SBVS304B June 2017 – October 2021 TPS7A83A
PRODUCTION DATA
The TPS7A83A can be used either with the internal ANY-OUT network or by using external resistors. Using the ANY-OUT network allows the TPS7A83A to be programmed from 0.8 V to 3.95 V. For an output voltage range greater than 3.95 V and up to 5.2 V, external resistors must be used. This configuration is referred to as the adjustable configuration of the TPS7A83A throughout this document. Figure 9-1 shows that the output voltage is set by two resistors. 0.75% accuracy can be achieved with an external BIAS for VIN lower than 2.2 V.
Use Equation 1 to calculate R1 and R2 for any output voltage range. This resistive network must provide a current equal to or greater than 5 μA for dc accuracy. Use an R1 of approximately 12 kΩ to optimize the noise and PSRR.
Table 9-1 shows the resistor combinations required to achieve several common rails using standard 1%-tolerance resistors.
NOMINAL OUTPUT VOLTAGE (V) |
FEEDBACK RESISTOR VALUES | CALCULATED OUTPUT VOLTAGE (V) |
|
---|---|---|---|
R1 (kΩ) | R2 (kΩ) | ||
0.90 | 12.4 | 100 | 0.899 |
0.95 | 12.4 | 66.5 | 0.949 |
1.00 | 12.4 | 49.9 | 0.999 |
1.10 | 12.4 | 33.2 | 1.099 |
1.20 | 12.4 | 24.9 | 1.198 |
1.50 | 12.4 | 14.3 | 1.494 |
1.80 | 12.4 | 10 | 1.798 |
1.90 | 12.1 | 8.87 | 1.890 |
2.50 | 12.4 | 5.9 | 2.480 |
2.85 | 12.1 | 4.75 | 2.838 |
3.00 | 12.1 | 4.42 | 2.990 |
3.30 | 11.8 | 3.74 | 3.324 |
3.60 | 12.1 | 3.48 | 3.582 |
4.50 | 11.8 | 2.55 | 4.502 |
5.00 | 12.4 | 2.37 | 4.985 |