Electronic Components
LED Series String Calculator
Use LED Series String to the lEDs per string calculation. The loaded example shows the arithmetic with practical electrical units.
Enter values for lEDs per string
Use one consistent electrical operating case for all fields.
How LED Series String works
For LED Series String, use count = available voltage ÷ forward voltage. LED Series String uses Available LED voltage, Forward voltage per LED to report LEDs per string.
With the loaded values, lEDs per string evaluates to 7.00 LEDs. Test available led voltage separately and preserve the baseline leds per string. If the next question concerns equivalent inductance, open Series Inductor Calculator.
Inputs for LED Series String
Available LED voltage and Forward voltage per LED belong to LED Series String. Keep source units with available led voltage.
The LED Series String defaults demonstrate arithmetic only. Replace available led voltage with case-specific data. Compare this result with RC Snubber Calculator when snubber time constant is also needed.
- Available LED voltage
- Example entry: 21 V.
- Forward voltage per LED
- Example entry: 3 V.
Reading the LED Series String result
This output represents LED Series String.
Before selecting equipment for LED Series String, compare leds per string with available ratings and operating limits.
Measurement and units
Use component tolerances, voltage ratings, current limits, frequency behavior, and thermal data from the selected parts. Check prefixes on available led voltage.
Keep the available led voltage unit and measurement point consistent across LED Series String cases.
Limits of this calculation
Reserve voltage for current regulation. Use MOSFET Conduction Loss Calculator as the follow-up for conduction loss.
Only the listed LED Series String inputs contribute to leds per string. Unentered effects remain outside LED Series String.
A useful LED Series String comparison
Save the initial lEDs per string before adjusting available LED voltage. A low and high case is more informative than adding an unexplained safety factor after the calculation.
Document the alternate available led voltage source.
LED Series String record notes
Record source and operating details for available led voltage.
Retain raw leds per string beside its selected rating.
Questions about LED Series String
What does LED Series String calculate?
It evaluates lEDs per string from available LED voltage and forward voltage per LED using the displayed formula.
Can Available LED voltage be zero?
For LED Series String, measure any zero available led voltage directly.
Why can leds per string differ from measurement?
Reserve voltage for current regulation. Recheck available led voltage.
Should the result be rounded?
Keep extra digits while comparing cases, then round to the precision supported by available LED voltage.