What are CV, CC, and CV+CC in LED Power Supply Specification

When you wanna to buy a LED Power Supply, you have to know CV (Constant Voltage), CC (Constant  Current ), or CV + CC system. But what are CV, CC, and CV+CC in LED power supply specification.

C.V, also called Constant Voltge, conventional power supply provides stable regulated voltage (constant voltage) for load usage. Regardless of AC input variation (90 ~ 264 VAC) or load variation, output voltage is regulated to within voltage tolerance specification (single output unit typically 1~2%). For example, when LPV-60-12 is used for powering LED driver + LED Strips, the output voltage keeps at 12V.

CC, also called Constant Current, designed to provide stable output current (constant current); the output voltage is determined by LED total Vf. For example, using 12pcs LED with Vf+3.5V@350mA connected in series, the total Vf will be 3.5V*12=42V. With 2 strips connected in paralle, the total If=350mA*2=700mA. If MW constant current LED power supply LPC-35-700 (Vin=90~264VAC, Vout=48V/700mA) is used to drive LED load directly, LED power supply will work in CC mode. The output voltage will drop to 42VDC while output current remains constant at 700mA.

CV + CC, also called Constant Voltge + Constant Current. Mean Well LED power supply possesser both "C.V+C.C." characteristics. During startup it will operate in"C.V.mode",which is suitable for LED driver IC and seristor applications. Once output current requirement exceeds rated current of the power supply and reaches the constant current region, the unit will remain in the constant current mode which is suitable for dirve of LEDs. C.V.+C.C. characteristics can be used in all types of LEDsetup making system design more flexible.