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LM5155: LM5155 - >=250V output and >2A output

Patrick Simmons
Mastermind 26335 points
Part Number: LM5155

Hey Team,

Im looking to create a high voltage, high current supply to demo one of our current monitors. I saw this diagram in the LM5155 and I figure I can probably get around 250+ V output, but Im not sure if I can get 2A or more output.  Is this possible?  If so, do you have some TI design or app note that goes a little more in depth for the design of one of these?  I could supply the input with a 20V, 30A supply, or a 50V, 10A supply.  The 30A supply is a little less bulky and therefore I would prefer to use that one.

  • 0
    TI__Mastermind 21720 points

    Hi Patrick,

    Thanks for reaching out with your question.

    I would not  suggest using the LM5155 for 250V at 2A in this configuration. The output is is just a charge pump used to double the output voltage and is intended for small currents in the 10's of mA range.

    To meet the power requirements and step up ratio a two switch flyback might be the best choice.

    Please let me know if you have any questions. Feel free to contact me directly.

    -Garrett