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LM25149: LM25149-Q1 EVM Verify

lee Bill
Prodigy 10 points
Part Number: LM25149

Tool/software:

We modified the LM25149-Q1 EVM to 12v output voltage

Modified items: connect VCCX to GND, FB to 49.9K to VDDA

Test conditions: Input voltage 24V, output 12V, connect load machine (1A, 3A, 5A) to verify conversion efficiency

Test results: The average conversion efficiency of the three loads is about 90% (the company's internal regulations must be greater than 95%)

How can I adjust the circuit to improve efficiency?

Thank you

  • 0
    TI__Mastermind 24165 points

    Hi,

    Please see this calculator: https://www.ti.com/tool/LM5149-LM25149DESIGN-CALC that includes an efficiency calculator for your BOM. 

    In general, your switching frequency, FET characteristics, and the inductor DCR are the main components to improve efficiency. In general, a lower switching frequency will give better efficiency, but this will come at the cost of having to use a larger inductor which tend to have more DCR.\

    If you have any additional questions, please send the calculator tool filled out and I would be happy to help.

    Thank you,

    Joshua Austria