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:
Jun. 09, 2015
Filed:
Apr. 05, 2013
Rohm Co., Ltd., Kyoto-shi, Kyoto, JP;
Yoshito Otaguro, Kyoto, JP;
ROHM CO., LTD., , JP;
Abstract
A motor drive device has a spindle motor driver adapted to drive a spindle motor. the spindle motor driver includes lower side NMOSFETs, one for each phase, which connect and disconnect terminals, one for each phase, of the spindle motor to and from a ground terminal; a controller adapted to generate a switch control signal and a brake control signal; lower side pre-drivers, one for each phase, connected between an application terminal of an internal power supply voltage and the ground terminal and adapted to generate lower side gate signals, one for each phase, in accordance with the switch control signal to output the lower side gate signals to the lower side NMOSFETs, one for each phase; and a brake unit adapted to pull up to the internal power supply voltage all the lower side gate signals, one for each phase, in accordance with the brake control signal.
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