Abstract：The dynamic performance of digital controlled DC/DC converter is not as good as analog controller since there exits intrinsic delay in digital control loop. An analog-digital mixed compensation method to improve the dynamic performance of DC/DC converter is presented in this paper. It is based on phase lead compensation to boost the phase margin. So the peak to peak output voltage deviation due to changes of load current or line voltage can be decreased. A digital controlled synchronous Buck converter prototype was built. Performance of the converter with different voltage-mode compensators were tested and compared. It is demonstrated that the analog-digital mixed compensator has merits of simplicity and good dynamic performance. It can be applied with the commercial digital controller chip to further improve the dynamic performance of DC/DC converters.
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