I want to convert the schematics of the design note DER-507 (https://ac-dc.power.com/design-support/reference-designs/design-examples/der-507-175-mw-constant-voltage-universal/) to a 3.3V power supply. As far as I understand, the only thing I need to do is to replace the voltage divider R3 and R4 to an appropriate value. I am planning to keep R3 equal to 2K and changing R4 to 1.3K. With this change, the voltage divider should give me a ratio of 0.606. This number should be sufficient since 0.606 * (5V) = 2V. Are these calculations correct? Would these changes convert the power supply in the design note to a 3.3V power supply?