Rapid transient response circuit applied to DC-DC converter chips

摘要

To disclose a rapid transient response circuit applied to a current mode buck type DC-DC converter chip.SOLUTION: A circuit includes: an error amplifier, a limiter circuit, a multiplexer and a transient detection circuit, where the error amplifier is connected with an external feedback input, amplifies the external feedback, and outputs a voltage stable signal; the limiter circuit is connected with the error amplifier, upper limit voltage of the limiter circuit is VH, lower limiter circuit is VL, and the limiter circuit limits the output voltage stable signal of the error amplifier between the VL and VH; the multiplexer is connected with the limiter circuit, and sets the output voltage stable signal of the error amplifier at the VL or VH; and the transient detection circuit is connected with the error amplifier, and detects an internal node of the error amplifier. The circuit has such merits that power consumption is low, stability is good, excellent in transient response, and the like.SELECTED DRAWING: Figure 1