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UCC5350-Q1: UCC5350MC

Jiawei Hu1
Expert 5805 points
Part Number: UCC5350-Q1
Other Parts Discussed in Thread: UCC5350,

Tool/software:

Hi team,

When we use UCC5350MC to drive two parallel IGBTs, how to connect clamp pin of UCC5350? Can we connect clamp to G of  two IGBTs? Thanks!

BR

JIawei

  • 0
    TI__Mastermind 23226 points

    Hi Jlawei,

    Due to their slower switching dV/dt, IGBTs do not have as bad of Miller injection problem compared to Si Mosfets.

    It is probably best to connect CLAMP to OUT. If you connect CLAMP to G1 and G2, the gates will be shorted together, and it might lead to greater imbalance in current sharing between the IGBTs, if there is a process variation related Vth mismatch.

    If you do see a Miller spike with this circuit, then it is probably better to attache CLAMP to G1 and G2, since current mismatch is a less significant problem than Miller injection spikes.

    I am going to run some tests to further investigate the best solution to this common question, and I will get back to you with the eventual results.

    Best regards,

    Sean

  • 0 in reply to Sean Cashin
    TI__Expert 5805 points

    Hi Sean,

    Thanks for your reply. Looking forward to your test results.

    For UCC5350-Q1, which one OPN is better for this application scenario? UCC5350MC-Q1 or UCC5350SB-Q1?

    BR

    Jiawei

  • 0 in reply to Jiawei Hu1
    TI__Mastermind 23226 points

    Hi Jiawei,

    The UCC5350M will give you the flexibility to attach CLAMP to G1 and G2 if you discover extra Miller clamping is needed. That is probably the right device.

    Best regards,

    Sean