Which is the best circuit for high power LEDs?
High Power LEDs come as bare emitters (as seen in Fig. 1) or mounted to a Metal Core Printed Circuit Board (MCPCB). The boards are insulated and contain conductive tracks for easy circuit connections. Our 20mm 1-Up and 3-Up star board designs are the best sellers.
What happens if there is too much current in a led?
If the voltage supplied to the LED is lower than required, very little current runs through the junction, resulting in low light and poor performance. On the other hand, if the voltage is too great, too much current flows to the LED and it can overheat and be severely damaged or fail completely (thermal runaway).
What’s the efficiency of Cree XLamp XP-L led?
This is great efficacy but also note Cree boasts that the XLamp XP-L LED has breakthrough efficacy of 200 lumens/watt running at 350mA. It is good to know that the efficacy goes down as you run more current to the LED as this increases heat which does make the LED a bit less efficient.
What does led stand for in electrical category?
Basically an LED is an electrical component that emits light when electricity flows through in one direction, from the Anode (positive side) to the Cathode (negative side). LED is an acronym standing for ‘ L ight E mitting D iode’.
Why do I need a constant current LED driver?
In the beginning, we mentioned using a constant current LED driver because these power modules can vary their output voltages to match the series circuit. As LEDs heat up their forward voltages change, so it’s important to use a driver that can vary its output voltage, but keep the same output current.
What’s the minimum voltage for a series led?
The sum of three of these LED forward voltages is equal to 8.85V dc. So theoretically, 8.85V is the minimum required input voltage to drive this circuit. In the beginning, we mentioned using a constant current LED driver because these power modules can vary their output voltages to match the series circuit.
How many LEDs can you run in a parallel circuit?
Rule number 2 from the series circuit bullet points proves that 12V dc isn’t enough voltage to run all 9 LEDs in-series (9 x 2.98= 26.82V dc ). However, 12V dc is enough to run three in-series (3 x 2.98= 8.94V dc ). And, from the parallel circuit rule number 3 we know that total current output gets divided by the number of parallel strings.