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TIDA-00779: Understanding the boost follower circuit

Part Number: TIDA-00779
Other Parts Discussed in Thread: TIDA-00443

Hello,

Can you please explain how the value of R14 is selected. Neither am I clear of the use of D8. I understand that more the Q4 turns on, the more will R14 will come in parallel with R9 and thus, increasing the reference output voltage. Intuitively it feels correct but how do we derive the relation between Vac(IN) and Vout(REF)?