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UCC27714: UCC27714: the HO stays low all the time even if there is no UVLO fault condition

Leire Benito del valle
Prodigy 10 points
Part Number: UCC27714

We are University Students who are trying to make an 3 phase inverter. The circuit that we have used is the following:

Potencia.pdf

After numerous tries the HO always stays low, even if no UVLO fault condition is present. The LO output works fine. Is there a way to solve this problem?

  • 0
    TI__Mastermind 23155 points

    Hello Leire,

    Thank you for the interest in the UCC27714 half-bridge driver. I reviewed the schematic you attached and see that the bootstrap capacitor is connected to pins 11 (HS) and 9 (which is labeled as NC). The HB capacitor should be connected to pins 11 (HS) and 13 (HB).

    Confirm if the schematic is connected as the schematic you attached and confirm the UCC27714 pin out with the UCC27714 datasheet.

    If you confirm the UCC27714 is connected properly, and you still have an issue you can post additional questions on this thread.

    Regards

    Richard Herring