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Need to estimate buck converter efficiency in portable apps?

Posted: 14 Jan 2008
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Keywords: buck converter  Pulse Width Modulation  Pulse Frequency Modulation  portable applications 

Efficiency prediction for a buck converter at Pulse Width Modulation (PWM) mode is well analysed. However, not enough attention has been paid to predict efficiency at Pulse Frequency Modulation (PFM) mode, which is widely used at light loads in portable applications to decrease loss and prolong talk time. In this article, characteristics of PFM operation are examined. System efficiency is then calculated accordingly. Predicted efficiency within the whole operating range is then compared to test results.

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