Open AccessLoad current‐sensing circuit integrated in high‐frequency PWM/PFM hybrid DC–DC buck converter
Author(s) -
Yuan Bing,
Lai Xinquan,
Liu Yuxin
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2013.4206
Subject(s) - pulse width modulation , pulse frequency modulation , duty cycle , buck converter , modulation (music) , voltage , materials science , electrical engineering , pulse (music) , physics , engineering , pulse amplitude modulation , acoustics
An average current‐sensing circuit integrated in a hybrid DC–DC buck converter is presented. Both the high‐side and the low‐side switch currents are fully sensed by detecting the filtered smooth voltage of the switch node, which maintains a substantially constant mode changing point and seamless transition between pulse width modulation (PWM) and pulse frequency modulation (PFM) under various duty cycles. The achieved mode changing point is almost independent of temperature and supply voltage. The proposed circuit is suitable for high‐frequency hybrid DC–DC applications.