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What is the output of LED driver?
LED drivers provide an interface between the power supply (line) and the LED (load), converting the incoming 50 Hz or 60 Hz AC line power at voltages such as 120 Volts, 220 Volts, 240 Volts, 277 Volts or 480 Volts to the regulated DC output current.
What is a current LED driver?
A current-regulated LED driver is an AC-DC or DC-DC converter with output tailored to the electrical characteristics of the array of LEDs. It provides accurate output current control regardless of the supply-voltage fluctuations and the changes in other operating conditions.
How do constant-current LED drivers work?
A constant current LED driver varies the voltage across the electronic circuit in order to maintain a constant electrical current. This guarantees that no matter the fluctuation in voltage, the current driven to the LED will be maintained at the specified level.
Do LED need a driver?
Because LEDs require a constant DC of 12v or 24v, LED drivers are required in all LED systems (except those which are specifically developed to be controlled by mains voltage power supplies such as mains voltage tape or LED bulbs).
How does a linear LED driver readjust the output?
A linear LED driver converts a higher input voltage to the set operating current of the LED. Due to the voltage difference between the input and output, the linear regulator has a control range to readjust the output when the input voltage fluctuates. So there are no brightness fluctuations of the LED.
How does a constant current driver work on an led?
These drivers vary the voltage along an electronic circuit which allows current to remain constant throughout the LED system. Mean Well’s AP Constant Current Driver is a good example shown below: Higher current ratings do make the LED brighter, but if not regulated, the LED will draw more current than it is rated for.
What kind of drivers are used for LEDs?
Constant voltage drivers are designed for a single direct current (DC) output voltage. Most common constant voltage drivers (or Power Supplies) are 12VDC or 24VDC. An LED light that is rated for constant voltage usually specifies the amount of input voltage it needs to operate correctly.
What are the voltages and currents of LEDs?
So LED drivers usually are sold with a range of voltages and currents. Below is the voltage and current ranges for a popular LED driver. This particular driver (Mean Well HLG-40H) can supply up to 40 Watts. Generally speaking as the voltage of the LED driver increases from 12V to 54V the efficiency improves.