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UCC21750: Half-bridge design solution using negative turn-off with dual isolated power supplies

David Nyarko
Expert 1575 points
Part Number: UCC21750
Other Parts Discussed in Thread: UCC21732-Q1, TIDA-020030

I am considering the UCC21750 for a high power 3 phase inverter design using 3 half-bridge IGBTS

Is there an application note/schematic for:

1) A design using 2 independent  negative turn-off solutions

(one for the high-side and the other for the low-side).

2) Same design as 1) above but including external booster transistors (i.e if the needed gate drive was greater than the

UCC21750 alone can provide)

The data sheet as well as the SLUUBX2A documents focus on driving a single switch (SiC/IGBT).

Thanks

David Nyarko

  • 0
    TI__Expert 4875 points

    Hi David,

    Thanks for your question. We have a lot of great reference designs for what you are asking about.

    1) Please check out the TIDA-020030. This reference design uses the UCC21732-Q1 to drive a half-bridge, but the bias supply design for UCC21750 would be the same. The schematic, design files and reference guide are located at this link. If you're interested in other bias supply options, we have this reference guide discussing three different options, as well.

    2) We have a couple of reference designs showing the implementation of BJT buffers with smart gate drivers. Neither are using the UCC217xx device, but the design guidelines still apply. Based on the required drive strength, you may use different BJTs than are used in these references. Please see TIDA-00794 and this reference for driving Parallel IGBTs.

    I hope these are helpful and please reach out if you have any other questions!

    Regards,

    Audrey

  • 0 in reply to Audrey Dearien7
    Expert 1575 points

    Thanks for the great information. 

    David