SLVUAP9B May 2016 – October 2021 TPS54302
1.3.1 Output Voltage Set Point
The voltage divider, R2 and R3, is used to set the output voltage. To change the output voltage of the EVM, it is necessary to change the value of resistor R3. Changing the value of R3 can change the output voltage above 0.596 V. The value of R3 for a specific output voltage can be calculated using Equation 1. Use 100 kΩ for R2.
Equation 1. 
Table 1-3 lists the R2 and R3 values for some common output voltages. Note that VIN must be in a range so that the minimum on-time is greater than 150 ns. The values in Table 1-3 are standard values, not the exact value calculated using Equation 1.
Table 1-3 Recommended Component Values
| VOUT (V) | L (µH) | COUT (µF) | R2 (kΩ) | R3 (kΩ) | C8 (pF) | |
|---|---|---|---|---|---|---|
| 1.8 | 4.7 | 66 | 100 | 49.9 | 33 | |
| 2.5 | 5.6 | 66 | 100 | 31.6 | 47 | |
| 3.3 | 6.8 | 44 | 100 | 22.1 | 47 | |
| 5 | 10 | 44 | 100 | 13.3 | 75 | |
| 12 | 15 | 44 | 100 | 5.23 | 100 | |