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:
Sep. 21, 1999
Filed:
Sep. 17, 1998
Davide Giacomini, Valdengo, IT;
STMicroelectronics S.r.l., Agrate Brianza, IT;
Abstract
The turn-on delay of a current mode switching converter is reduced by an error summing block including a window comparator to the input of which is fed the output voltage of the converter before being filtered by the low pass filter and to which a low threshold and high threshold reference voltages are applied, both of which are referred to the reference voltage of the converter. The error summing block also includes a differentiating circuit whose input is coupled to the so defined 'under' output of the window comparator and outputting a pulse of a preestablished duration at the incoming of a rising front of the input signal. Two amplifiers of the same gain K, are also provided, and both are enableable for outputting an amplified signal only when enabled. In addition, two summing circuits are also included. One summing circuit adds the reference signal of the converter (Vref), and the other the feedback signal of the output voltage filtered by the low pass filter to the respective signals amplified by the enabling amplifiers when enabled.