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UCC21520: How to deal with the unused pin on pin 9,10 and 11

Eric Lai
Expert 4940 points
Part Number: UCC21520

Hi Expert,

The customer would like to have the leverage from their existing UCC21520 design.

But only one channel needed of new design.

Pls advice how to deal with the unused pin (pin 9,10 and 11).

Best regards,

Eric Lai

  

Field Application Engineer

Texas Instruments Taiwan Limited

O: +886-2-2175-2582

M: +886-909-262-582

E-Mail:Eric.Lai@ti.com  

  • 0
    TI__Expert 3355 points

    Hi Eric,

    Thank you for your question.

    Since the input side, CHA, and CHB are all functionally isolated from each other, you can leave unused pin 9, 10, and 11 floating, and everything should work fine.

    Another option is to tie DT (pin 6) to VCCI (pin 3,8) and parallel INA/INB, VDDA/VDDB, VSSA/VSSB and OUTA/OUTB. This will effectively double your output drive strength. Feel free to read more about this in section 5 of the app note linked below.

    http://www.ti.com/lit/an/slua778a/slua778a.pdf

    If this answered your question, could you please press the green button? If not, feel free to ask more questions.

    Thanks and best regards,

    John