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To determine the input voltage needed to power one or more series-connected LED modules using a BuckPuck or PowerPuck driver, use the following formula:
Vin = Vt + (Vf x LEDn)
Where:
- Vin = Required input voltage to the driver
- Vt = Threshold Voltage (2.5V for BuckPuck & 2.0V for PowerPuck drivers)
- Vf = Maximum Forward Voltage rating of the LEDs
- LEDn = Number of LEDs in the series
Important Considerations
- Always use the Maximum Vf rating of the LED from the datasheet, not the typical rating.
- The formula provides the minimum required input voltage. Any voltage from the minimum up to the driver’s maximum input voltage rating can be used.
BuckPuck Driver Example
To power 6 series-connected LXML-PWC2 LEDs with a BuckPuck driver:
- Vt = 2.5V (DC driver threshold)
- Vf = 3.25V (max rating for LXML-PWC2)
- LEDn = 6
Vin = 2.5 + (3.25 x 6) = 22V
Therefore, you need at least a 22 VDC power source.
