LIGHT-EMITTING ELEMENT DRIVING DEVICE, LIGHTING DEVICE, AND VEHICLE
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United States of America Patent
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Issued Date -
Jan 11, 2024
app pub date -
Sep 20, 2023
filing date -
Mar 26, 2021
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Abstract
A light-emitting element driving device (5) includes: a first external terminal (SET terminal) connectable to a first setting resistor (Rset); a second external terminal (SET_TH terminal) connectable to a first thermistor (TH1) with a negative coefficient arranged beside a light-emitting element light source (10); a current setter (2) that generates a setting current (Iset) based on the resistance value of the first setting resistor; a current adder (3) that generates an addition current (Iadd) with a negative coefficient to the resistance value of the first thermistor; and a current driver (1) that generates an output current (Iout) that passes through the light-emitting element light source connected between an application terminal for a supply voltage (Vin) and a ground terminal based on a reference current (Iref) which is the sum of the setting current and the addition current.
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