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UCC27712-Q1: Parallel Usage

hideyuki sakai
Mastermind 6250 points
Part Number: UCC27712-Q1
Other Parts Discussed in Thread: UCC27714

Dear, Sir.

My custommr need the high voltage robustness half-bridge gate driver, so introduced

UCC27712-Q1. The other side, they require more powerful source/sink current

capability than UCC27712-Q1 as 1.8A/2.8A.

Now, they are asking about the parallel usage of UCC27712-Q1 to enhance the

current capability. Please give your advice.

1.The input control is shared with both UCC27712-Q1, and adding the ballasting

   resistors for the balancing on each outputs.

   Is it possible this kind of usage on UCC27712-Q1?

2. Please let us know the another solution to enhance the current capability

   if you have.

Best Regards,

H. Sakai

  • 0
    TI__Mastermind 21725 points

    Hello Hydeyuki,

    Thank you for supporting the UCC27712-Q1 with your customer. I am an applications engineer supporting this device & will address your questions.

    For increasing the current capability of the UCC27712-Q1 there are a couple of options. If the automotive qualified part is not required, the UCC27714 has a higher driver current rating of 4A source and sink, If this current capability is adequate you should consider this part.

    For paralleling the UCC27712-Q1 driver, TI has not tested this configuration and there are some concerns. Since the high side driver is floating relative to the HS node there may be concerns with the difference in propagation delay from one driver device an the other. This difference in propagation delay may create issues with high voltage switch node regarding timing differences with the driver. Since we have not tested this configuration, I would not recommend paralleling the high side driver at this time.

    Another simple configuration which is low risk and likely lower cost, is to add NPN/PNP buffers to the outputs of the UCC27712-Q1 driver. This approach has been used to provide very high drive currents in some applications.

    See the diagram below. If you do not see the intended diagram let me know, as our system has had some issues in the last day or so.

    Regards,

    Richard Herring