Accurate adjustable current overshoot circuit
AssigneeTexas Instruments Incorporated
InventorDAVID K. LACOMBE
Life of this patent
Estimating the term…
Abstract
A write driver controls current path for current of an H-bridge circuit. The H-bridge circuit is controlled by a differential pair switch for adjusting a voltage between the differential pair switch between a first voltage when the H-bridge circuit is switched and a second voltage after the H-bridge circuit is switched.
Claims11
A write driver for controlling a current path for an inductive load, comprising:
- an H-bridge circuit for supplying said current to said inductive load;
- a current circuit to generate said current for said current path;
- and
- a differential pair switch in a first position when said current path is switched and a second position after said current path has been switched.
A system for reading and writing information on a disk, comprising:
- a read/write circuit for reading and writing data on a disk;
- a preamplifier for amplifying the data read from disk;
- a read channel for conditioning the data;
- and
- a controller for communicating with a host system, wherein said read/write circuit includes:
- an H-bridge circuit for supplying said current to said inductive load;
- a current circuit to generate said current for said current path, said current circuit including CMOS devices;
- and
- a differential pair switch in a first position when said current path is switched and a second position after said current path has been switched.
An H-bridge circuit having a current summation node to source or sink current at base or gate of a lower H-bridge circuit, thus increasing base or gate voltage and increasing or decreasing coil current.
Dependencies are inferred from the claim text.