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LM25574: DC-DC Converter

Selvan T
Prodigy 30 points
Part Number: LM25574
Other Parts Discussed in Thread: LM5137, LM5149, LM5148

Tool/software:

Hi experts,

As a fresher engineer, designing a power supply board, I need your suggestions on how to approach the design process, where to start, and how to proceed. Could you please guide me?"

Plz ignore if the above part number is not match my requirment.

Under the following conditions:

I need to design a driver with a 60V input and an output of 45V at 25A. The application is related to power electronics, and efficiency should be more than 90%. 

I need yours referencce design and experience , for learning. 

  • 0
    TI__Genius 9010 points

    Hi Selvan,

    25A is too much current for converters like LM25574 to handle. You will need to go for controllers that use external FETs. It is also better to go for a dual phase solution, as 25A can be large for a single phase. One device you can look into is LM5137, a dual phase buck controller.

    You can refer the application section of the datasheet for the design process and a reference design. There is also the quickstart calculator in the design tools section of the product page to help with component selection.

    Regards,

    Niranjan

  • 0 in reply to Niranjan Nair
    Prodigy 30 points

    Hi Sir,

    Thank you very much for your reference.

    For your information, in my high-power driver application, the input comes from an AC to DC converter (3-phase AC to 60V DC). After that, I need to take the 60V input and feed it into my driver. The driver should then convert the voltage to 43V and provide an output of 25A.

  • 0 in reply to Selvan T
    TI__Genius 9010 points

    Hi Selvan,

    The LM5137 will be able to convert 60V DC to 43V DC and provide 25A current over two channels. As it is a dual phase controller you can control two channels with one device.

    LM5148/LM5149 are other options, they are stackable single channel controllers. This means you will need two devices (one to control each channel).

    Feel free to reach out if you have any questions during implementation.

    Regards,

    Niranjan