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Class d high frequency gate driver

Florencia Grosso
Prodigy 10 points
Other Parts Discussed in Thread: UCC27201, TAS5631B

Hello! I'm designing a class d sigma delta amplifier and I'd like to know which gate driver (half bridge) is more suitable for operating at 500kHz approx. I found that UCC27201 works fine at 1MHz. Can you suggest me any recommendations? Thank you!

  • 0
    TI__Guru**** 189399 points

    Hi, Florencia,

    Welcome to e2e, and thanks for your interest in our products!

    Unfortunately, we don't have any experience with this type of application.

    Perhaps someone in the community can chime in...

    Alternately, you can post in the forum that includes the UCC27201 to see if they have any other recommendations for you.

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 225 points

    The UCC27201 would appear to be ok for a design using a single voltage rail, although it doesn't have the extra functions that are useful for class-D amplifiers, such as an adjustable dead time.  You would have to ensure enough dead time to prevent shoot through of your power MOSFET, by adding asymmetrical delays to each of the two inputs.

    You might be better off looking at a couple of chips from International Rectifier, who have made various gate drivers for class-D amp applications.  Have a look at the IRS20124 for single-rail designs, or the IRS20957 for designs with symmetrical +/- power rails,

  • 0 in reply to Chris Morriss
    Prodigy 225 points

    Alternatively, you might find you could use the TAS5631B from TI, which is a power chip incorporating the MOSFET gate drivers and the output MOSFETs, but allows the use of a separate modulator stage.

    If you consider this chip, you need to be aware that it has certain control and monitoring pins that need some external circuitry to keep the chip working!  I think the data sheet has the information.

    I guess you are looking at designing a self-oscillating amplifier. In these the NFB is normally taken from the output of the power switching stage and routed to the analog stage preceding the modulator.  This analog stage must have the frequency compensation components to ensure that everything works as planned.  You need a good knowledge of class-D amplifier design to get it all to work properly! (And I'm not sure if the 'PURE-PATH' NFB that TI use in the chip might cause problems.

    I suggest you study first the various application notes from International Rectifier on their IRAUDAMP reference designs first, even if you intend to try a TI solution.