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

5.2 Start-up with Enable

Use the following instructions to power up the TPS25990EVM with ENABLE:

  1. Configure the jumper J3 position to the desired slew rate mentioned in Table 4-3.
  2. Configure the jumpers J4 and J5 positions to the desired current limits during start-up as mentioned in Table 4-3.
  3. The reference voltage for overcurrent protection and active current sharing is at 1 V by default. The reference voltage is also programmed through PMBus using the VIREF (E0h) register if another reference voltage is needed in the range of 0.3 V to 1.2 V.
  4. Set the input supply voltage VIN to 12 V and current limit to 100 A.
  5. Connect a load of 0.4 Ω between VOUT (Connector T2) and PGND (Connector T3).
  6. Connect the input supply between VIN (Connector T1) and PGND (Connector T3).
  7. Turn on the power supply by keeping the device disabled using the switch SW1.
  8. Enable the eFuses by releasing the switch SW1.
  9. Observe the waveform at VOUT (TP4) and input current using an oscilloscope to measure the slew rate and rise time of the VOUT with a given input voltage of 12 V.

Figure 5-3 shows the start-up profile with ENABLE using one (1) TPS25990 eFuse and one (1) TPS25985 eFuse in parallel. Figure 5-4 presents the current sharing between two eFuses during start-up.

GUID-20220916-SS0I-94FS-F0FX-HXH5GR9CWNKX-low.svgFigure 5-3 Start-up Profile with ENABLE (VIN = 12 V, EN Stepped Up from 0 V to 3 V, COUT = 18.47 mF, RLOAD = 1.2 Ω, RILIM(TPS25990) = 523 Ω, RILIM(TPS25985) = 402 Ω, VIREF = 1 V, and CDVDT = 33 nF)
GUID-20220906-SS0I-5533-MVNJ-NKHMNQDJJ3VQ-low.svgFigure 5-4 Start-up Profile with ENABLE: Current Sharing between TPS25990 and TPS25985 eFuses (VIN = 12 V, EN Stepped Up from 0 V to 3 V, COUT = 15.47 mF, RLOAD = 0.4 Ω, RILIM(TPS25990) = 523 Ω, RILIM(TPS25985) = 402 Ω, VIREF = 1 V, and CDVDT = 33 nF)