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LM25143: LM25143 design questions

Roy Lin1
Intellectual 1080 points
Part Number: LM25143

Tool/software:

Hi team,

1) customer want to use LM25143, and designed in interleave mode for 500W, 24/12Vo, 41.66A, is OK to use 1 LM25143(2 phase interleave) for this design?

our product page shows Iout max it is 100Amax.

But why our webench max is only 40A for interleave design?

Even we input with 24/12Vo 40A, our webench shows “Design cannot be created”.

2) Webench show for dual output design each channel can support 40A,

for interleave should be able to design 80A, but why webench interleave option max is still 40A?

3)  Can customer refer to 24V/12Vo, 30A webench schematic, and customer add more MOSFETs to increase to 42A 500W power level?

4) Because the our product page shows the Ioutmax is 100A.

If customer want to use do dual outputs design, 12Vin/ 5V and 3.3V. And both 5V and 3.3V channels are 50A.

Is it Ok for LM25143? if customer add more MOSFETs, can make LM25143 reach higher power level?

Have any concern?

Thanks

  • 0
    TI__Mastermind 22260 points

    Hello,

    I've numbered my answers to correspond with your questions:

    1) That is OK for this device. 

    2) Webench models are based on simulation data correlated with bench measurements. Since there is real bench data included in the model, not all specific sets of conditions are always able to be modeled. The quickstart calculator should help you and the customer design with this device if Webench does not model the specific conditions they need: https://www.ti.com/tool/download/LM5143DESIGN-CALC

    3) They should use the quickstart calculator linked above if Webench is not providing a design for their specific conditions. Some of the external components may need to change, and the calculator will help the customer make the necessary design changes. Please also refer to the applications section of the datasheet.

    4) This should be OK. Refer to the quick start calculator.

    In general, it will be up to the customer to select MOSFETs properly rated for the desired output current. The datasheet offers recommended selection criteria in the Applications Section.

    Best regards,

    Ridge