The phase boost is proportional to the separation of the zero-pole pair in the
error amplifier, but that is of secondary nature since the error amplifier’s pole
and zero were placed to compensate the worst case zero and pole in the control-
to-output characteristics. The actual location of the zero caused by the ESR,
which amounts to the choice of a vendor and part number, will affect the amount
of excess phase the supply will exhibit. So the designer may have to relocate the
compensating pole if there is any possibility that the excess phase will fall to less
that 30 degrees (-330 degree lag).
B.4.42-Pole–2-Zero Compensation
This compensation is ...
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