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SN6505B: Typical application transformer issue

Anton Zyma
Prodigy 40 points
Part Number: SN6505B


Hello!

I have an isolated power supply with an LDO and up to 5V 1A output. Input voltage is also 5V. Recommended transformer DA2303-ALD is out of stock. I couldn’t find any equivalents for it with the same case. Could you please specify any equivalents?

Yours sincerely,

Anton Zyma

  • 0
    TI__Genius 17100 points

    Hi Anton,

    Thank you for posting, and welcome to E2E! By "the same case," does it mean you are looking for transformers with the same package and body style as DA2303-ALD?

    An acceptable transformer substitute for 5V, 1A outputs given an SN6505B system and 5V input is Würth's 750316028 transformer. The turns ratio is higher on this part than DA2303-ALD, so current output will be ~13% less (588mA vs. 666mA).

    Is this current capability too low for the power supply's requirements?


    Best,
    Manuel Chavez

  • 0 in reply to Manuel Chavez
    Prodigy 40 points

    Yes, exactly, by the same case I meant the package style and body style, because I have the PCB made for DA2303-ALD. Unfortunately, 588mA may be too low for my application.

  • 0 in reply to Anton Zyma
    TI__Genius 17100 points

    Hi Anton,

    Unfortunately this is a unique layout footprint and package by Coilcraft. Commercially available transformers of comparable size are either too large or lack sufficient output power capabilities for substitution here.

    Is this replacement transformer needed for testing only?


    Thank you,
    Manuel Chavez

  • 0 in reply to Manuel Chavez
    Prodigy 40 points

    Hi Manuel,

    Oh, such a pity. Yes, it is for the prototype of the new device. So, I’ll try my best to find the appropriate equivalent and change transformer’s footprint for the future release.

    Thank you for your help!

    Yours faithfully,

    Anton Zyma

  • 0 in reply to Anton Zyma
    TI__Genius 17100 points

    Anton,

    You're very welcome! If a larger transformer footprint is chosen, different packages can be incorporated for debug purposes by bending leads or soldering wire between leads and pads :) Some transformer vendors, including Coilcraft, are willing to create custom transformers in various packages on a case-by-case basis.

    Feel free to contact any vendor and ask! Thanks again for posting to E2E.


    Respectfully,
    Manuel Chavez

  • 0 in reply to Manuel Chavez
    Prodigy 40 points

    Manuel,

    Soldering wire between leads and pads is actually what I’m thinking about :)

    Yours faithfully,

    Anton Zyma

  • 0 in reply to Anton Zyma
    TI__Genius 17100 points

    Hi Anton,

    Please let us know the result! As a precaution, do note that soldering wire between leads and pads may effect or compromise the isolation barrier. Do take care to keep isolated and non-isolated voltages separated by the necessary creepage and clearance distances.


    Have a great week! :)


    Best,
    Manuel Chavez