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SN6505A: Can SN6505A be used with VIN 3.3V and 5V transformer center tap ?

Kazuya Nakai59
Guru 21775 points
Part Number: SN6505A


 Hello guys,

 One of our customers is considering useing SN6505A. They'd like to use the device with 3.3V VIN and  5V transformer center tap. Could you please tell me whether this usage is no problem or not?

Your reply would be much appreciated.

 Best regards,

 Kazuya Nakai.

  • 0
    TI__Guru 55885 points

    Hi Kazuya-san,

    Thank you for using E2E Forum. The answer to your question is yes, a center-tapped transformer can be used with SN6505A to generate 5V from 3.3V supply. Example transformer options are shown for various voltage/current configurations in Table 3 of SN6505 datasheet (also copied below). You can use any of the transformers listed in the datasheet or if you have a different preferred transformer vendor then you can choose transformers from your vendor with the specifications given in Table 3 of SN6505 datasheet.

    Let me know if you have any other questions, thanks.

    Regards,

    Koteshwar Rao

  • 0 in reply to Koteshwar Rao
    Guru 21775 points
    Hi Koteshwar,

    Thank you for the prompt reply!

    Could I ask you a question again to make sure my understanding is correct or not because VCC of SN6505A is connected to the center tap of transformer in the device datasheet?
    The customer wants to supply 3.3V to VCC of SN6505. But they wants to supply 5V to transformer center tap without connection between VCC terminal and the center tap of transformer. The usage is no problem?

    Thank you again and best regards,
    Kazuya Nakai.
  • 0 in reply to Kazuya Nakai59
    TI__Guru 55885 points
    Hi Kazuya,

    Thanks for reiterating & clarifying your question and I am sorry that I miss understood your question earlier. Yes using 3.3V for VCC of SN6505 and 5V for the center-tap of transformer on the primary side is absolutely fine. As long as the voltage at D1 & D2 doesn't exceed the abs max value of 16V, you can use this configuration and there shouldn't be any issues in doing so. Thanks.


    Regards,
    Koteshwar Rao
  • 0 in reply to Koteshwar Rao
    Guru 21775 points
    Hi Koteshwar,

    Thank you very much for your help.

    Best regards,
    Kazuya Nakai.