High efficiency white LED driving circuit uses the single-cell lithium battery as the power

Published:2011/6/21 8:47:00 Author:TaoXi | Keyword: High efficiency, white LED, driving circuit, single-cell, lithium battery | From:SeekIC

The white LED driving circuit is composed of the white LED driver and the external circuits (includes the transistor, the diode, the inductor, the capacitor and the resistor). The white LED driving circuit needs a constant current source, the current is 15mA～20mA. The luminance of the LED depends on the positive current, so we use some white LEDs in series to ensure every white LED has the same current. The four series white LEDs need 14V voltage, by using the step-up voltage stabilizer to promote the operating voltage of the single-cell lithium battery (2.7V～4.2V), we can get this 14V voltage. The high efficiency white LED driving circuit that uses the single-cell lithium battery (2.7V～4.2V) as the power is as shown in the figure.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Control_Circuit/High_efficiency_white_LED_driving_circuit_uses_the_single_cell_lithium_battery_as_the_power.html

Print this Page | Comments | Reading(3)