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I have been reading the data of this Buck converter model, but on the block diagram scheme. I don't understand what does the indicated feedback loop do.

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The buck Convert model is LM5165-Q1 and this is the link the datasheet.

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  • \$\begingroup\$ The voltage feedback? Measures the output and compensates the duty cycle to keep the output voltage at the desired value. \$\endgroup\$ – Claudio Avi Chami Apr 17 '16 at 18:07
  • \$\begingroup\$ fwiw, the highlighted low side nmos is not part of the feedback loop. \$\endgroup\$ – Vladimir Cravero Apr 17 '16 at 20:56
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In simple terms the output of a synchronous buck regulator is input supply voltage x duty cycle. So, for a given duty cycle the output voltage follows the input voltage by this factor (duty cycle).

This doesn't make a very good regulator so feedback is used that measures the output voltage against a reference voltage and adjusts the duty cycle so that the output voltage is correct.

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