When Do I Need a Constant-voltage” LED Driver?

Most commercially available LED “light modules” are constructed by connecting a number of LEDs in series orinparallel to form cluster or string configurations. In cases where these lights modules include a constant-current driver as part of the assembly, an external “constant-voltage” driver or power supply is required.

Low cost LED circuits control the current flowing through the LED with a simple resistor. This is another case where a constant-voltage power source is required. Other examples where constant voltage supplies have been employed include ads signs, traffic information signs and large screen high definition LED displays.

Constant-voltage drivers come in many different forms. They can look like a conventional power supply or they can be enclosed for moisture and environmental protection.

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