I am trying to build a step-up and step-down circuit from a DC-DC converter IC.
This is from the datasheet:
I have two questions in relation to this:
- The value of the resistor in the red box. It says 0.22. Is this in ohms? 0.22 ohms seems quite peculiar to me.
- Regarding the
Voutcalculation. You can look at the red line in the bottom of the screenshot. It looks like
Voutis calculated by selecting values only for the
R2resistors. Is this correct? Shouldn't
Vinbe taken into consideration as well?