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Original question:

LM5156: Request a SCH review. (LM5156+LMG2100R044+SN74LVC3G14)

LM5156: Request a SCH review

user6544449
Intellectual 795 points
Part Number: LM5156

Hello Team,

We use LM5156 to design a boost circuit, Input: 8.8V, Output: 12V/4A.

But now the inductor and MOSFET is too hot. What should we do to improve this circuit?

Thanks!

  • 0
    TI__Mastermind 30160 points

    Hello,

    Thanks for using the e2e forum.

    I do not directly see any problems within the schematic.

    Here are some check I would recommend to do:
    - Have you double checked the values inductance, compensation and sense resistance with our quickstart calculator tool? If not, you can find the tool here:
    https://www.ti.com/tool/download/SNVC224

    - Can inductor support the maximum current levels without falling into saturation?

    - How does the SW signal look like? If you see large overshoots or oscillation on the voltage signal, populating a snubber may improve the behavior

    - If all previous points do not show any problems, we need to look into the layout next.

    Best regards,
    Niklas