An LED driver is an electrical device that regulates power to an LED or a string of LEDs. It is a crucial piece to an LED circuit and to operate without one will result in system failure.
In electronics, an LED driver is an electrical circuit used to power a light-emitting diode (LED). The LED driver must provide sufficient current to light the LED at the required brightness, but must limit the current to prevent damaging the LED. The voltage drop across an LED is approximately constant over a wide range of operating current; therefore, a small increase in applied voltage greatly increases the current. Very simple circuits are used for low-power indicator LEDs. More complex, current source circuits are required when driving high-power LEDs for illumination to achieve correct current regulation.
Below is how to consider before selecting an LED driver
1. What type of LEDs are being used and how many?
2. Find out forward voltage, recommended driving current, etc.
3. Do I need a constant current LED driver or a constant voltage LED driver?
4. We go over constant current vs. constant voltage here.
5. What type of power will be used? (DC, AC, batteries, etc.)
6. Running from AC? See how an AC driver will benefit you!
7. What are the space limitations?
8. Working in a tight area? Not a lot of voltage to work with?
9. What are the main goals of the application?
10. Size, cost, efficiency, performance, etc.
11. Any special features needed? Dimming, pulsing, microprocessor control, etc.
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