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LM5176: LM5176 Inquiry

Hyunkyu Noh
Prodigy 20 points
Part Number: LM5176

Tool/software:

LM5176 Inquiry The input voltage is 28V. The input voltage range is 24V ~ 32V. The output specification is 28V / 36A.

But even when the normal voltage range is 24V, 42A should be allowed.

The LM5176 IC is a controller, so doesn't it use current depending on the power component??

The LM5176 datasheet shows a maximum of 6A as an example. And the Web Bench says the maximum current is 25A.

Which one is correct?? And if it's 25A, it can't meet 36A, and there's no information about parallel configuration in the datasheet.

Can I use it for 28V 36A output?? Or can you recommend another part?

  • 0
    TI__Intellectual 2250 points

    Hi Hyunkyu,

    Thanks for reaching out via e2e. May I ask you where did you get the values you mentioned (6A and 42A, I see 25A is given on Webench)?

    Generally speaking you're correct, when using a controller the maximum current is mainly limited by the switch you use. However, be aware that the controller must still be able to drive that switch, to make sure that it completely turns on.

    Don't know if you're already aware of it, but we provide a quick start excel calculator for the device (attached here below), where you can play around with different parameters. Also, on the Power Stage Designer you can try out different configurations for your converter.

     snvc208a.zip

    Hope this answers your question.

    Kind regards,

    Federico

  • 0 in reply to Federico Galli
    Prodigy 20 points

    Hello The LM5176 datasheet has an example of up to 6A.

    And when applying LM5176 on the Web bench provided by TI, the current part shows 25A as the max. So,

    is 36A at 28V possible with LM5176?? And is there no problem with heat generation?? The ambient temperature is 63℃.

  • 0 in reply to Hyunkyu Noh
    TI__Intellectual 2250 points

    Hi Hyunkyu,

    The current (and heat generation) depends on the chosen switches, inductor and other external circuitry, as the LM5176 is a buck-boost controller.

    I will let the WEBENCH team answer why the limit for the part is 25A on the tool.

    Kind regards,

    Federico

  • 0 in reply to Federico Galli
    Prodigy 20 points

    Thank you. I would appreciate it if you could quickly tell me why there is a current limit in WEBench.

  • 0 in reply to Hyunkyu Noh
    TI__Intellectual 2340 points

    Hi Hyunkyu,

    I hope this message finds you well.

    Please be informed that the LM5176 was released quite some time ago, and we are currently unaware of the rationale behind the current being limited to 25A. To address this, we will reach out to the relevant product expert to investigate the reasons behind this limitation at the time of release and to explore the possibility of aligning it with the datasheet specifications.

    However, as we are approaching the year-end holiday season, many of our product experts are on vacation, which may result in delayed responses and potentially impact our turnaround time. We kindly request your understanding and patience as we work on this matter.

    We remain optimistic about obtaining some insights by the end of next week and will ensure to keep you informed of any progress.

    Thank you for your continued support and understanding.

    Best Regards,
    Sateesh A G

  • 0 in reply to Sateesh Goudappanavar
    TI__Expert 5810 points

    Hi Hyunkyu,

    We apologize for the delay in response.
    In regards to the issue reported with respect to LM5176 as per the suggestion from product expert we have extended the maximum output current supported by device to 40A and we have added the maximum power limit of 1KW in device LM5176.
    Above are changes are now available on ti.com.

    But however with above changes devices fails to create the design for Vout of 28V and Iout of 36A as its exceeding maximum power limit of 1KW.
    Alternatively we request you to use quick start excel calculator for the device (attached here below).

    Kindly revert back to us for any further queries.

    1884.snvc208a.zip

    Thanks and Regards,
    Umayal