Scheduled System Maintenance:
Some services will be unavailable Sunday, March 29th through Monday, March 30th. We apologize for the inconvenience.
By Topic

Fast mode-switching technique in hrbrid-mode operation

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

The purchase and pricing options are temporarily unavailable. Please try again later.
4 Author(s)
Chi-Lin Chen ; Dept. of Electr. & Control Eng., Nat. Chiao Tung Univ., Hsinchu ; Wei-Lun Hsieh ; Han-Hsiang Huang ; Ke-Horng Chen

A fast mode-switching technique between pulse width modulation (PWM) and pulse frequency modulation (PFM) modes is proposed to keep high efficiency over wide load range. Load dependent zero-current detector (ZCD) can effectively speed up the transition from PWM to PFM mode. Especially, the overshoot voltage can be minimized by using the reversed current provided by the ZCD circuit. Furthermore, the undershoot voltage of the transition from PFM to PWM mode can be reduced because the recovery time can be reduced by restoring the output voltage of the error amplifier. Thus, the efficiency of current mode DC-DC buck converter is higher than 88% at light loads and the recovery time is smaller than 35 mus when load current changes from 500mA to 10mA suddenly.

Published in:

Circuits and Systems, 2008. MWSCAS 2008. 51st Midwest Symposium on

Date of Conference:

10-13 Aug. 2008