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A buck converter operating in PFM mode, mathematical model and simulation analysis

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4 Author(s)
Morra, A. ; Infineon Technol., Padova ; Piselli, M. ; Flaibani, M. ; Gola, A.

This paper describes a possible control method for the operation of a variable switching frequency buck converter. Starting from the ideal model for a Pulse Frequency Modulation (PFM) mode dc-dc converter [1], a simple control system, involving only two comparators and a latch is presented here. A mathematical model for this frequency modulated control system is developed and demonstrated. To prove the theoretical behavior of this model, an alternative to the digital modulator, proposed by F.C. Lee [2], is introduced in order to open the loop and to evaluate the gain and the phase of the system. Results confirm a perfect agreement between the mathematical model and simulations at low frequency. Finally the stability of the converter circuit is demonstrated by forcing a load current step and analyzing the response of the control circuit.

Published in:

Telecommunications Energy Conference, 2007. INTELEC 2007. 29th International

Date of Conference:

Sept. 30 2007-Oct. 4 2007