TPS543B20: About loop characteristics of Remote Sensing with feedback resistors and without feedback resistors

Hi,

Could you tell me about TPS543B20 Feedback loop?
Customer made an evaluation  following conditions.

Obviously characteristics (Phase characteristics etc..) are different between the two output voltage setting method.
Please tell me the difference in behavior between using VSELL and using FB resistors.
I want to know the difference of internal control and information of mode change.







Best Regards,
Yusuke / Japan Disty