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. 23, 2002
Filed:
Jul. 28, 2000
Michiaki Yama, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
The invention provides a load driver circuit including at least one FET such as MOSFET QX, QY, and QZ, controlled by a control circuit providing gate control voltage to the load driving FET by means of a feedback loop connecting the FET and the control circuit, without utilizing any resistor connected in series with the load to detect the load current. This is done by detecting, as a measure of the load current Io, the drain-source voltage drop of the load driving FET QX-QZ by means of detection means , and . Because the control circuit utilizes no resistor, but utilizes a MOSFET instead, in detecting load current Io, the invention advantageously has a compact form, requiring only a minimum space for connection with external components, cuts down significant power loss that would be otherwise entailed by a current detection resistor, is capable of detecting the load current at high precision, thereby allowing precise control of the load current, and provides an improved wide output dynamic range.