SLUSDX1 September 2020 TPS563211
The output voltage is set with a resistor divider from the output node to the FB pin. TI recommends using 1% tolerance or better divider resistors. Referring to the application schematic of Figure 8-1, start with 10 kΩ or 20 kΩ for R9 and use Equation 11 to calculate R8. To improve efficiency at light loads, consider using larger value resistors. If the values are too high, the regulator is more susceptible to noise and voltage errors from the FB input current are noticeable.
Table 8-2 shows the recommended components value for common output voltages.