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:
Jan. 04, 2000
Filed:
Feb. 03, 1998
Philips Electronics North America Corporation, New York, NY (US);
Abstract
In a switched-mode power supply, when the controller and the switching device are encapsulated together with a heat sink, in which the drain of the switching device is connected to the heat sink, the heat sink and the paths to the various pins of the controller forms various parasitic capacitances which, when the switching device switches injects inordinately large currents into the pins of the controller. In the case of the D.sub.MAG input, this may result in throwing the switched-mode power supply out of regulation. The sample-and-hold circuit connected to the D.sub.MAG input includes an additional comparator for comparing the current on the D.sub.MAG input to an extra large current. If the current on the D.sub.MAG input exceeds this extra large current, the sampling switch of the sample-and-hold circuit is held open while a clamp circuit is engaged on the D.sub.MAG input.