TPS548A20 / RF pin

Hi John-san,

Thank you for your reply.
Could you please answer the following question?

>In addition, it seems there is relationship between the switching frequency and resistor divider in datasheet.
>Which page should I see?  

My customer is considering to design TPS548A20 and needs the information above.

Best Regards,
Yaita / Japan disty

Can you be more specific?  Which resistor divider?

John-san,

It is the following red underlined part in datasheet.



Best Regards,
Yaita

John-san,

In page 5, I can see the resistor value of R_RF.



Does R_RF correspond to the following R5?
I doubt it doesn't because R5 isn't "resistor divider".. Could you please clarify it?



Best Regards,
Yaita

According to table 4, the fsw of typical application (Figure 40) is 1MHz.
Did you say R15(=105kΩ) corresponds to R_RF > 0.557?

Best Regards,
Yaita

John-san,

My customer needs the information, so your support would be really appreciated.

Best Regards,
Yaita

I found the following in TPS548A20EVM User's Guide.
I will inform the information to my customer.



Best Regards,
Yaita

Hi Yaita,

   Can you tell me how to calculate TPS548A20 's output impedance?

Thanks,

Tony