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UCC27222: Predictive gate driver in synchronous boost application?

Part Number: UCC27222

Hi all,

I'm looking for a half-bridge gate driver to use in a synchronous boost DC-DC design, and I'm attracted to the idea of an adaptive driver to maximize efficiency.  I found TI's predictive gate drivers (UCC27222 / UCC27223), read all I could find about them, and concluded that these seem like fantastic parts.  They are, however, described as being specifically suited for a buck application, as are all of the adaptive gate drivers I found from TI and everyone else.

I'm wondering: is there any reason I couldn't use one of these predictive parts in a synchronous boost design?  The circuit shares the same three main power parts (half-bridge switches and an inductor) arranged in the same way, just with the input and output nodes swapped.  It seems to me that the synchronous rectification principle would be the same in both converters, namely that you want to turn on the synchronous switch as soon as possible after shutting off the low-side switch without inducing shoot-through currents.

Thanks,

Josh

  • Hi Josh,

    Thank you for your interest in the UCC27222 and UCC27223 drivers. I am looking into your inquiry about using these in a boost configuration. Since these are older devices, it may take me a little bit to confirm, as the original engineers may no longer be at TI. Please give me a day or so to confirm.

    - Daniel
  • In reply to Daniel Ruiz:

    Thanks for the quick response Daniel - I look forward to hearing whatever you find out.
  • In reply to Josh Heiner:

    Josh,

    Unfortunately, these devices were designed for synchronous buck applications only. The predictive gate drive controller was designed to sense the gate and drain of a low-side SR MOSFET. As you know, for the boost converter the SR MOSFET is the high-side device.

    Thanks again for your interest in TI products and please let me know how I can help you find a different driver that fits your application's needs.

    - Daniel
  • In reply to Daniel Ruiz:

    Bummer Daniel - but that makes sense.  Thanks very much for looking into it for me.

    Does TI have any adaptive gate drivers that would work for a synchronous boost converter?

    Josh

  • In reply to Josh Heiner:

    Josh,

    Take a look at the datasheets LM5104, TPS28226, and LM27222. These drivers offer adaptive dead time. It is not the same technology as discussed above for the Predictive Gate Drive, but they may meet your needs.

    I hope this helps.

    - Daniel
  • In reply to Daniel Ruiz:

    I will check those out. Thanks Daniel!

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