What is the difference between a constant current (CC) application and a constant voltage (CV) driver application?
Constant-current (CC) designs eliminate the need for limiting resistors or any current limiting devices that consume power and reduce overall efficiency. The driver is required to control the current flow to the LED’s, since LED’s are current driven devices. The LED brightness is proportional to the current flow through the LED.
**Examples of CC applications: LED Luminaires such as downlights, spotlights, accent lighting, LED bulb replacements, etc.
Constant-voltage (CV) designs utilize current limiting resistors or other limiting devices/circuits to control the current to the LED’s. The driver is only required to regulate the voltage to the LED system. This is used in linear type lighting, such as LED strip lighting, rope lighting, etc. That is because there are too many LED’s connected in a string over many feet, which makes CC impossible to implement. Each parallel LED in a strip, requires its own limiting resistor to control the current flow through the LED.