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SN6507: Transformer from 5Vin to 5Vout (isolation condition, below 1W)

CHOI SEUNG WON
Expert 1060 points
Part Number: SN6507
Other Parts Discussed in Thread: SN6501, SN6505B

Dear TI

I will use sn6507 for 5 to 5 isolation power, below 1W.

i verify sn6507 datasheet and it explain only higher input condition(table 9-3).

if i use sn6507 for 5 to 5 condition, can i use transformer of sn6505 datasheet , page 25?

( for 5 to 5, i want to use sn6505 parts then it is out of stock.  but i can order sn6507)

or explain another design guide or solution for me ?

Best regards, choi

  • 0
    TI__Mastermind 49835 points

    Hi Choi,

    Thanks for reaching out.

    SN6507 can certainly support 5V to 5V operation with suitable transformers. The biggest advantages SN6507 is that it supports input voltages of upto 36V due to this, most of the designs listed in the datasheet are for higher input voltages especially because we already have SN6501 and SN6505 that support designs with 5V inputs.

    If SN6505 based design for 5V @ 200mA current already meets your requirement, then we recommend you to choose SN6505B. But if you like to use the additional features of SN6507 (like duty cycle control, adjustable wide frequency range, slew rate control, adjustable current limit) then you can choose to use SN6507 for your 5V to 5V application.

    The transformers listed in SN6505 datasheet support 160kHz and 420kHz or higher and SN6507 can be operated from 100kHz to 2MHz. Hence, all the transformers of SN6505 can be used with SN6507 provided the switching frequency is chosen accordingly.

    For your application, I can recommend using transformers 760390012 (2.5kVrms), 760390014 (2.5kVrms with LDO) or 750313734 (5kVrms). Please set the switching frequency to 400kHz to use these transformers. Let me know if you have any questions, thanks.


    Regards,
    Koteshwar Rao