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:
May. 15, 1990
Filed:
Jun. 21, 1989
Applicant:
Inventor:
Matsuro Koterasawa, Osaka, JP;
Assignee:
National Semiconductor Corporation, Santa Clara, CA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05F / ;
U.S. Cl.
CPC ...
323274 ; 323268 ; 323273 ;
Abstract
A circuit is shown in which a voltage regulator has an output stage that operates as a Darlington when the input-output differential exceeds a threshold. The circuit automatically switches to a common emitter output and an emitter-follower driver when the differential falls below the threshold. A current limiter prevents excessive common current when the output transistor is saturated.