SLVAFR8 January   2025 TPS1685 , TPS1689 , TPS25984 , TPS25984B , TPS25985 , TPS25990

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Over-Current Response of Conventional eFuse Devices
  6. 3Challenges with Current Limit Functionality
  7. 4Proposed Design Using TI's High-Current eFuses
    1. 4.1 Steady-State Over-Current Protection in TPS25984, TPS25985, TPS25990, and TPS1685 eFuses
    2. 4.2 Design Guideline
  8. 5Thermal Performance with Continual Transient Load Current
  9. 6System Level Advantages with TI's eFuse Design
    1. 6.1 Lower Number of eFuses to be Connected in Parallel
    2. 6.2 Reduced PSU Size
  10. 7Summary
  11. 8References

6.2 Reduced PSU Size

In the customer use case mentioned in Section 6.1, the input PSU's minimum steady-state current rating needs to be around 240A using TI's eFuse design. A 3.2kW M-CRPS is selected. Dimensions of this PSU are 185mm (L) x 73.5mm (W) x 39mm (H).

The input PSU's minimum steady-state current rating needs to be around 440A using conventional eFuses. A 3.2kW M-CRPS is not enough to support this current. Another 2.2kW CRPS (DPS-2200AB-2) needs to be in parallel with a 3.2kW M-CRPS. Dimensions of the DPS-2200AB-2 PSU are 265mm (L) x 73.5mm (W) x 40mm (H). The total PSU size can be 265mm (L) x 147mm (73.5 x 2) (W) x 40mm (H) using the conventional eFuse design, which is approximately 2.9 times larger than the design using TI's eFuse devices.