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WEBENCH® Tools/TPS92510: Why WEBENCH refulsed TPS92510?

John11513
Expert 5360 points
Part Number: TPS92510
Other Parts Discussed in Thread: TPS92513

Tool/software: WEBENCH® Design Tools

Hi,

My customer want to design a LED driver with TPS92510 (28V to 42V input, 16V/80mA output), however, it seems our design tool WEBENCH refused TPS92510. The reason is "Design is operated in discontinuous mode". I want to know if it means TPS92510 cannot be used in this condition? What will happen if the part is unsed in this design?

Thank you,

John

  • 0
    TI__Mastermind 25500 points

    Hello John,

    I am not sure exactly how webench was set up for this device since I wasn't involved. But they could have put some minimum limit due to the recommended minimum peak-to-peak inductor current ripple specified in the recommended operating conditions. I also have not used this device much myself. But I have used the TPS92513 which is based off the TPS92510 and shares control circuitry. It has no problem running at low currents and in DCM so the 510 should not either.

    Regards,

    Clint

  • 0 in reply to Clinton Jensen
    TI__Expert 5360 points

    Clint,

    Thank you for reply. This is a good news. Again, WEBENCH refused 92513 due to "This design is not stable due to phase margin ... ". I am not sure if there is any potential risk if the design is not stable?

    Regards,

    John

  • 0 in reply to John11513
    TI__Mastermind 25500 points

    Hello John,

    Webench is not always right. I have analog dimmed the 513 down to milliamps with no stability issues. Plus both have a COMP pin so stability can be adjusted. In either case it should be fine. Worst case you can force it into DCM with a lower inductor value which turns it into a single pole system which is stable.

    Regards,

    Clint

  • 0 in reply to Clinton Jensen
    TI__Expert 5360 points

    Understand now. Thank you Clinton.