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:
Oct. 02, 2012
Filed:
Aug. 26, 2009
Jason Yigang Guo, Cupertino, CA (US);
Jason Yigang Guo, Cupertino, CA (US);
Fairchild Semiconductor Corporation, South Portland, ME (US);
Abstract
A pulse width modulation (PWM) DC operating point of a voltage regulator is configured to be relatively independent of an input voltage and an output voltage of the regulator. A drive transistor of the regulator is periodically switched ON to couple the input voltage to an output capacitor to generate the output voltage. A ramp signal is generated by dividing a signal generated from the input voltage with another signal generated from the output voltage and using the resulting signal to charge a capacitor. The ramp signal is compared to an error voltage indicative of a level of the output voltage to determine when to switch OFF the drive transistor.