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:
Aug. 28, 2018
Filed:
Jan. 23, 2017
Fairchild Semiconductor Corporation, Sunnyvale, CA (US);
Philip J. Crawley, Oceanside, CA (US);
Fairchilf Semiconductor Corporation, Phoenix, AZ (US);
Abstract
Generally, this disclosure provides circuitry and methods for determining the output capacitance of an output load capacitor of a power supply. The output capacitance is generally determined by beginning a calibration period and charging an output capacitor with a current source to generate an output voltage. The output voltage may be compared to a reference voltage, and a time period is determined during which the output voltage is less than the reference voltage. The capacitance value, C, of the output capacitor may be determined based on, at least in part, the determined time period. This disclosure also provides circuitry and methods to adjust certain parameters of the power supply based on the determined C value. For example, in a ramp compensation portion of the power supply, the value of a ramp capacitor and/or reset resistor may be adjusted once the value of C is determined. This may enable, for example, increased efficiency, greater stability and increased bandwidth operation of the power supply when the output load capacitor is changed for different applications.