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

3.1.7 Overcurrent Event

Use the following instructions to perform the persistent over-current test on TPS1685 eFuse:

  1. Configure the Jumper J2 to an appropriate position to obtain the required overcurrent blanking period (tTIMER) as per 7.
  2. Configure the Jumper J6 position to the desired reference voltage for overcurrent protection and active current sharing as mentioned in 7.
  3. Configure the Jumper J3 in a good position to set the required circuit breaker threshold (IOCP) as per 7.
  4. Configure the Jumper J7 in a good position to set the required scalable fast-trip threshold (ISFT) as per 7.
  5. Set the input supply voltage VIN to 12V and the current limit of 200A.
  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 andlt; ILOAD andlt; ISFT between VOUT (connector T2) and PGND (connector T3) for a time duration more than tTIMER decided by using jumper J2.
  8. Observe the waveforms using an oscilloscope.

The circuit breaker response of TPS1685 eFuse on TPS1685EVM Evaluation Board with two devices in parallel is shown in Figure 3-8.

TPS1685EVM Persistent Overload Performance of TPS1685 eFuse (VIN = 54V, CITIMER = 27nF, COUT = 1mF, RIMON = 1.1kΩ (IOCP = 50A), RIREF = 40.2kΩ (VREF = 1V), and IOUT Ramped from 40A for 10ms to 80A for 20ms) Figure 3-8 Persistent Overload Performance of TPS1685 eFuse (VIN = 54V, CITIMER = 27nF, COUT = 1mF, RIMON = 1.1kΩ (IOCP = 50A), RIREF = 40.2kΩ (VREF = 1V), and IOUT Ramped from 40A for 10ms to 80A for 20ms)