Constant voltage power supplies provide a stable regulated voltage; this means that the output voltage will remain constant regardless of the varying AC input. During operation the output voltage will be regulated to within voltage tolerance which normally stands at 1-2%.

Constant current on the other hand provides a stable output current whilst the voltage can vary.Tbwtekconstant current LED power supply range possesses both constant voltage and constant current characteristics. TbwtekConstant current drivers operate at start up in constant voltage mode. Once the output current rated load is exceeded and it reaches the constant current region the LED driver will operate in constant current mode. This type of operation allows for direct drive of LEDs and can allow a more flexible system design.