SN6505A: Request a Review the Design of SN6505A

Hi Louis,

Thanks for reaching out. Please see my inputs below,

Louis Han15 said:

1.Is it available to connect two transformers in parallel? if available, could you review the design?

Yes, two transformers can be connected together to get two separate outputs provided the total input current required by the two transformers doesn't exceed SN6505A current rating.
I couldn't find datasheet for the transformer YETRF0907H-ST / T-YETRF0907H-ST, could you please share the datasheet to review?

Louis Han15 said:

2.Is it available the secondary side of the transformer be separated and used? if available, could you review the design?

Yes, this is also possible. Transformer can have multiple output windings to generate multiple output rails. Please see below application note for examples.

https://www.ti.com/lit/slla436

Louis Han15 said:

3.What can I do to reduce EMI? Could you provide reference design for reduce EMI?

We usually don't hear from customer about SN6505 causing any EMI challenges for any industrial applications. One of the ways to reduce emissions further is to lower the switching frequency. By choosing choosing SN6505A (160kHz) over SN6505B (420kHz), you are already lowering emissions even further. Hence, just using SN6505A should be sufficient to meet your emissions requirement. Thanks.

Regards,
Koteshwar Rao

Hi Koteshwar

Thanks for your support.

We have a additional inquiry.

In the datasheet, recommendations for bulk capacitors at the rectifier output are marked from 1uF to 10uF. 

However, is it available to exceed 10uF as shown in the circuit below?

Best regards