Led Driver Circuit Using Transistor

The schematic of the led driver circuit we will build is shown below.

Led driver circuit using transistor.

High power led driver circuits. 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. Therefore the transistor cannot turn on. When the switch of the circuit is open no current flows to the base of the transistor.

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. Much higher dropout of 2 4v which will significantly reduce efficiency when powering only 1 led. Bipolar junction transistors need base current and sufficient positive voltage to the collector in order to provide amplification.

If the led has a higher power requirement then it is best to use an npn transistor as a driver. 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. Even fewer parts. The future of lighting.