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Original question:

UCC21530: Pspice simulation error

UCC21530: Gate driver output coming as zero volt

Tushar Nistane
Intellectual 325 points
Part Number: UCC21530

Hello ,

I am trying to simulate a gate driver reference design of UCC21530 in LT spice. I have found the circuit on the forum page, but my output is coming zero. Please suggest. I am attaching both the files. first one is my schematic.

  • 0
    TI__Genius 12990 points

    Hi Tushar,

    Thanks for reaching out on e2e.

    Responses from the appropriate engineer may be delayed due to the holidays.

    Can you describe in more detail the output going to zero in your simulation testing?

    Does this issue happen during steady-state or start-up conditions?

    Can you send the simulation file for review?

    Thanks,

  • 0 in reply to Jeffrey Mueller
    Intellectual 325 points

    Thanks for your reply Jeff, I understand the holiday duration. I am not able to attach my simulation file, i have tried to do it before also , but as LT spice schematic is in .asc format . Attaching this file type showing me some error while posting my reply.

  • 0 in reply to Tushar Nistane
    Intellectual 325 points

    hello Jeff, my simulation is working fine now. What i did is when i off one of the input its working properly . But with both input on , even when i change DT resistor value from 1k to 1ook both output are low. can you tell me why ?

  • 0 in reply to Tushar Nistane
    TI__Expert 3355 points

    Hi Tushar,

    That sounds like the proper operation of the DT circuit. When the DT circuit is used, it will prevent both outputs from being on at the same time. This is most commonly used to prevent shoot-through in a half-bridge circuit. If you need the outputs to be on at the same time, I recommend deactivating the DT circuit by shorting DT pin 6 to VCCI pin 3/8.

    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