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Title:
COIL LOAD DRIVING CIRCUIT AND OPTICAL DISC DEVICE
Document Type and Number:
WIPO Patent Application WO/2005/117250
Kind Code:
A1
Abstract:
A coil load driving circuit capable of suppressing occurrence of radiant noise when a motor is at rest. The coil load driving circuit (1) comprises output buffers (11,12) for outputting PWM pulses to the two terminals of a motor (5); a transfer voltage generating circuit (17) for outputting transfer voltages (VTR1,VTR2) proportional to the difference between an input control voltage (VIN) and an input reference voltage (VREF); PWM comparators (14,15) for outputting PWM signals (PW1,PW2) corresponding to the transfer voltages (VTR1,VTR2); and an output PWM pulse combining circuit (16) for controlling the output buffer (11) by use of the AND signal between the PWM signal (PW1) and the exclusive-OR signal (EX) between the PWM signals (PW1,PW2) and for controlling the output buffer (12) by use of the AND signal between the PWM signal (PW2) and the exclusive-OR signal (EX).

Inventors:
Okubo, Toshiro c/o ROHM CO. (LTD 21, Saiin Mizosaki-cho, Ukyo-k, Kyoto-shi Kyoto 85, 61585, JP)
Application Number:
PCT/JP2005/009608
Publication Date:
December 08, 2005
Filing Date:
May 26, 2005
Export Citation:
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Assignee:
ROHM CO., LTD (21 Saiin Mizosaki-cho, Ukyo-ku Kyoto-shi Kyoto, 85, 61585, JP)
Okubo, Toshiro c/o ROHM CO. (LTD 21, Saiin Mizosaki-cho, Ukyo-k, Kyoto-shi Kyoto 85, 61585, JP)
International Classes:
G11B7/09; G11B7/08; H02P7/00; H02P25/06; H02P29/00; (IPC1-7): H02P7/00; G11B7/09
Foreign References:
JP2001156611A2001-06-08
JP2003164194A2003-06-06
JP2000245192A2000-09-08
Attorney, Agent or Firm:
Fujikawa, Tsuneo (KONAN PATENT OFFICE 9-82, Ichiriyama 4-chome Otsu-shi Shiga, 53, 52021, JP)
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