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LM5036: 500W Isolated DC/DC converter request

chentsu chung
Mastermind 6180 points
Part Number: LM5036
Other Parts Discussed in Thread: UC3846, LM5020, UCC28019A

Hi,

For the request:

500W isolation DC/DC conveter - plan to use Boost and DC/DC controllor for 19Vin/12Vout 40A.

1. Does LM5036 suitable for this spec? Or any suggested solution?

2. For Boost controllor, is there any suggestion?

Thank you.

  • 0
    TI__Expert 3095 points

    Hi chentsu chung,

    The most important question to answer is what is the full range of input voltage over which the output must be able to deliver full power?

    Do you have any hold-up requirement?

    Please answer these questions so that I can suggest a solution.

    Thanks

    Joe Leisten

  • 0 in reply to Joe Leisten
    Mastermind 6180 points
    Hi Joe,

    Input voltage is from 19VDC to 72VDC.
    When the input voltage is 19VDC -23.9VDC, output load reduce to 12V / 35A

    Without hold-up requirement.

    BTW, how about UC3846, looks like cheaper than LM5036.

    Thank you.
  • 0 in reply to chentsu chung
    TI__Expert 3095 points

    SNVSB14_LM5036 Draft_Aug_13_2018.pdfHi Chentsu Chung,

    The LM5036 should be fine for the isolated DC/DC requirement.

    It has some advantage over the UC3846:

    1) Enhanced peak current limit function will maintain stable operation with a half-bridge topology (pulse matching).

    2) Enhanced current limit offers relatively flat output current limit vs input voltage.

    3) Internal slope compensation.

    4) An integrated high voltage start-up regulator to get things started.

    5) An integrated Flybuck Aux. converter will provide efficient Aux power over the whole input voltage range.

    I have attached a draft datasheet update for LM5036 that is not yet available on ti.com. This datasheet has an improved method for selecting the peak current limit components.

    Have you decided what will be the intermediate voltage rail generated by the non-isolated DC/DC boost converter?

    I believe a part like LM5020 would be suitable for the boost converter operated in a simple boost configuration. You may need to use external drivers to boost its power capability. The non-isolated DC/DC group should be able to provide support on this part of the design. You may wish to generate another post covering the non-isolated DC/DC Boost converter only so that you get in contact with them too.

    Thanks

    Joe Leisten

  • 0 in reply to Joe Leisten
    Mastermind 6180 points
    Hi Joe,

    Thanks for your great support!

    BTW, we maybe use UCC28019A as boost controller due to the cost.

    Best Regards,
    C.T.