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. 28, 2010
Filed:
Apr. 24, 2008
Chia-min Chen, Hsinchu, TW;
Ming-hong Jian, Hsinchu, TW;
Chia-Min Chen, Hsinchu, TW;
Ming-Hong Jian, Hsinchu, TW;
Holtek Semiconductor Inc., Hsinchu, TW;
Abstract
A power IC with an over-current protection receives an input voltage and converts the input voltage into an output voltage to a load. The present invention controls a power transistor to provide an output current to the load, and uses the output control unit to control the power transistor. Furthermore, the over-current protection circuit has a constant current limit threshold and a fold-back current limit threshold for controlling the power transistor. When the output current is larger than the constant current limit threshold, the output current is clamped to a constant current value to descend the output voltage to a rated value. When the output current is larger than the fold-back current limit threshold, the output current is limited to a low current value to descend the output voltage to zero. Thereby, the inner circuit of the power IC and the load are protected.