SLVU942A July 2013 – August 2021 TPS54626
3.1 Output Voltage Set Point
To change the output voltage of the EVMs, it is necessary to change the value of resistor R1. Changing the value of R1 can change the output voltage above 0.765 V. The value of R1 for a specific output voltage can be calculated using Equation 1.
Equation 1. 
Table 3-1 lists the R1 value for some common output voltages. For higher output voltages of 1.8 V or above, a feed forward capacitor (C2) may be required to improve phase margin, and is recommended for auto-skip Eco-mode stability. Pads for this component (C2) are provided on the printed-circuit board. Note that the values given in Table 3-1 are standard values, and not the exact value calculated using Table 3-1.
Table 3-1 Output Voltages
| Output Voltage (V) | R1 (kΩ) | R2 (kΩ) | C2 (pF) | L1 (µH) | C9 + C10 + C11 (µF) | ||
|---|---|---|---|---|---|---|---|
| Min | Typ | Max | |||||
| 1.0 | 6.81 | 22.1 | 5 - 220 | 1.0 | 1.5 | 4.7 | 22 - 68 |
| 1.05 | 8.25 | 22.1 | 5 - 220 | 1.0 | 1.5 | 4.7 | 22 - 68 |
| 1.2 | 12.7 | 22.1 | 5 - 100 | 1.0 | 1.5 | 4.7 | 22 - 68 |
| 1.5 | 21.5 | 22.1 | 5 - 68 | 1.0 | 1.5 | 4.7 | 22 - 68 |
| 1.8 | 30.1 | 22.1 | 5 - 22 | 1.2 | 1.5 | 4.7 | 22 - 68 |
| 2.5 | 49.9 | 22.1 | 5 - 22 | 1.5 | 2.2 | 4.7 | 22 - 68 |
| 3.3 | 73.2 | 22.1 | 5 - 22 | 1.8 | 2.2 | 4.7 | 22 - 68 |
| 5.0 | 124 | 22.1 | 5 - 22 | 2.5 | 3.3 | 4.7 | 22 - 68 |