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Original question:

UCC5350: The application issue of the UCC5350 drive the two IGBTs in parallel

UCC5350: UCC5350: The application issue of the UCC5350 drive the two IGBTs in parallel

user3511178
Prodigy 10 points
Part Number: UCC5350

Hi Mateo,

I meet  same question of UCC5350MC to drive two SIC FETS in parallel, I do not know how connect CLAMP pin for two GATE nets. If connect CLAMP pin to GATA directly that means Gg resistors are in parallel. Can you share the solution to the previous question.

Jack

  • 0
    TI__Expert 3355 points

    Hi Jack,

    Thank you for your question. I work on the applications team in the high power drivers group. I wasn’t involved with the previous question, but can help with this one.

    You are correct that for full effectiveness of the CLAMP pin, the gates need to be tied to the same net, and the gate resistors will effectively be paralleled. Most SiC FETs typically have some amount of internal gate resistance which will separate the two nets and damp gate-to-gate oscillations. This makes it okay to parallel the FETs and use one external gate resistor (or two for separate turn-on and turn-off strength).

    If you can't tie the gates together in the same net, you can place the CLAMP pin connection before the separate gate resistors. This will somewhat hinder the ability of the clamp pin to sink miller current, but should still help at some level.

    If you still have concerns, can you please share the part number of the SiC FETs you plan to parallel?

    If this answered your question, could you please press the green button? If not, please feel free to ask more questions.

    Thanks and best regards,

    John