vault backup: 2026-06-24 17:41:24

PCB Design/Music Player/Process.md

@@ -24,4 +24,14 @@ Now calculating for $I_{PEAK}$ using the values
 - $\eta = 0.9$ (efficiency assumption stated in datasheet)
 $$I_{PEAK} = \frac{3.3}{0.9 * (1 - 0.302)} + \frac{{2.304 * 0.302}}{2 * 2.5 * 1.5} = 5.346$$
 The datasheet states to pick an inductor with a saturation current 20% higher than the calculated value which would mean $$I_{sat} \geq 6.415$$
-The [EXLA1V0402-1R5-R](https://www.digikey.com/en/products/detail/eaton-electronics-division/EXLA1V0402-1R5-R/16893520) has a saturation current of 6.7A which should be a good value for this application. The DC resistance is also low and comparable to the options listed in the datasheet.
+The [EXLA1V0402-1R5-R](https://www.digikey.com/en/products/detail/eaton-electronics-division/EXLA1V0402-1R5-R/16893520) has a saturation current of 6.7A which should be a good value for this application. The DC resistance is also low and comparable to the options listed in the datasheet.
+### Output Capacitors
+The datasheet states no major considerations except for capacity and being small and ceramic. Either ones I already have or any 22uF ceramic capacitor will be used.
+### Input Capacitors
+Other than being X5R or X7R no other major considerations are needed for the input capacitors.
+### Output Voltage Selection
+Since 3.3V are needed the values of 180K and 1M will be used for the feedback voltage divider as stated in the table of common output voltage values in the datasheet.
+
+| $V_{OUT}$ | $R1$        | $R2$          |
+| --------- | ----------- | ------------- |
+| 3.3 V     | 1 M$\Omega$ | 180 k$\Omega$ |