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UCC5350: CLAMP pin connection at driving parallel MOSFET

tateo yamashiro
Guru 10890 points
Part Number: UCC5350


Hi,

We got a question from the customer about UCC5350MC.
Could you help us?

[Question]
They are considering using UCC5350MC to drive a parallel MOSFET. They want to make sure how to CLAMP pin connection. Is there recommended layout guidlines?

Best Regards,
tateo

  • 0
    TI__Intellectual 2805 points

    Hello Tateo,

    I am the applications engineer responsible for the UCC5350MC and will help you with your question.

    The CLAMP pin on the UCC5350MC should be connected as close to the gate as possible.

    During the off state, the clamp pin needs to sense the voltage at the gate and compare it to ~2V. If the gate voltage rises above ~2V it will create a low impedance path to ground to discharge the gate.

    regards,
    Mateo

  • 0 in reply to Mateo Begue
    Guru 10890 points

    Hi, Thank you for your support. They are concerned an unblanced gate sink current is occurred, when a parallel MOSFET is connected. To prevent this phenomenon, are there any solutions?

    Best Regards,
    tateo

  • 0 in reply to tateo yamashiro
    TI__Intellectual 2805 points

    Hello Tateo,

    In order to prevent unbalanced sink current the MOSFETs should be identical and both traces connecting the clamp pin to the gates of the MOSFETs should be equal in trace length and width.

    regards,
    Mateo