SLVS839F July 2008 – October 2014 TPS54331
The output voltage of the TPS54331 device is externally adjustable using a resistor divider network. As shown in Figure 10, 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, R4 = 10.2 kΩ and R = 3.24 kΩ, resulting in a 3.31-V output voltage. The 0-Ω resistor, R4, is provided as a convenient location to break the control loop for stability testing.