What is the typical forward voltage of an LED?
Typically, the forward voltage of an LED is between 1.8 and 3.3 volts. It varies by the color of the LED. A red LED typically drops around 1.7 to 2.0 volts, but since both voltage drop and light frequency increase with band gap, a blue LED may drop around 3 to 3.3 volts.
What is maximum voltage for LED?
LED V/I characteristics
| Characteristics | Unit | Maximum |
|---|---|---|
| Forward voltage (@350mA, 85°C) | V | 3.48 |
What does max forward voltage mean?
Maximum forward voltage = VF, usually specified at the diode’s rated forward current. In reality, the forward voltage is described by the “diode equation.” Maximum (average) forward current = IF(AV), the maximum average amount of current the diode is able to conduct in forward bias mode.
What’s the difference between typical and maximum forward voltage for?
To some degree the ‘typical’ forward voltage is at a typical safe drive current, while maximum forward voltage could be the peak pulsed current the LED can handle, but not have a long life. I buy 5mm round high-efficiency pure white LED’s that put out 1 watt of light while consuming about 1/9th watt of power.
What should the voltage of a led be?
Typical V LED values are 1.7V for non-high-brightness red, 1.9V for high-brightness high-efficiency low-current red, 2V for orange and yellow, 2.1V for green, and 3.4 to 3.6V for bright white and most blue types. In order to make sure that this voltage gets dropped across the LED, you should use a voltage greater than the LED’s forward voltage.
What’s the forward voltage of a red LED?
What you should find is that red, green, or yellow LEDs have relatively low forward voltage ranging from 1.6-2.2V. However, blue and white LEDs can begin conducting from 2.5-4V.
Where does the wattage of a 1 watt LED come from?
At the maximum drive current of 1000mA (1A) the forward voltage is 3.9V f, this is where the 3.9W number came from. And, at the other end, the 0.3W number came from a forward voltage of 3.0V f volts at 100mA (0.1A). So here you can see the wattage depends on the drive current.