US 6,335,643 B1 · Driver circuit

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 ΔVdo=((m/N)−1)×RDRV×IO<Vbe 7+Vbe 8, thereby preventing a damping malfunction.

Claims0

Dependent claims

Claims aren’t available for this document.

Facts

Application

09/773,001Filed 31 Jan 2001

Published

US 2002/0008552 A124 Jan 2002

Granted

1 Jan 2002

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

G11B 5/022
Recording, reproducing, or erasing methods; Read, write or erase circuits therefor: h-Bridge head driver circuit, the "H" configuration allowing…
G11B 5/02
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor: recording,…
H03K 17/162
In field-effect transistor switches: without feedback from the output circuit to the control circuit
H03K 17/6872
The output circuit comprising more than one controlled field-effect transistor: using complementary field-effect transistors

Driver circuit

Life of this patent

Driver circuit

Life of this patent

Abstract

Claims0