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TIDA-010054: GATE_DRIVER_CARD protection circuit not working

Vincent Beaulieu-Gagnon
Prodigy 140 points
Part Number: TIDA-010054
Other Parts Discussed in Thread: ISO7721

Hi,

1) there was a mistake in the reference file, so i bought these https://www.digikey.ca/en/products/detail/w%C3%BCrth-elektronik/750342879/8594521 with 1:3.5 ratio

instead of these, https://www.digikey.ca/en/products/detail/w%C3%BCrth-elektronik/750343725/9741983 with 1:3.9 ration. It seems the circuit is working fine ( i got -4v,and+12v) can someone confirm?

2) In there reference design, it is stated that (The short-circuit detection and two-level turn-off function on the gate driver card is not currently
supported . To avoid false alarms, unpopulate ISO7721.). But if a short-circuit happen, Q7, will start conduction and might get damaged if the system is not shutdown.

So are the protection on the main board (Dual active bright/Power board) enough? How are the Gate Driver turned off?

Thank you,

Vincent Beaulieu-Gagnon

  • +1
    TI__Expert 4400 points

    Hi Vincent,

    Yes, I can confirm that there is an error in the part number of the push pull transformer. This will be fixed in the next revision.
    The system works fine with 12V instead of 15V, but the conduction losses might be increased. I would recommend using the 1:3.9 ratio transformer.

    Yes, the DESAT protection is currently disabled since, there where some problems with false alarms. On the main boards there is over current protection implemented, in the input, output and switching nodes which offer protection. These signals trip the PWM signals and turns off the gate drivers. If additional OC or DESAT protection is required I recommend smart gate drivers of the UCC217xx family, which have included DESAT or OC protection.

    Best regards,
    Andreas