About LED Voltage Calculator (Formula)
The LED Voltage Calculator is a tool used to determine the appropriate voltage required to power an LED based on its forward voltage and desired current. It aids in designing LED circuits and ensuring proper LED operation. The formula for calculating LED voltage involves considering the LED’s forward voltage and desired current.
Formula for calculating LED voltage:
LED Voltage = Forward Voltage + (Desired Current * LED Resistance)
In this formula, “Forward Voltage” represents the typical voltage drop across the LED (usually specified in datasheets), “Desired Current” represents the desired current flowing through the LED (also usually specified in datasheets), and “LED Resistance” represents the resistance of the current-limiting resistor connected in series with the LED (to limit the current flow).
For example, let’s say an LED has a forward voltage of 2.2 volts and a desired current of 20 milliamperes (mA), and the LED is connected to a current-limiting resistor with a resistance of 100 ohms. The LED voltage would be calculated as follows:
LED Voltage = 2.2 volts + (20 mA * 100 ohms) = 2.2 volts + 2 volts = 4.2 volts
This means that a voltage of approximately 4.2 volts is required to power the LED at the desired current of 20 mA.
The LED Voltage Calculator simplifies the process of determining the appropriate voltage for powering LEDs, aiding in designing LED circuits and ensuring correct LED operation. By inputting the LED’s forward voltage, desired current, and the resistance of the current-limiting resistor, the calculator quickly provides the LED voltage, allowing users to select the appropriate power supply or voltage source for their LED circuit designs.