The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 31, 2012
Filed:
Jun. 09, 2008
Shu-ing Ju, Palo Alto, CA (US);
Jayendar Rajagopalan, Newcastle, WA (US);
Rajarshi Paul, Boulder, CO (US);
Jeffry Mark Huard, Puyallup, WA (US);
Shu-Ing Ju, Palo Alto, CA (US);
Jayendar Rajagopalan, Newcastle, WA (US);
Rajarshi Paul, Boulder, CO (US);
Jeffry Mark Huard, Puyallup, WA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
The invention relates to a switching regulator with an error amplifier circuit and a feed-forward circuit. The error amplifier circuit provides an error signal by amplifying the difference between a feedback signal and a reference signal. The feed-forward circuit level-shifts the output of the error amplifier based on the feed-forward input signal and a scaling factor. The resulting adjusted error signal includes both feed-back and feed-forward signal components. A PWM comparator is employed to compare the adjusted error signal to a ramp signal. Switched-mode regulation is performed based on the PWM comparator output. In addition, buck-boost mode transition smoothing circuitry may also be employed to smooth the buck-mode/boost-mode transition in a buck-boost switching regulator.