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Patent Searching and Data


Title:
LED DRIVER, AND LED DRIVE CIRCUIT DEVICE AND ELECTRONIC EQUIPMENT THAT USE SAID LED DRIVER
Document Type and Number:
WIPO Patent Application WO/2018/198594
Kind Code:
A1
Abstract:
An LED driver comprising: an LED constant current source connected to a plurality of LED strings individually with an LED connection terminal interposed therebetween; a selection unit for selecting the LED connection terminal of the LED string, among the plurality of LED strings, for which the LED forward total voltage is greatest as a subsequent detection LED connection terminal; and a comparator for comparing the voltage of the detection LED connection terminal and a first reference voltage; a feedback voltage for which the output voltage has undergone voltage-division undergoing voltage transformation on the basis of the output of the comparator.

Inventors:
KATSURA KOJI (JP)
MURAMATSU YASUNORI (JP)
Application Number:
PCT/JP2018/010704
Publication Date:
November 01, 2018
Filing Date:
March 19, 2018
Export Citation:
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Assignee:
ROHM CO LTD (JP)
International Classes:
H02M3/155; H05B37/02
Foreign References:
JP2012157172A2012-08-16
JP2013021117A2013-01-31
US20120250379A12012-10-04
US20130113445A12013-05-09
JP2012204679A2012-10-22
US20100201278A12010-08-12
Attorney, Agent or Firm:
SANO PATENT OFFICE (JP)
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