Keywords: DC-DC buck converters, synthetic ripple hysteresis control, dynamic hysteretic band modulation, switching frequency, load current changes, simulation, on-chip regulators
A synthetic ripple buck converter with dynamic hysteretic band modulation
This paper presents an integrated DC-DC buck converter using a synthetic ripple hysteresis control scheme with a feed forward path to define the boundary of hysteresis band. The hysteresis band and the switching frequency are adjustable according to load current changes; therefore, it accelerates regulation and reduces overshoot. Full chip simulation indicated that the output voltage recovery time is shortened within 10 µs for load current transients in the range between 100 mA to 500 mA. The present circuit requires no external compensation capacitors and can be implemented with the modern integrated circuit technology for on-chip regulators.