A compensation circuit in a monolithic switching regulator controller
being incorporated in a closed loop feedback system of a switching
regulator includes an amplifier configured in a unity gain feedback
configuration with a first resistor and including a non-inverting input
terminal receiving the feedback voltage and an inverting input terminal
coupled to a first terminal of the switching regulator controller. The
compensation circuit further includes a first capacitor and a third
resistor connected in series between an input terminal and an output
terminal of an error amplifier of the switching regulator controller. The
first capacitor and the third resistor introduce a first zero in the
closed loop feedback system. When a second capacitor is coupled to the
first terminal of the switching regulator controller, a second zero is
introduced in the closed loop feedback system. The second capacitor is an
off-chip capacitor formed external to the monolithic switching regulator
controller.