Abstract：Subharmonic oscillation will exist when ceramic capacitors are used as the output filter capacitors of ripple-based constant on-time (RBCOT) Buck converter. A novel on-chip ripple compensation scheme is proposed in the paper to alleviate such problem. This ripple compensation scheme can enhance system stability without adding any IC peripheral components and has good transient response performance. Describing function (DF) method is used to derive the small-signal model and analyze the stability of the proposed ripple compensation scheme. Simplis simulation results verify the system model and stability criterion derived. The experimental results further validate the theoretical analysis.
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2018, Vol. 33 
