1. What is the LED Series Voltage Equation?

The LED series voltage equation calculates the total voltage required for a constant current LED string. It helps determine the appropriate power supply voltage needed for a given number of LEDs in series.

2. How Does the Calculator Work?

The calculator uses the LED series voltage equation:

Where:

• \( V_{total} \) — Total voltage required (volts, V)
• \( n \) — Number of LEDs in series (unitless)
• \( V_f \) — Forward voltage of each LED (volts, V)

Explanation: The equation simply multiplies the number of LEDs by their forward voltage to determine the minimum voltage required to power the series string.

3. Importance of Voltage Calculation

Details: Proper voltage calculation ensures your power supply can adequately drive the LED string without overvoltage (which could damage LEDs) or undervoltage (which would result in dim or non-functional LEDs).

4. Using the Calculator

Tips: Enter the number of LEDs in your series string and the forward voltage of each LED (typically found in the LED datasheet). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What if my LEDs have different forward voltages?
A: This calculator assumes all LEDs in the string are identical. For mixed LEDs, calculate each segment separately and sum the voltages.

Q2: How much extra voltage should my power supply provide?
A: Typically add 10-20% to the calculated voltage to account for voltage drops and regulation needs.

Q3: Does this work for parallel LED strings?
A: No, this calculates voltage for series strings only. Parallel strings require current calculations instead.

Q4: What about the current limiting resistor?
A: This calculator doesn't account for current limiting resistors needed with voltage sources. For constant current drivers, resistors aren't needed.

Q5: Can I use this for high-power LEDs?
A: Yes, the same principle applies regardless of LED power, but ensure your power supply can handle the current requirements.