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. 03, 2012
Filed:
Nov. 24, 2008
Applicant:
Ming-hong Jian, Hsinchu, TW;
Inventor:
Ming-Hong Jian, Hsinchu, TW;
Assignee:
Holtek Semiconductor Inc., Hsinchu, TW;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H02H 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention mainly relates to a voltage regulator, comprising: a P typed power MOS; a feedback circuit; a differential amplifier; a protecting circuit having a N-typed transistor current mirror; and an active foldback current limiting circuit rather than using a resistor. When the P typed power MOS is under short circuit current situation, the current at the output side of the current mirror is increased in order to limit the current flown through the power MOS. Meanwhile, the same purpose can also be served by increasing the current at the input side of the DC current mirror.