LED drive circuit

Details LED drive circuit LED drive circuit

2005-07-22

2010-10-12

Patel, Rajnikant B (Department: 2838)

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

C327S108000, C327S535000

Reexamination Certificate

active

07812587

ABSTRACT:
An LED driving circuit can improve characteristics. A first current increasing circuit10i4is constituted of a first slow regulating unit10i41and a post-stage first supplying circuit10i43and, from a point in time of output switching of a first comparator10i2, that is, when a set temperature exceeding a reference potential Va is attained, gradually increases a temperature compensated current IT1(ΔI1) and thereby suppresses the lowering of emission output. Here, by gradually increasing the temperature compensated current IT1by making use of charging/discharging functions of a capacitor, etc., that is, by increasing the temperature compensated current IT1over a longer time than a pulse width that a photodetecting element, onto which light from an LED11is made incident, can respond within, pulse width distortion and jitter can be suppressed.

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