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You can calculate the number of series-connected LEDs you can power with a single BuckPuck or PowerPuck driver using the following formula:
Number of LEDs = (Vin – Vt) / Vf
Where:
Vin = The input voltage to the driver
Vt = Voltage threshold of the driver (2V for DC BuckPuck or PowerPuck drivers)
Vf = Maximum Forward Voltage rating of the LEDs you are powering
Example Calculation
Let’s say you have:
- A 12V DC power supply
- LXML-PWC2 LEDs with a maximum Vf of 3.25V
- A DC BuckPuck driver
The calculation would be:
(12V – 2V) / 3.25V = 3.07
Rounding down, you can power 3 LXML-PWC2 LEDs in series with a single driver.
Important Considerations
- Always use the maximum Vf rating: The Vf rating provided in LED technical documentation is typically the average value. Always use the maximum Vf rating in your calculations to ensure your setup works with all LEDs, including those at the high end of the tolerance range.
- Margin of safety: It’s a good practice to leave some headroom in your calculations to account for variations in supply voltage and LED characteristics.
- Current limitations: Ensure that the total current draw of your LEDs doesn’t exceed the driver’s maximum current rating.
- Heat management: Consider the heat generated by your LED setup and ensure proper thermal management, especially when approaching the driver’s limits.
By following these guidelines, you can accurately determine the number of LEDs you can safely power with your Buck/PowerPuck driver.
