Hysteretic controlled buck converter with switching frequency insensitive to input/output voltage ratio

This paper proposes a hysteretic control buck converter with constant switching frequency. There even when the input/output voltage ratio in the steady changes, the switching frequency does not change (only on-time changes). On the other hand, when the load changes in the transient state, the switching frequency changes for quick response. We have designed and simulated the proposed circuit, and confirmed its operation.