Small signal modeling of dual-edge PWM modulator with fixed clock frequency

摘要

In this paper, the describing function approach is used to model a dual-edge PWM modulator with a fixed clock frequency. A detailed PWM modulator circuit configuration is introduced with the derivation of the model. Good matching is observed when comparing the analytical model and SIMPLIS simulation. System level analysis demonstrates the advantages of the proposed model versus a conventional average model. The proposed model enables a more accurate compensator design for predicting the dynamic characteristics of the entire system.