So, just a question regarding what you all normally do when selecting resistor values for LM317 adjustable voltage regulators.
Based on the calculations I've made using the formula in the datasheets, and the resistor values I have to work with, I can hit very nearly my target voltages, either a little above or a little below. For instance, with my 3.3 volt rail, depending on which resistors I use in my divider, I calculate I'll either get 3.29 volts or 3.34. Likewise, with the 5 volt rail, it's either 4.97 or 5.06.
What's best practice here? Is it considered best to go a little over voltage, to allow for some sag and power bus resistance? (As long as you remain within spec of your components, obviously.)
If I'm on track here with shooting a little over, what do you normally do when setting your power rail for a small PCB design? (Not trying to send power over long distances here.)
Thanks.