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LM5116: Abnormal high temperature under load 1A

Sam Sun
Intellectual 875 points
Part Number: LM5116

Tool/software:

Severe heating at 48V-12V，Switching frequency 246k Modify R67 to 100k Ω to reduce heat generation, Change R46 to 0 Ω, reduce heat generation, load 1A, temperature still above 60℃

  • 0
    TI__Guru 58881 points

    Hello Sam

    Since you are using MOSFETs with high gate charge, you should expect higher IC temperature (~ 45°C if ambient temperature is 25°C) than typical design.  

    Also, looks like the inductor is heating up the IC, increasing the ambient temperature of the IC now. Please replace the inductor with higher efficiency inductor (MSS1583-103ME) , connect the SW terminal of the inductor directly on the board, but connect the VOUT terminal of the inductor using (~ 5cm) jumper wire and check if any improvement. 

    -EL 

  • 0 in reply to EricLee
    TI__Guru 58881 points

    I will be out of office and I will not be able to reply this E2E post anymore.
    If you are still trying to resolve the issue, please don't reply on this post, but create a NEW post to get a help from other engineers quickly.
    -EL