SLVU300A June 2009 – October 2021 TPS54325
1.3.1 Output Voltage Set Point
The output voltage of the EVM is set using the voltage divider of R1 + R4 and R2. To change the output voltage of the EVMs, it is necessary to change the value of resistors R1 and R4 while leaving R2 fixed. Changing the value of R1 and R4 can change the output voltage above 0.765 V.The value of R1 and R4 for a specific output voltage basically can be calculated using Equation 1.
Equation 1. 
Table 1-3 lists the each R1 and R4 value for some common output voltages. C9 is used for faster load transient response and is not normally used. Note that the values given in Table 1-3 are standard values, and not the exact value calculated using Table 1-3.
Table 1-3 Output Voltages
| Output Voltage (V) | R1(Ω) | R4(Ω) | R2(Ω) | C9(pF) | L1(H) |
|---|---|---|---|---|---|
| 1.0 | 6.8 k | 100 | 22 k | 1..5 μ | |
| 1.05 | 8.2 k | 220 | 22 k | 1.5 μ | |
| 1.2 | 12 k | 820 | 22 k | 1.5 μ | |
| 1.8 | 27 k | 3.0 k | 22 k | 10 - 22 | 2.2 μ |
| 2.5 | 47 k | 3.0 k | 22 k | 10 - 22 | 2.2 μ |
| 3.3 | 68 k | 4.7 k | 22 k | 10 - 22 | 2.2 μ |
| 5 | 120 k | 1.2 k | 22 k | 10 - 22 | 3.3 μ |