SLYT863 April   2025 LM5066I

 

  1.   1
  2. 1 Introduction
  3. 2 3
  4. 3 Challenges in designing a hot-swap circuit for a 48V AI server
  5. 4 Challenge No. 1: Turnoff delay during an output short-circuit
  6. 5 Challenge No. 2: False gate turn-off during a load transient
  7. 6 Challenge No. 3: Parallel resonance during controlled (slow) turn-on
  8. 7 Proposed circuit enhancements
  9. 8 Improving the turn-off response
  10. 9 Overcoming false turn-off for dynamic loads
  11. 10Damping parasitic oscillations
  12. 11Design guidelines and component selection
  13. 12Cdv/dt discharge circuit
  14. 13Conclusion
  15. 14References
  16. 15Related Websites

13 Conclusion

The emerging 48V AI servers demand significantly more power, both in peak and steady states, than traditional servers. The high-power consumption along with fast and transient dynamics impose challenges in designing front-end protection using a hot-swap controller and parallel MOSFETs. The challenges include fast turn-off of parallel MOSFETs for real faults while avoiding false turn-off for high-frequency transients from the computational load. The proposed solution in this article eliminates the limitations of legacy hot-swap controllers and enables the design of a reliable input protection solution for a 48V AI server.