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

5.4 Power Up into Short

Use the following instructions to perform the power up into short test:

  1. Set the input supply voltage VIN to 12 V and current limit to 100 A. Keep the power supply OFF.
  2. Short the output of the EVM. For example, VOUT (Connector T2) to PGND (Connector T3) through a short and thick cable to make sure the short-circuited path impedance is minimum as possible.
  3. The reference voltage for overcurrent protection and active current sharing is at 1 V by default.
  4. Configure the jumpers J4 and J5 positions to the desired current limits during start-up as mentioned in Table 4-3.
  5. Keep the eFuses disabled by pushing the switch SW1.
  6. Turn ON the power supply.
  7. Enable the eFuses by releasing the switch SW1.

Figure 5-6 shows the test waveforms of power up into output short on the TPS25990EVM with one TPS25990 eFuse and one TPS25985 eFuse in parallel. Figure 5-7 presents the current sharing between two eFuses during start-up into short.

Note: During power-up into short, a thermal fold-back results in the current flowing through the device being less than the calculated value of the current limit during start-up.
GUID-20220906-SS0I-F99L-DBM5-DTKLCGDTFV27-low.svgFigure 5-6 Power Up into Output Short Response in TPS25990EVM (VIN = 12 V, EN Stepped Up from 0 V to 3 V, RILIM(TPS25990) = 665 Ω, RILIM(TPS25985) = 499 Ω, VIREF = 1 V, and OUT Shorted to PGND)
GUID-20220906-SS0I-ZWKX-PDRS-MJBXSNRN0PQF-low.svgFigure 5-7 Power Up into Output Short Response in TPS25990EVM: Current Sharing between TPS25990 and TPS25985 eFuses (VIN = 12 V, EN Stepped Up from 0 V to 3 V, RILIM(TPS25990) = 665 Ω, RLIMI(TPS25985) = 499 Ω, VIREF = 1 V, and OUT Shorted to PGND)