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LMG3622: Transient thermal impedance and Safe operating area

Kaji@PAN
Mastermind 7795 points
Part Number: LMG3622
Other Parts Discussed in Thread: LMG3616, UCC28782

Tool/software:

Hello,

I am an FAE at a distributor that handles TI products.
I received an inquiry from my customer about LMG3622 and LMG3616.
The datasheets for these two products do not include diagrams for Transient thermal impedance and Safe operating area.
Is there any documentation available?
Also, the safe operating area diagram is usually shown at 25°C, but can you please tell me how to make it compatible with other temperatures?

Best regards,

  • 0
    TI__Expert 4510 points

    Hello Michinari,

    Unfortunately we do not have transient thermal data or SOA curves at the moment.
    The package thermal resistance is listed, and we are developing PLECS models for our devices which will help with thermal modeling.

    With some data, we can assume a linear relationship to temperature, however an SOA curve will not follow a linear relationship. Typically the SOA curve will exponentially shrink with higher temperature, but is highly dependent on an individual device's breakdown mechanisms.

    Thanks,
    Zach S

  • 0 in reply to Zachary Soviero
    Mastermind 7795 points

    Thank you for your reply.
    We are currently considering the UCC28782, and will use the LMG3622 for the main switch and the LMG3616 for the active clamp.
    At this point, we do not specifically need SOA information, but we assume that this information will definitely be necessary as we proceed with the design.
    If we do not have the SOA information at that time, how should we make our decision?
    Best regards,

  • +1 in reply to Kaji@PAN
    TI__Expert 4865 points

    Customer can refer to Section 7.3.1 in the datasheet for voltage switching capability of the device, and the continuous ID rating in Table 5.3

    Thanks,

    John