**11. Conclusions**

A PWFM control strategy is presented herein by combining the one-comparator counter-based DPWM control with PFM control to increase pseudo-1-bit resolution under constant-frequency operation. By doing so, as compared with the traditional PWM control strategy, system stability will be enhanced, including no limit cycle oscillation although both have almost the same transient responses. Above all, the difference in internal structure between the two is quite small, and the circuit complexity and chip area are not altered. In the future, the number of bits for DPWM and PFM will be investigated to shorten the transient time.

**Author Contributions:** The conception was presented by K.I.H., who also was responsible for editing this paper. C.W.W. carried out experimental setup and verification. Y.T.Y. surveyed the existing papers and wrote the software program. K.I.H. was in charge of project administration.

**Funding:** This research was funded by the Ministry of Science and Technology, Taiwan, under the Grant Number MOST 107-2221-E-027-023.

**Acknowledgments:** The authors gratefully acknowledge the support of the Ministry of Science and Technology, Taiwan, under the Grant Number MOST 107-2221-E-027-023.

**Conflicts of Interest:** The authors declare no conflict of interest with commerce.
