Constant Current LED Driver Vs. Constant Voltage LED Driver

Constant Current LED Driver vs. Constant Voltage LED Driver

First, let us discuss what exactly a constant current driver is versus a constant voltage driver. A constant current power supply varies the voltage across an electronic circuit allowing the device to maintain a constant electric current. This thus ensures that, no matter the variation in voltage, the current delivered to LEDs does not change.  In contrast to constant current power supplies, constant voltage drivers have a fixed voltage of 12VDC or 24VDC supplied to the circuit. Knowing these differences, however, and the fact that LEDs are considered constant current driven devices, how does one then decided between a constant current driver and a constant voltage driver for one’s application?

Constant Current LED Power Supply

For many LED applications, it is desirable to utilize constant current drivers. Constant current LED drivers are ideal in that they offer designers more control for applications, providing them with the ability to design displays with almost no variation in brightness across the display.