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LM3478: LM3478 3V to 40V Boost Converter

Daniel Wagner
Prodigy 60 points

Part Number: LM3478

Hello,

Is it possible to design a 3V to 40V boost converter with an output power of 6W with the LM3478.
I know it is a high duty cycle but is it possible?

Greetings
Daniel

  • 0
    TI__Genius 10385 points

    Hi Daniel,

    Thank you for using E2E forums, regarding your query according to the WEBENCH power designer it should or is possible but for startup maybe higher Vin is required around 4.5V. However, the duty cycle limitation might be an issue for 3V input and Vout of around 40V.

    BR,

    Haroon

  • +1 in reply to Haroon Wardak
    Prodigy 60 points

    Hello Haroon,

    why should a higher Vin be required for startup and for how long?
    From 3V Up to 35V it should work fine I guess.

    Greetings
    Daniel

  • 0 in reply to Daniel Wagner
    TI__Genius 10385 points

    Hi Daniel,

    As per the WEBENCH power designer simulation at 3V input the Vout will only go up to 30-35V and for proper startup 4.5V input is needed. You can see this using the simulation tab of WEBENCH designer tool. Let me know if you have troubles with the tool itself, it should be straight forward. 

    Hope this helps.

    BR,

    Haroon

  • +1 in reply to Haroon Wardak
    TI__Mastermind 19715 points

    Hello Daniel,

    I have not seen an update from you for the last 25 days, so I assume the questions are answered and the issue is solved.
    I close this thread now. If there is still something open, please reply and the thread will get opened again.
    If you have any other question or of the thread has been locked, please open a new one.

    Clicking the Resolved Button also helps us to maintain this forum.

    Best regards,
    Harry