Fast-transient switching converter with type III compensation

摘要

A circuit configured for improving the large signal response of a control stage circuit of a switch mode DC/DC power converter by increasing the differential input range of an error amplifier by segmenting and adding an offset to the error amplifier input and output. When a transient is detected, the feedback voltage is offset in multiple segments by multiple offset voltage sources to prevent saturation of the control stage circuit. Counteracting offset voltages are added to an output of an error amplifier to prevent overshoot or undershoot. A feed-forward compensation signal is generated with the amplitude of the signal being clamped to fixed voltage levels between a minimum and a maximum amplitude of the feed-forward compensation signal. The feed-forward compensation signal is added to the output of the error amplifier to produce an output error signal of the control stage circuit configured for controlling the modulating of the switch mode DC/DC power converter.