Title:
SEMICONDUCTOR DEVICE FOR DRIVING LED, AND LED DRIVING DEVICE
Document Type and Number:
WIPO Patent Application WO/2006/075652
Kind Code:
A8
Abstract:
A semiconductor device for driving LED, which has excellent power conversion efficiency and is suitable for miniaturizing, and a LED driving device using such semiconductor device are provided. The semiconductor device for driving LED is provided for driving one or more LEDs, and is characterized in that it is provided with an input terminal connected on a high voltage side of a rectifier circuit for rectifying an alternating voltage and inputting a voltage from the rectifier circuit; an output terminal for applying current to one or more LEDs, a switching element block, which is connected between the input terminal and the output terminal and has a first switching element; a regulator section for forming a power supply voltage for driving and controlling the switching element block; and a drain current detecting section for detecting a drain current of the switching element block. The semiconductor device is further characterized in that it is provided with a control section for controlling the first switching element to be turned on and off to interrupt the drain current of the switching element block when the drain current reaches a prescribed threshold value.
Inventors:
ARAKAWA RYUTARO
HACHIYA YOSHIAKI
KUNIMATSU TAKASHI
FUKUI MINORU
HACHIYA YOSHIAKI
KUNIMATSU TAKASHI
FUKUI MINORU
Application Number:
PCT/JP2006/300276
Publication Date:
August 27, 2009
Filing Date:
January 12, 2006
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
ARAKAWA RYUTARO
HACHIYA YOSHIAKI
KUNIMATSU TAKASHI
FUKUI MINORU
ARAKAWA RYUTARO
HACHIYA YOSHIAKI
KUNIMATSU TAKASHI
FUKUI MINORU
International Classes:
H01L33/00
Attorney, Agent or Firm:
KAWAMIYA, Osamu et al. (IMP Building3-7, Shiromi 1-chome, Chuo-k, Osaka-shi Osaka 01, JP)
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