LT8316 Feedback loop measurement

Dear support,

I would like to measure the feedback loop of LT8316 circuit. The documentation doesn`t provide too much details about compensation and loop measurement. 

I have tried to measure the loop response with a traditional method, by injecting a small isolated AC signal, and measuring the response of the loop (gain and phase).

However, by using the original schematic from the datasheet (the feedback sensing point is directly at the third winding, not rectified voltage), i could not get any useful data.

If the feedback sensing point is moved "after" the diode, so the rectified voltage of the third winding, then the measurement seems to give useful data. 

My question: by replacing the sensing point, does the dynamic response of the circuit change? 

What is the recommended method to measure the loop response of the converter with this LT8316?

Thanks and regards,
MC

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