Tool/software:
Hi team.
Regarding page 30 of the LMR43606-Q1 datasheet, 8.2.2.2.1 FB for Adjustable Output.
I am considering changing the RFBT and RFBB resistors from the recommended values in the datasheet (1% product) to 49.9kΩ and 12.4kΩ and setting VOUT to 5V output.
However, when calculating the maximum resistance error, it does not fall within the range of [5KΩ＜RFBT || RFBB ≦ 10KΩ] in equation 6.
*It slightly exceeds 10KΩ.
-Is the recommended resistance value wrong?
-Is [5KΩ＜RFBT || RFBB ≦ 10KΩ] wrong?
-Is it acceptable to exceed 10KΩ a little?
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Calculate the maximum values of RFBT and RFBB using the recommended constants (1% resistors) from the data sheet
- RFBT MAX: 49.9kΩ × 101% = 50.399kΩ
- RFBB MAX: 12.4kΩ × 101% = 12.524kΩ
Calculate the parallel resistance
- (50.4kΩ × 12.5kΩ) ÷ (50.4kΩ × 12.5kΩ) = 10.0312kΩ
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