constant current led driver dimmable

In the example above we would still be alright driving the XP-G2 LED at 700mA, however, if you didn’t have a current limiting device, the LED would draw more current as it’s electrical characteristics changed due to temperature increase.

So if you see that your strip takes 12VDC, don’t worry about a constant current driver, all you will need is a 12VDC constant voltage source as the current is already being regulated by on board circuitry that the manufacturer has built in.So when you’re building your own fixture or working with our You use a constant voltage LED driver only when using an LED or array that has been specified to take a certain voltage. An LED light that is rated for constant voltage usually specifies the amount of input voltage it needs to operate correctly.A constant voltage power supply receives standard line voltage (120-277VAC). Most often, constant voltage drivers are implemented in under-cabinet lights and other If you take a look at high powered LEDs, one unique characteristic is the exponential relationship between the applied forward voltage to the LED and the current flowing through it. We call this thermal runaway which is explained in more detail The above example is with high powered LEDs and on a smaller scale as we only talked of using one LED. These drivers vary the voltage along an electronic circuit which allows current to remain constant throughout the LED system. Higher current ratings do make the LED brighter, but if not regulated, the LED will draw more current than it is rated for.

This is helpful as:Marketing and technology enthusiast helping pave the way to a more energy efficient society. Fortunately for lighting designers, manufacturers have introduced many LED products to the market that have multiple LEDs already assembled together like LED rope light, LED strips, LED bars, etc.The most common LED strips are designed with a group of LEDs in series with a current-limiting resistor in line with them. LED drivers are the driving force that provides and regulates the necessary power to make sure the LEDs operate in a safe and consistent manner. LEDs that are rated to operate on a constant current driver require a designated supply of current usually specified in milliamps (mA) or amps (A). Understanding the difference between the two types can: When the LED is turned on, even the smallest 5% change in voltage (2.74V to 2.87V) can create a 100% increase in current driven to the XP-G2 as you can see at the red marks current went from 350mA to 700mA.Now higher current does make the LED brighter, but it also will eventually over-drive the LED. See Figure 2 for Cree’s specifications of the maximum forward current and the de-rating curves in different ambient temperature conditions. With lighting in the real world, it isn’t convenient or economical to build everything by hand from a single diode, LEDs are usually used together in series and/or parallel circuits to create the desired outcome.

Constant current and Constant voltage drivers are both viable options for a power supply for LED light sources, what differs is the way in which they deliver the power.

Living in the beautiful state of Vermont and working for a company like LEDSupply that is helping provide LED products to save on energy is a great place to be in accomplishing this. A constant current driver is the best way to drive high power LEDs as it maintains a consistent brightness across all LEDs in-series.Constant voltage drivers are designed for a single direct current (DC) output voltage. Constant current and Constant voltage drivers are both viable options for a power supply for LED light sources, what differs is the way in which they deliver the power. Most common constant voltage drivers (or Power Supplies) are 12VDC or 24VDC. The manufacturers make sure the resistors are of the right value and in the right position so that the LEDs on the strips will be less prone to the variation of the voltage source as we talked of with the XP-G2. The driver will always maintain a constant voltage no matter what kind of current load is put on it. You can see this clearly from the electrical characteristics of the Cree XP-G2 below in Figure 1. This would eventually push the current way above the limit…especially in hotter environments.

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