How do you drive high current LEDs?
The most efficient way to drive high-current LEDs is to use a DC-DC converter with current feedback. DC-DC converters are efficient power-conversion circuits that use passive, low-pass LC filters to smooth out switching action into constant voltages.
What frequency do LED lights emit?
between 400 and 600 THz
What about LED lights? LED bulbs emit an electromagnetic field that works on the frequency between 400 and 600 THz. This is a much higher frequency than almost any household appliance.
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.
How is the frequency of an LED driver determined?
The frequency of a switched LED driver is high enough that average power, not instantaneous power, should be used to determine maximum drive current. The limiting factor which determines maximum current at any duty cycle is average power dissipation.
Why are LEDs used for high power lighting?
High power LEDs used for lighting are pushing limits in a different way and exhibit more falloff with higher current. Maximum efficiency and maximum brightness are not the same thing. This difference is enough to matter in demanding applications. This is where you have to check the LED datasheet carefully.
What happens when the current of an LED is increased?
Firstly, human perception at constant power and variable duty cycle pulses. A say 10% duty cycle would result in 10 x the current at the same voltage for this to hold. Real LEDs will have somewhat higher forward voltages when current is increased by 10x but not greatly so. A fair test is probably Ipeak x time on = constant.