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What input voltage do I need to power x LEDs connected in series with a BuckPuck or PowerPuck driver?

Last Updated: Aug 24, 2012 08:16AM MDT

You can calculate the input voltage that you will need using the following formula:

Vt + (Vf x LEDn) = Vin

Vt 2 if you are using a DC BuckPuck or PowerPuck driver, or 4 if you are using an AC BuckPuck driver.
Vf The maximum forward voltage rating of the LEDs you are powering.
LEDn  The number of LEDs you want to power.
Vin The input voltage to the driver.

For example, if you need to power 6 LXML-PWC1-0100 LEDs from a DC power source, then Vin would need to be at least 26VDC based on the following calculation:

2 + (3.99 x 6) = 25.94

Remember that the Vf rating of an LED provided in the technical documentation is the typical rating. For example, the typical Vf for the LXML-PWC1-0100 is 3.15. To ensure that your input voltage is high enough to power the LEDs if the LEDs you are powering happen to have the maximum Vf rating, you should always use the maximum Vf rating of the LED in your calculation. In the case of the LXML-PWC1-0100, this would be 3.99.

If you are using an AC BuckPuck driver, then be sure to use 4 in your formula.

This formula determines the minimum input voltage you need to provide to the driver. There is no harm in using a higher voltage up to the maximum input voltage rating of the driver. (32V for DC drivers and 28V for AC drivers.)

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