A constant voltage (CV) LED driver is an AC-DC power supply or a DC-DC converter that provides a fixed output voltage, typically 12 volts or 24 volts, rather than a constant current. Constant voltage LED drivers are designed to operate lighting systems which have multiple LED modules connected in parallel.
Don't be confused by those "constant voltage vs. constant current LED drivers" comparisons. All LEDs are current driven, and only with a constant current input can LEDs provide consistent, non-flickering illumination. A constant current LED driver provides a regulated current that can be used to drive an LED or an LED module directly, whereas a constant voltage LED driver, strictly speaking, is not an LED driver because it does not provide regulated output that a current-sensitive LED or LED module can operate with. Therefore, a CV LED driver is basically a power supply that provides semi-processed power with only the voltage being regulated to a constant level. The load it supplies to an LED or LED module needs to be further regulated in order to match the electrical current requirement of the diode(s).
