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TPS61089: Design help on FB pin

Part Number: TPS61089

Hi Sir,

My customer is creating DFMEA for the following devices.
Could you please clarify this technical inquiry?

・TPS61089RNRR
  R1=330k、R2=36k

・TPS62160DSGR
       R1=220k、R2=68k

Resistors R1 and R2 connected to FB terminals according to the recommended schematic in the datasheet.
1) R1 open
If the FB terminal is connected to GND at R2 (≒Vref), what voltage will the Vout becomes to?
(is this value depends on the gain of the Gm (depending on the feedback resistance)?)
If you have a formula to calculate from R2, please let me know.

2) R2 open
If the FB terminal is connected to GND at R1 (≒Vref), what voltage will the Vout becomes to?
(is this value depends on the gain of the Gm (depending on the feedback resistance)?)
If you have a formula to calculate from R1, please let me know.

Thanks a lot.