Types of LED Drivers

There are two main types of LED drivers: constant voltage and constant current. Each type is designed to operate LEDs with different electrical requirements. If you’re replacing a driver, be sure to match the old driver’s input and output requirements as closely as possible.
Constant Voltage LED Drivers
On the other hand, constant voltage drivers are designed for LEDs that require a fixed output voltage with a maximum output current. LED lights that operate with a constant voltage driver require a consistent amount of output voltage, typically 12V DC or 24V DC. This type of driver receives a standard voltage, around 120-277 Volts in the form of alternating current voltage (VAC) which the driver converts to a low direct current voltage (VDC). These drivers will maintain a constant voltage as long as the current stays below its maximum amperage rating. Constant voltage applications include under cabinet lights, under stair lighting, strip lights, and rope lights.
Constant Current LED Drivers
Constant current drivers are designed for LED lights that require a fixed output current and a ranged output voltages. This type of driver will have one specified output current labeled in amps and a range of voltages that will vary depending on the wattage rating of the LED. Using a higher amp rate will make the LED brighter; however, it will eventually over-drive the LED which results in reduced life-span and premature failure. Since constant current drivers maintain a consistent brightness, they are often used for signs, back-lighting, and commercial LED displays.