SLVUD44A March   2025  – October 2025 TPS1689

 

  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 USB-to-GPIO Interface Adapter
        5. 2.1.2.5 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 Overcurrent Event
      7. 3.1.7 Output Hot Short
      8. 3.1.8 Thermal Performance of TPS1685EVM
  9. 4Using the TPS1689EVM-GUI
    1. 4.1 Access the TPS1689EVM-GUI
    2. 4.2 Introduction to the TPS1689EVM-GUI
    3. 4.3 Establishing Communication Between the EVM and GUI
    4. 4.4 Quick Info
    5. 4.5 Configuration
    6. 4.6 Telemetry
    7. 4.7 Register Map Page
  10. 5Hardware Design Files
    1. 5.1 Schematic
    2. 5.2 PCB Drawings
    3. 5.3 Bill OfmAterials (BOM)
  11.   Trademarks
  12. 6Revision History

3.1.6 Overcurrent Event

Use the following instructions to perform the persistent over-current test on TPS1689 eFuse:

  1. The overcurrent blanking timer duration (tTIMER) is 3.2ms by default. The overcurrent blanking timer duration can be programmed via PMBus using the OC_TIMER (E6h) register if another timer duration is needed in the range of 0ms to 40ms.
  2. The reference voltage for overcurrent protection and active current sharing is at 1V 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 0.3V to 1.2V.
  3. Configure the Jumper J2 in a good position to set the required circuit breaker threshold (IOCP) as per 7.
  4. Configure the Jumper J5 in a good position to set the required scalable fast-trip threshold (ISFT) as per 7.
  5. Set the input supply voltage VIN to 54V and the current limit of 100A.
  6. Connect the power supply between VIN (connector T1) and PGND (connector T3) and enable the power supply.
  7. Now apply an overload in the range of IOCP and ISFT between VOUT (connector T2) and PGND (connector T3) for a time duration more than tTIMER.
  8. Observe the waveforms using an oscilloscope.

The circuit breaker response of TPS1689 eFuse on TPS1689EVM evaluation board with two devices in parallel is shown in Figure 3-7.

TPS1689EVM Persistent Overload Performance of TPS1689 eFuseFigure 3-7 Persistent Overload Performance of TPS1689 eFuseTPS1689EVM