Title :
Synthetic-ripple modulator for synchronous buck converter
Author :
Ngo, Khai D T ; Mishra, Santanu K. ; Walters, Mike
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Florida, Gainesville, FL, USA
Abstract :
Comprising a hysteretic comparator and a ripple synthesizer, the synthetic-ripple modulator (SRM) allows voltage-hysteretic modulation to be realized in low-voltage buck converters where the natural voltage ripple is too small for reliable hysteretic operation. Circuit implementation, steady-state operation, and design equations are described for an SRM controlling a buck dc-dc converter. The basics are verified experimentally by a buck converter switched at 420 kHz and delivering 10 A at 1.8 V.
Keywords :
DC-DC power convertors; PWM power convertors; comparators (circuits); modulators; voltage regulators; 1.8 V; 10 A; 420 kHz; DC-DC converter; hysteretic comparator; ripple control; synchronous buck converter; synthetic-ripple modulator; voltage regulator; voltage-hysteretic modulation; Buck converters; Capacitors; Circuits; Hysteresis; Inductors; Pulse width modulation; Pulse width modulation converters; Steady-state; Synthesizers; Voltage; Buck converter; hysteretic modulation; ripple control; voltage regulator module;
Journal_Title :
Power Electronics Letters, IEEE
DOI :
10.1109/LPEL.2005.863604
