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Original question:

LM5176: LM5176 12V TO 5V Schematic review / check

LM5176: LM5176 Schematic Review / Check buck-boost functional

Hins Weng
Prodigy 100 points
Part Number: LM5176

Hi TI Team,

Can you help me to look at the application schematic diagram of LM5176 and give me some suggestion?

Usage: LM5176 6-38 V buck-boost 12V, the range of input source is from 6V to 38V, I want to use LM5176 to buck-boost and keep the stable output at 12V/10A.  

Objective: To maintain a stable output at 12V all the time, that is, when the input power is 6V, the output needs to be boosted to 12V, and when the input power is 38V, the output needs to be stepped down to 12V.

Thanks

LM5176 6-38V BUCK-BOOST 12V.pdf

  • 0
    TI__Guru 60765 points

    Hello Hins,

    Please find here the quickstart calculator for checking the schematic: SNVC208 Calculation tool | TI.com

    Is your source able to deliver the full load at 6V input? This means average something like 22A on the input.

    Please give me some time for the schematic review. I should be able to get back to you until mid of the week.

    Best regards,
    Brigitte

  • 0 in reply to Brigitte
    Prodigy 100 points

    Hello Brigitte,

    The range of input source is from 6V to 38V, which can't provide full load at 6V input, but there seems to be no problem at >=7V main input. Can you help us share the corrected calculation value after the schematic review? 

    Best regards

    Hins Weng

  • 0 in reply to Hins Weng
    TI__Guru 60765 points

    Hello Hins,

    I did not recalculate all external components. Please use the quickstart calculator for this. 

    In general the schematic looks good.

    If you are not using PGood, you can leave it floating.

    The output sense resistance of 2 mohm is low and allows an average output current of 25A. If you only populate one of the 4 mohm resistors, you are a lot closer to the 10A you want to achieve.

    Best regards,
    Brigitte