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UCC27201A-Q1: Maximum Frequency of Operation

Art Mecina
Genius 16575 points
Part Number: UCC27201A-Q1
Other Parts Discussed in Thread: UCC27201A

Hi Team,

Good day.

Our customer needs a part to work at 2 MHz rated at 150C without thermal shutdown. The section1 Features says that the UCC27201A-Q1 has "Greater than 1 MHz operation". They want to know if this part will reliably work at 2MHz?

Or is there any equivalent part that you can suggest that works at 2 MHz rated at 150C without thermal shutdown?

Thanks in advance!

Art

  • 0
    TI__Mastermind 21285 points

    Hello Art,

    Thank you for supporting the UCC27201A. The ability of the IC to operate at a given frequency is one concern, but the other would be the operation at 150 degC which is beyond most devices recommended operating junction temperature.

    The issue will be the operating ambient of the customer app, and the power dissipation in the driver which is based on VDD, FET Qg, and Fsw which I assume is 2MHz.

    Is a GaN targeted driver an option? The VDD and gate drive voltage of ~5V would have to be acceptable. What power devices is the customer considering?

    Regards,

  • 0 in reply to Richard Herring
    TI__Genius 16575 points

    Hello Richard,

    Apologies for the delayed response on this. 

    The customer is considering to use the UCC27201A-Q1. Can you confirm that this device can comfortably operate at 2MHz?

    Thanks!

    Art

  • 0 in reply to Art Mecina
    TI__Guru**** 189399 points
    Hi, Art, This is not a simple yes/no answer as Richard alluded to earlier. The controlling factor is power dissipation. As Richard mentioned, the parameters are: The issue will be the operating ambient of the customer app, and the power dissipation in the driver which is based on VDD, FET Qg, and Fsw which I assume is 2MHz. The datasheet has formulas to calculate the power dissipation and junction temperature due to that power dissipation. Please direct your customer to study these for their application to understand if the driver will be within its thermal limits.
  • 0 in reply to Don Dapkus
    TI__Genius 16575 points

    Thanks Don!

    However the customer mentioned that he cannot find any formula on the datasheet on how to calculate the power dissipation and junction temperature.
    I might direct the customer directly to this ticket for him to explain his use case better.

    Art

  • 0 in reply to Art Mecina
    TI__Guru**** 189399 points

    Hi, Art,

    That would be great! We will be keeping an eye out for more information from the customer.