SLUU224A May 2005 – March 2022 TPS40100
The regulated output voltage can be adjusted by changing the values of the feedback resistors, R1 and R3. R19 and R17 are located in the feedback to provide the user with positive remote sense and the ability to perform loop analysis with a frequency/gain analyzer. Resistors R12 and the parallel combination of R1 and R3 are the dominant resistors associated with setting the output voltage. The following are the equations associated for establishing the output voltage.
where
R1//R3 can be adjusted to provide user defined output voltages. Table 5-1 contains values for R1//R3 to generate popular output voltages.
VOUT | R1//R3 (RPARALLEL) | R1 | R3 |
---|---|---|---|
3.3 V | 4.82 k | 12.4 k | 7.87 k |
2.5 V | 6.95 k | 7.15 k | 237 k |
2.2 V | 8.33 k | 8.66 k | 205 k |
2.0 V | 9.61 k | 10.0 k | 237 k |
1.8 V | 11.34 k | 12.1 k | 178 k |
1.5 V | 15.55 k | 16.2 k | 365 k |
1.2 V | 24.69 k | 26.1 k | 422 k |