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1. (WO2018198594) LED DRIVER, AND LED DRIVE CIRCUIT DEVICE AND ELECTRONIC EQUIPMENT THAT USE SAID LED DRIVER

Pub. No.:    WO/2018/198594    International Application No.:    PCT/JP2018/010704
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Tue Mar 20 00:59:59 CET 2018
IPC: H02M 3/155
H05B 37/02
Applicants: ROHM CO., LTD.
ローム株式会社
Inventors: KATSURA Koji
桂 幸司
MURAMATSU Yasunori
村松 泰典
Title: LED DRIVER, AND LED DRIVE CIRCUIT DEVICE AND ELECTRONIC EQUIPMENT THAT USE SAID LED DRIVER
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.