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LM5155: LM5155

Michael Tian
Prodigy 10 points
Part Number: LM5155

Hi everyone,

I am using LM5155 for boost Converter design. The input is 3.6V and output is 12V/0.5A. The design runs good at low temperature but the current drain from power supply keeps increasing when temperature is above 220F and kind of unstable. I am not sure which parts causes the issue. LM5155 and inductor are 125C, MOSFET and Diode are 175C. All resistors and caps are at lest 155C. Thanks a lot!

Regards,

Michael

  • 0
    TI__Genius 13105 points

    Hello Michael,

    Thanks for reaching out. Can you send scopeshots of the voltages at SS,CS,FB and Vout, both in hot and cold condition please?

    And can you send a thermal picture and a picture of the Layout as well? In what order of magnitude does the current drain increase?

    We are looking forward to hear from you.

    Kind regards,

    Moritz