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WEBENCH® Tools/LM5117-Q1: Is my WEBENCH design for this device accurate in terms of efficiency?

Jim Brinkhurst1
Mastermind 44680 points
Part Number: LM5117-Q1
Other Parts Discussed in Thread: LM5145, LM5117

Tool/software: WEBENCH® Design Tools

Hi Experts

I recently completed a design based on LM5117-Q1 and have some questions about the efficiency at maximum (60V) and nominal (48V) input voltages.

Can you review this design and confirm whether the reported efficiencies are accurate?

https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=9E57D4EA1B4B00FA

Thanks!

Jim B

  • 0
    TI__Mastermind 44680 points

    Here is an updated version of the design with 48V nominal and 50V maximum that I would also like to verify.

    https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=A6862E7B0D4A954A

    Thanks!

    Jim B

  • 0 in reply to Jim Brinkhurst1
    TI__Guru 73742 points

    Hi Jim,

    Our normal recommendation for a 12V/15A solution is the LM5145 75V controller (no CS resistor required, so it a lower cost and smaller size solution). TAke a look at the LM5145 EVM, which is a 5V/20A 225kHz design with single high-side and low-side FETs. There is an Excel quickstart calculator file available in the LM5145 product folder to assist with component selection and power loss analysis.

    If you would like to retain the LM5117, check the component values with its quickstart file. For the schematic shown, the output cap is quite large so you may want to increase the soft-start cap.

    Regards,

    Tim