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:
Dec. 20, 2011
Filed:
Oct. 09, 2007
Weihong Qiu, San Jose, CA (US);
Kun Xing, Cary, NC (US);
Weihong Qiu, San Jose, CA (US);
Kun Xing, Cary, NC (US);
Intersil Americas Inc., Milpitas, CA (US);
Abstract
A modulator circuit for a switching regulator including first and second ramp generators, a comparator circuit and a reset circuit. The switching regulator provides a compensation voltage indicative of output voltage error. The ramp generators generate leading- and trailing-edge ramp voltages which are compared to the compensation voltage for determining pulses on a pulse modulation signal. The reset circuit prevents the leading-edge ramp voltage from resetting if the leading-edge ramp voltage has not reached the compensation voltage while ramping. The reset circuit further clamps the leading-edge ramp voltage until the pulse modulation signal is asserted again. In a multiphase configuration, each leading-edge ramp voltage is suspended if any leading-edge ramp voltage is clamped. An offset voltage may be added to the compensation, leading-edge, or trailing-edge voltages when a mode select signal indicates a reduced load condition. The offset voltage may be adjusted based on various operating conditions.