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:
Apr. 30, 2002
Filed:
Aug. 10, 2000
Applicant:
Inventor:
Eiji Nakagawa, Kyoto, JP;
Assignee:
Rohm Co., Ltd., Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 3/00 ;
U.S. Cl.
CPC ...
H03K 3/00 ;
Abstract
A power drive circuit having push-pull type output transistors connected in series between power supplies. The power drive circuit comprises an idling loop for providing output transistors Q and Q with idling current based on a reference idling current which is increased or decreased in accordance with the currents flowing through the respective output transistors as detected by respective current detecting transistors Q and Q . The invention prevents unnecessary oscillations in the circuit if the output current is very large, without resorting to an oscillation preventive capacitor, thereby enabling a cost saving power drive circuit.