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TPS61080: not possible to adjust Vout to 10V.

Part Number: TPS61080

Dear all,

I try to evaluate the TPS61080 as Boost regulator to generate Vout 10V from a Vin=5V source. 

The datasheet under 8.3. is mentioned, that Vout is able to adjust from VIN to 27V. 

I have choosen an FB devider of R1=335k, R2=47k to reach the 10V, but it seems that the device output volted can not be adjusted to values lower than 11.5V.

is this correct, or do you have a hint to adjust the voltage to 10V.

thx,

Chris