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UCC25660: MOSFET Failure Due to High Inrush Current at Startup

Conor
Guru 12050 points
Part Number: UCC25660

Tool/software:

Hi,

We are evaluating an LLC resonant converter using the UCC25660, and we have encountered a MOSFET failure due to high inrush current at startup.

We would appreciate your guidance on the following points:

  • What could be the possible causes of excessive current flowing through the MOSFET during startup?

  • Are there any recommended design practices to prevent such failures (e.g., proper soft-start configuration, gate resistance, VCC voltage clamping, snubber circuit, etc.)?

Thanks,

Conor

  • 0
    TI__Guru 50040 points

    Hi Conor,

    If you can share the schematic and design calculator this might help us better understand what is going on. One possible cause is that the OCP threshold set too high - We have a very fast cycle-by-cycle current limit which protects in 50ns. 

    Note we now have the UCC25661 which has more feature options available,