U1 is configured for evaluation of the adjustable output version. This unit is configured for 3.3 V. Resistors R1 and R2 are used to set the output voltage between 1.2 V and 16 V. See the TPS62110 datasheet (SLVS585) for recommended values. The feedforward capacitor C3 may also need to be changed. For more information see the data sheet.