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Feedback Resistor Calculator for
DC to DC Converters
Here
is a handy Excel spreadsheet that enables you to
calculate the feedback resistor values for a dc to
dc converter.
Feedback
Resistor Calculator
Enter the
feedback voltage in cell B2 (in the FIG below this
is 1.24V).
Then select
Find (from the toolbar) and enter the desired output
voltage in the 'Find What' box.
Click on
'Options >>' then in the Look In box, select Values
from the drop down menu.
Then select
'Find All'. The results will appear in the box
below. Clicking on the 'Value' column enables you to
sort the values found.
Once the
cell with the desired output voltage has been found,
the bottom resistor is marked in blue on the left
and the top resistor is marked in blue at the top.
Resistors
in light blue are part of the E24 series (hence
probably cheaper). Parts in light green are part of
the E48 series (more precise, but more expensive)
FIG 1
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