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PMP8740: Can we use Single Isolated Gate Driver instead of one Gate Driver and one Pulse Transformer

Chethan S
Prodigy 60 points
Part Number: PMP8740
Other Parts Discussed in Thread: UCC27714, SN6501, UCC20225

Greeting of the day!

In PMP8740 Application Note, we have been using a configuration that includes both a Gate Driver(UCC27524DGN) and a Pulse Transformer(56PR3362) to drive the gates of power semiconductors. However, we are exploring the possibility of simplifying our design and reducing component count.

Specifically, we are interested in understanding whether it is feasible to replace the combination of a Gate Driver and a Pulse Transformer with a Single Isolated Gate Driver. We believe that such a modification could potentially streamline our circuitry and provide cost benefits.

Before proceeding, we would appreciate any insights or recommendations you may have regarding the use of a Single Isolated Gate Driver(UCC20225NPLR) in comparison to the conventional setup with a Gate Driver and Pulse Transformer. Are there any critical considerations, performance implications, or compatibility issues that we should be aware of?

Additionally, if there are specific Single Isolated Gate Driver models that you would recommend for our application, please provide the relevant information, including datasheets and specifications.

Your expertise in this matter is highly valued, and we look forward to your guidance to ensure that any changes we make align with best practices and industry standards.

Thanks and Regards

Chethan S

  • 0
    TI__Expert 6005 points

    Hello Chethan,

    It is feasible to replace the combination of gate driver + pulse transformer with the UCC20225. A phase shift full bridge is suitable for such modification because most of the time all primary side MOSFETS are switching at 50% duty cycle. Therefore the bootstrap capacitor connected to the high-side isolated driver of UCC20225 is always supplied. Only in heavy burst mode, you may want to provide enough capacitance to avoid turning this high side driver off. If you have a minimum load, then the burst mode will be always sufficient to recharge this bootstrap capacitor. If, instead, the converter may have long switching pause between bursts, then I suggest to replace the bootstrap diode with a simple isolated power supply, for example with a SN6501. Regarding other possibilities for removing the pulse transformer, I suggest to consider the solution with UCC27714 + digital isolator ISO7240; such solution is visible in the UCC27714 EVM, see link:

    https://www.ti.com/lit/pdf/sluub02

    Please let me know if that helps.

    Best regards,

    Roberto