Led Driver Circuit Using Transistor

This circuit allows you to use any voltage between 2v and 24v to drive almost any type of led with power consumption up to 5w.

Led driver circuit using transistor. When the switch of the circuit is open no current flows to the base of the transistor. The schematic of the led driver circuit we will build is shown below. You then have the choice of implementing your driver circuits using discrete transistors or transistors integrated in a semiconductor integrated circuit ic with other led related functionality. High power led driver circuits.

The t2 transistor can be bc547 if you use only usual leds the 20ma versions but it is recommended to use bd135 bd137 or bd139 because they have a higher power dissipation. One typical circuit topology used to drive leds is the linear topology in which the transistor operates in the linear region. Usually the signal from a microcontroller or logic gate does not possess sufficient drive current to power an led directly. If the led has a higher power requirement then it is best to use an npn transistor as a driver.

Much higher dropout of 2 4v which will significantly reduce efficiency when powering only 1 led. The future of lighting. Bipolar junction transistors need base current and sufficient positive voltage to the collector in order to provide amplification. Therefore the transistor cannot turn on.