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:
Mar. 13, 2001
Filed:
Sep. 02, 1994
Gregory Allen Blum, West Warwick, RI (US);
Gedaly Levin, Acton, MA (US);
Semiconductor Components Industries, LLC., Phoenix, AZ (US);
Abstract
A method and circuit for reducing the leading edge spike in a current sense signal. The current sense signal is a measure of the current through a switched power device controlled by a switching regulator controller. The slew rate of the current sense signal is limited to prevent the slew rate from exceeding a predetermined maximum. The limited slew rate signal is provided to the switching regulator controller. A transconductance amplifier may be used to limit the slew rate of the current sense signal. A capacitor at the output of the transconductance amplifier contributes to controlling the maximum slew rate of the amplifier. The capacitor is charged by the current output of the amplifier to provide a voltage signal for use in place of the original current sense signal. A switch may be provided for selecting between the slew rate limited current sense signal and the original current sense signal. A time delay may be used to control the switch so that the slew rate limiting is replaced by the original current sense signal after a first predetermined time portion of each “on cycle” of the switched power device.