The output voltage of the TPS54531 device is externally adjustable using a resistor divider network. As shown in Figure 8-1, this divider network is comprised of R5 and R6. The relationship of the output voltage to the resistor divider is given by Equation 4 and Equation 5:

Select a value of R5 to be approximately 10 kΩ. Slightly increasing or decreasing the value of R5 can result in closer output-voltage matching when using standard value resistors. In this design, R5 = 10.2 kΩ and R6 = 1.96 kΩ, resulting in a 4.96 V output voltage. The 51.1-Ω resistor, R4, is provided as a convenient location to break the control loop for stability testing.