The resistors labeled R_fb1 and R_fb2 create a voltage divider from V_OUT to FB and FB to GND that is used to set the nominal output voltage of the regulator. Nominally, the output of the LM27402 evaluation board is set to 1.5 V using resistor values of R_fb1 = 20.0 kΩ and R_fb2 = 13.3 kΩ. If a different output voltage is required, the value of R_fb2 can be adjusted according to the equation:

Equation 15.

R_fb1 does not need to be changed from its value of 20.0 kΩ.