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LM25148-Q1: Application issues of chips

Tonyx.wu
Expert 2595 points
Part Number: LM25148-Q1

What is the specific range of current induced resistance values? Can 3mohm be the value of Rs?Can you provide a detailed explanation of the following calculation formula?

  • 0
    TI__Mastermind 22299 points

    Hi Tonyx,

    The current sense resistor sets the peak inductor current limit.

    3mΩ can be used as current resistor, because the current sense threshold is 60mV, this will set a 60mV/3mΩ = 20A peak inductor current limit.

    You need to make sure your parts can tolerate 20A, mainly the inductor saturation current, MOSFET losses and the current sense resistor power dissipation (20A)^2*3mΩ = 1.2W.

    It is best to size your current sense resistor for the required output current.

    Hope this helps.

    -Orlando