Sure! In a boost converter like the one based on the LT8410EDC-1#TRMPBF, $R1$ is typically part of the feedback network used to regulate the output voltage.
For the LT8410EDC-1#TRMPBF, the feedback network is set up using a voltage divider formed by $R1$ and $R2$, which creates a scaled-down version of the output voltage. This scaled-down voltage is fed back to the feedback pin (FBP) of the IC to ensure stable output.
Here is a breakdown of its role:
Voltage Divider: $R1$ and $R2$ form a voltage divider network.
Feedback Regulation: The divided voltage is fed into the FBP (Feedback Pin) to compare with the internal reference voltage.
Regulating Output Voltage: The IC adjusts the PWM duty cycle of the internal switch to maintain a constant output voltage.
Let's look at the connections:
Connect $R1$:P1 to $C3$:P1 and $IC1$:VREF.
Connect $R1$:P2 to $R2$:P1 and $IC1$:FBP.
The feedback equation can be expressed as: VOUT=VREF(1+R2R1)
where $V_{REF}$ is the reference voltage.
Thus, by selecting appropriate values of $R1$ and $R2$, you can set the desired output voltage. In your case, with $R1$ = 604kΩ and $R2$ = 412kΩ, the output voltage can be determined by rearranging the above formula.
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VOUT=VREF(1+R2R1)
where $V_{REF}$ is the reference voltage.