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. 01, 2002
Filed:
Jan. 31, 2001
Akihiko Ono, Kasugai, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A driver circuit is disclosed, capable of performing a stable damping operation with a simple circuit configuration without the need of external regulation and without being influenced by specification changes and variations in load and driver current IO, wherein, in a damping circuit, a diode-connected transistor and a damping current limiting resistor are connected between an NPN transistor with the base thereof controlled by a damping circuit control signal and an output terminal, likewise, in a damping control circuit, the resistance ratio of ON resistance of a PMOS transistor and a resistor relative to ON resistance of a PMOS transistor and a load resistor is set to m times, and a current ratio of a first bias current relative to a driver constant current circuit is set to (1/N) times, and a relation between a damping control signal and a low potential-side voltage at the output terminal is set to &Dgr;Vdo=((m/N)−1)×RDRV×IO<Vbe 7+Vbe 8, thereby preventing a damping malfunction.