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

5.7 Overcurrent Event

Use the following instructions to perform the overcurrent test on TPS25990 eFuse:

  1. The overcurrent blanking timer duration (tTIMER) is 2.18 ms by default. The overcurrent blanking timer duration can be programmed via PMBus using the OC_TIMER (E6h) (E6h) register if another timer duration is needed in the range of 0 ms to 25.5 ms.
  2. 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.
  3. Place jumper J6 in a good position to set required circuit breaker threshold (IOCP) as per Table 4-3.
  4. Set the input supply voltage VIN to 12 V and current limit to 200 A.
  5. Connect the power supply between VIN (Connector T1) and PGND (Connector T3) and enable the power supply.
  6. Now apply an overload in the range of IOCP < ILOAD < 2 × IOCP between VOUT (Connector T2) and PGND (Connector T3) for a time duration more than tTIMER decided by using the OC_TIMER (E6h) register through PMBus.
  7. Observe the waveforms using an oscilloscope.

Figure 5-11 shows the circuit breaker response in TPS25990EVM with one TPS25990 eFuse and one TPS25985 eFuse in parallel. Figure 5-12 presents the current sharing between two eFuses during the circuit breaker event.

GUID-20220906-SS0I-F4D7-WHZ8-MR93QH5LXPKD-low.svgFigure 5-11 Overcurrent Performance in TPS25990EVM (VIN = 12 V, tITIMER = 20 ms, COUT = 470 μF, RIMON = 1.47 ∥ 1.1 kΩ, VIREF = 1 V, IOUT Ramped from 85 A to 140 A then 85 A within 30 ms)
GUID-20220906-SS0I-VLJS-CRJH-KD3NPDRSW6ML-low.svgFigure 5-12 Overcurrent Performance in TPS25990EVM: Current Sharing between TPS25990 and TPS25985 eFuses (VIN = 12 V, tITIMER = 10 ms, COUT = 470 μF, RIMON = 1.47 ∥ 1.1 kΩ, VIREF = 1 V, IOUT Ramped from 85 A to 140 A then 85 A within 15 ms)