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LM5123-Q1: Single Phase Boost Limit

Youhei Miyaoka
Intellectual 1365 points
Part Number: LM5123-Q1
Other Parts Discussed in Thread: TIDA-020033, , TAS6584-Q1

Hi experts,

My customer think about LM5123-Q1 + TAS6584-Q1 solution. (TIDA-020033)

At TAS6584, they are thinking 100Wx4ch=400W. Is it possible to boost in single phase? Following is conditions in LM5123.

Fsw: 2.1MHz

Vout: (Now I am asking to customer)

Power: peak 400W

Regards,

Youhei MIYAOKA

  • +1
    TI__Guru 58225 points

    Hello Youhei,

    In general it depends on the time for the duration of the peak power and the effectivity of the cooling available.

    At the end a peak power of 500W is possible, but at a switching frequency of 2.1MHz, the power dissipation in the switches might be significant. In addition, as the drivers are inside the LM5123-Q1, the device needs to handle the power dissipation caused by the switch capacitances times the on resistance of the driver switches, so this might be significant as well. I recommend using the quickstart calculator to estimate the power dissipation in the switches: https://www.ti.com/lit/zip/slvrbj1

    So the peak power capability is heavily dependent on the power dissipation handling in the design.

    Best regards,
    Brigitte

  • 0 in reply to Brigitte
    TI__Intellectual 1365 points

    Hi Brigitte

    Thank you for your prompt reply!

    I discuss about this issue to customer using calculation tool.

    Regards,

    Youhei MIYAOKA