In buck, how to get the loop gain?

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babbage

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In BUCK, if I make use of the voltage-mode control, how to get the loop gian according to the line & load regulation??
For example load regualtion is 10mV/A, Vin=5.0V, Vout=3.0V, Iload=0~500mA, according to this parameters, how to get the loop gian? How to calculate this?
 

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