Lighting LED constant current source driver circuit diagram

Published:2013/12/17 2:26:00 Author: | Keyword: Lighting LED constant current source driver circuit diagram, | From:SeekIC

Using this kind of drive circuit, LED directly by the constant current source supply, no feedback, also do not need to compensate, principle as shown in figure 1 Figure 1 LED constant current source driver design In this circuit, the bias voltage source will be poor stability, large ripple coefficient of external power input into stable constant voltage output, a constant voltage will serve as the input of voltage controlled current source, resulting in a stable and constant current output. Constant current source driving scheme is often used in simple structure, no high requirements of LED lighting circuit or implement feedback difficult of the combined model of LED lighting circuit. For example, a red (R), green (G), blue (B) 3 kinds of color chip packaging in a pipe inside of three color leds. The RGB - LED according to the additive principle of light, when each color according to the variety of different numerical combination can realize the true color. Through which according to the LED luminous intensity is proportional to the size of the power flow of this feature, RGB three colors of the change of light intensity, set each color has a Nbit brightness, combine 3 Nbit color, can send out to suit the requirements of true color. As shown in figure 2. Figure 2 tricolor LED driver design



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/Lighting_LED_constant_current_source_driver_circuit_diagram.html

Print this Page | Comments | Reading(3)