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TPS53515: About apply external voltage to FB

Part Number: TPS53515

Hi,

Could you tell me about apply external voltage to FB?
Please confirm the attached file.
Customers are considering a configuration like an attachment.
A signal output from the SoC is applied to the FB pin.

TPS53515 .pdf

SoC side introduces mp2143 as a reference.
However, customers want to use TPS53515.

1.Do you know examples of such use?

2.Can TPS53515 use this way?
   Could you tell me the concerns of this configuration.
 
Best Regards,
Yusuke