SLVSAF1E October 2010 – May 2019 TPS54388-Q1
A resistor divider from the output node to the VSENSE pin sets the output voltage. TI recommends using divider resistors with 1% tolerance or better. Start with 100 kΩ for the R1 resistor and use Equation 1 to calculate R2. 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 VSENSE input current are noticeable.