2  Start-up with Enable
    3. 5.3  Current Limit Based Start-up Behavior
    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 TPS25990EVM
  9. 6Using the TPS25990EVM-GUI
    1. 6.1 Access the TPS25990EVM-GUI
    2. 6.2 Introduction to the TPS25990EVM-GUI
    3. 6.3 Establishing Communication Between the EVM and GUI
    4. 6.4 Quick Info
    5. 6.5 Configuration
    6. 6.6 Telemetry
    7. 6.7 Blackbox
    8. 6.8 Register Map Page
  10. 7EVAL Board Assembly Drawings and Layout Guidelines
    1. 7.1 PCB Drawings
  11. 8Bill Of Materials (BOM)
  12. 9Revision History

5.11 Thermal Performance of TPS25990EVM

Use the following instructions to evaluate the thermal performance of TPS25990EVM:

  1. The reference voltage for overcurrent protection and active current sharing is at 1 V by default. The reference voltage can also be programmed via PMBus using the VIREF (E0h) register if another reference voltage is needed in the range of 0.3 V to 1.2 V. VIREF is programmed to 1.13 V in this experiment.
  2. Place jumper J6 in a good position to set required circuit breaker threshold (IOCP) as per Table 4-3. The "3-4" position of the jumper J6 is selected in this experiment, which makes IOCP as 124 A.
  3. Set the input supply voltage VIN to 12 V and current limit of 130 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 (TP10) pin using a digital multimeter. Voltage at the TEMP (VTEMP) pin reports the maximum die temperature between TPS25990 and TPS25985, 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

Figure 5-18 shows the thermal performance of TPS25990EVM with one (1) TPS25990 eFuse and one (1) TPS25985 eFuse in parallel.

GUID-20230516-SS0I-9ZDH-H6K8-F4N74M4SJXLN-low.svg Figure 5-18 Thermal Performance in TPS25990EVM (VIN = 12 V, RIMON = 0.91 ∥ 1.1 kΩ, VIREF = 1.13 V, and IOUT = 110 A)