# What is the forward voltage of white LED?

## What is the forward voltage of white LED?

3V to 5V
The typical forward voltage of a white LED is in the range of 3V to 5V. Since the best choice to power white LEDs is a constant current source and the input voltage range of a Li-Ion battery is below or equal to the LED forward voltage a new power supply solution is required.

### How do you determine the forward voltage of an LED?

Lower the resistance until the current is up to 20 mA and record the voltage and current. The forward current of the blue LED was 3.356 V at 19.5 mA. If you are powering it with 3.6 V, the resistor value to use is the next higher value for R=(3.6V-3.356V)/0.0195A)=12.5 ohm.

How much current does a white LED draw?

The data sheet says 3.35 V at 30 mA. That does not mean it must only be used at that voltage and current. Attached is a chart of a white LED at various currents. Somewhere around reading 55 is the “rated” value.

What is the forwarding voltage and current of an LED?

Types of Light Emitting Diode Most common LED’s require a forward operating voltage of between approximately 1.2 to 3.6 volts with a forward current rating of about 10 to 30 mA, with 12 to 20 mA being the most common range.

## Why do LEDs have different forward voltages?

The forward voltage rating has to be met in order to light the LED, and that rating varies according to the LED color. The reason for this is that to produce different colors, different materials are used in the semiconductor portion of the LED.

### What is the highest forward voltage applied for which LED remains dark?

Standard red, green, and yellow LEDs have forward voltages in the range 1.4V to 2.6V, depending on the desired brightness and the choice of forward current. For forward currents below 10mA, the forward voltage varies only a few hundreds of millivolts.

What is the maximum voltage a LED can withstand?

LED V/I characteristics

Characteristics Unit Maximum
Forward voltage (@350mA, 85°C) V 3.48

Will low voltage damage LED lights?

As we mention above, under-driving LED strips by using a lower voltage than its rated voltage is completely safe and has no detrimental effects on the LEDs or the circuitry.

## What is forward current in LED?

Forward current (If) of a diode is the maximum safe current you can continuously pass through the device without causing it damage. The circuit is expected to limit the current through the device to this amount if there will be no pauses in the current (100% duty cycle).

### How many volts do LEDs need?

2-3 volts
LEDs often require a certain amount of volts, depending on the type and color of the LED. Most experts recommend 2-3 volts for LEDs. However, you can look it up to be certain. This article explains what happens if you put too much voltage through an LED and how to prevent such a situation.

Why do LEDs have different forward voltage?

What is the maximum voltage for LED?

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